Mercedes-Benz, Luxury Automobiles, German Engineering, Premium Car Brand, Mercedes Innovation
Wednesday, June 30, 2021
Nissan GT-R First Look Review
SUV Review: 2021 GMC Terrain SLE Missing features and a bland interior are solid hints that GMC's compact crossover is due for its 2022 refresh
2010 Cadillac Truck SRX AWD V6-3.0L Page 1736
2010 Cadillac Truck SRX AWD V6-3.0L Page 1736
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0776
- Clutch Pressure Control (PC) Solenoid 2 - Stuck Off
DTC P0777
- Clutch Pressure Control (PC) Solenoid 2 - Stuck On
Circuit/System Description
The clutch pressure control (PC) solenoid 2 is part of the control solenoid valve assembly, which has no serviceable components. The PC solenoid
2 regulates transmission fluid pressure to the 3-5-Reverse clutch regulator valve which controls pressure to the 3-5-Reverse clutch. The
transmission control module (TCM) calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor
(OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.
Conditions for Running the DTC
P0776
* No ISS DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206,
P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E.
* The ignition voltage is greater than 8.6 volts.
* The engine speed is greater than 400 RPM for 5 seconds.
* The transmission fluid temperature is 0掳C (32掳F) or greater.
* The transmission output speed is 16 RPM or greater, or the throttle position is 0.4 percent or greater.
* The throttle position signal is valid.
* The high side driver is commanded ON.
P0777
* No DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207,
P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or P182E.
* The transmission fluid temperature is 0掳C (32掳F) or greater.
* The transmission output shaft speed is 350 RPM or greater.
* The transmission input speed is 200 RPM or greater.
* The commanded gear is not 1st range.
* The high side driver is enabled.
Conditions for Setting the DTC
P0776
The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the 3-5-R clutch is commanded ON for 3 seconds and the transmission
input shaft speed is 200 RPM or greater from the anticipated input shaft speed.
P0777
The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 3-5-R clutch is commanded OFF for 1.2 seconds and the transmission
input shaft speed is 40 RPM or less from the anticipated input shaft speed.
Action Taken When the DTC Sets
P0776
* DTC P0776 is a Type A DTC.
* The TCM commands maximum line pressure.
* The TCM inhibits Tap Up/Down function.
* The TCM freezes transmission adaptive functions.
* The TCM inhibits manual shifting of forward gears.
* The TCM limits the transmission to 2nd, 4th, or reverse operation.
P0777
* DTC P0777 is a Type A DTC.
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2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 3183
YES
Test sequence
- Unplug connector 8 at control unit N93 (Central gateway control unit).
- Measurement at connector 8
- Measure direct voltage with multimeter between sockets (N93) 8.1 and (N93) 8.6
Specified value
- Voltage[11.0...14.5] V
Question
- Is the measurement value OK?
YES
The measurement value is OK.Restore original status.
- Plug in the connector 8 at component N93 (Central gateway control unit).
- Switch on ignition.
End of test
NO
The measurement value is not OK.Possible cause and remedy in the case of undervoltage
- Lines between N93 (Central gateway control unit) and
- Lines between N93 (Central gateway control unit) and
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Lines between and
- G1 (Battery)
- G2 (generator)
End of test
1.3.2.1.10. Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).
Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence
- Switch off ignition.
- Separate plug connection at transmission.
- Measure voltage in transmission wiring harness using a multimeter.
- Switch on ignition.
Measure direct voltage with multimeter between 5 and 4Specified value:
2010 Cadillac Truck SRX FWD V6-3.0L Page 629
2010 Cadillac Truck SRX FWD V6-3.0L Page 629
1. Ignition OFF, disconnect the harness connector at the T10J center console front keyless entry antenna.
2. Ignition ON, test for less than 1 V between the signal circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry
control module.
3. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX
function.
4. Activate the antenna by pressing the ignition mode switch. Verify the MAX voltage captured by the DMM is OL or is greater than.5 V.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K84 keyless entry control module.
5. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the
MIN MAX function.
6. Activate the antenna by pressing the rear closure touch pad. Verify the MAX voltage captured by the DMM is greater than.5 V.
瀚慖f less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K84
keyless entry control module.
7. If all circuits test normal, replace the T10J center console front keyless entry antenna. Verify DTC B3122 is not set.
瀚慖f the DTC is set, replace the K84 keyless entry control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Ignition Lock Key Transmitter Antenna Replacement - Instrument Panel (See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Keyless Entry/Antenna - Keyless Entry/Service and Repair/Ignition Lock Key Transmitter Antenna Replacement - Instrument Panel
)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for keyless entry control module replacement, setup,
and programming
B3123
DTC B3123
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptors
DTC B3123 02
- Keyless Entry Antenna 5 Short to Ground
DTC B3123 05
- Keyless Entry Antenna 5 High Voltage/Open
Diagnostic Fault Information
Circuit/System Description
The rear center console antenna is located in rear of the center console assembly and is used to establish low frequency communications with the
keyless entry transmitter. When the driver attempts to change the ignition status of the vehicle, the keyless entry control module communicates with
the rear center console antenna.
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2010 Cadillac Truck SRX AWD V6-3.0L Page 2128
2010 Cadillac Truck SRX AWD V6-3.0L Page 2128
- Brake Band Pressure Control Solenoid Valve Control Circuit Low Voltage
DTC P2730
- Brake Band Pressure Control Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The shift control solenoid (SLB1) is installed on the front valve body. The solenoid linearly controls hydraulic pressure in response to signals
output from the transmission control module TCM. Through this, the SLB1 controls operating hydraulic pressure to the brake for smooth shifting.
According to each shift control solenoid assembly, the transmission shifts from 1st gear into 6th gear and vice versa. As a fail-safe function, if any
shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.
Conditions for Running the DTC
P2725
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTCs P2729 and P2730 are not set.
P2728
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* The automatic transmission fluid temperature is more than 20掳C (68掳F).
* SLB1 current is more than 0.85 A.
* SLB1 current is not changed.
P2729
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTC P2730 is not set.
P2730
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTC P2729 is not set.
Conditions for Setting the DTC
Six (!) as-new 1993 Chevrolet Camaro Pace Car Editions up for grabs
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via https://youtu.be/Bv7OwFiGgVg
2021 BMW 4 Series Review | If you get past the nose ...
Continue reading 2021 BMW 4 Series Review | If you get past the nose ...
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Why are Hyundai engines failing?
2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 2984
1.3.2.1.5. No further information available.
1.3.2.1.6. Check power supply at control unit A1 (Instrument cluster).
1.3.2.1.6. No further information available.
1.3.2.1.7. Check power supply at control unit N80 (Steering column module).
Test 1.3.2.1.7.1: Inspect control unit N80 (Steering column module) for undervoltage fault.
Test 1.3.2.1.7.2: Test voltage supply of circuit 30 by means of actual value.
Test 1.3.2.1.7.3: Test voltage supply of circuit 30 by means of measured value.
Test 1.3.2.1.7.4: Check the CAN communication with control unit Engine control module.
Test 1.3.2.1.7.5: Engine compartment CAN test
1.3.2.1.7.1. Inspect control unit N80 (Steering column module) for undervoltage fault.
If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if
necessary.Question:Is the fault current in several control modules?Note:This fault could result in consequential faults. You should therefore process
this fault first and then erase the fault memory.
YES
Possible cause and remedy
- Battery voltage too low.Test battery.Charge battery, replace if necessary.
- If fault occurs again:Check alternator.Communication with ECU required
- The quiescent current is too high.Test quiescent current.
NO
Manual check of supply voltage
Test prerequisite
- Fuse F34f33 (Fuse 33) in component F34 (Interior fuse box) is o.k.
- Actual value is not okay or there is a complaint.
Status of relevant actual value:
- Voltage at terminal 30:Warning! Communication with ECU required.
Test sequence
- Switch off ignition.
- Remove component Airbag.
- Please refer to WIS document AR91.60-P-0660.
- Remove component Multifunction steering wheel.
- Please refer to WIS document AR46.10-P-0100.
- Remove component A45 (Clock spring contact).
- Please refer to WIS document AR46.10-P-0200.
- This information can be shown using the help function (F6 button) in menu item 'Testing and repair work'.
- Measure direct voltage with multimeter between sockets [N80] 1.8 and [N80] 1.9
Specified value
- Voltage [11.0...14.5] V
Question
- Is the measurement value OK?
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Permalink | Email this | Comments2010 Cadillac Truck SRX AWD V6-3.0L Page 1917
2010 Cadillac Truck SRX AWD V6-3.0L Page 1917
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool ECM - Fuel Level Sensor parameters. The reading should be between 0.5-3.5 V and vary with fuel level.
2. Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that the fuel level gauge sweeps from its low to high
position
瀚慖f the fuel level gauge does not sweep, replace the P16 Instrument Cluster.
3. Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
瀚慖f the low fuel level indicator always stays on or always off, replace the P16 Instrument Cluster.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate fuel level sensor.
2. Test for less than 30 ohm at the low reference circuit terminal C.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20
Engine Control Module.
3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal D and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control
Module.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K20 Engine Control Module.
4. If all circuits test normal, replace the appropriate fuel level sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Primary Fuel Level Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Level Sensor/Service and
Repair)
* Secondary Fuel Tank Module Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Tank Unit/Service and
Repair/Secondary Fuel Tank Module Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the ECM replacement, programming and setup
P2067
DTC P0461-P0464, P2066, P2067, or P2068
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
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2010 Cadillac Truck SRX FWD V6-3.0L Page 424
2010 Cadillac Truck SRX FWD V6-3.0L Page 424
Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information
Bus/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool References
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify DTC B1001 is not set.
If the DTC is set, program the control module. If the DTC resets, replace the control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for control module replacement, setup, and programming
Supplemental Inflatable Restraints
DTC B1001
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category
DTC Descriptor
DTC B1001 00
- Option Configuration
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) stores a primary data key, which is a 4-digit number. When the ignition is turned ON,
the SDM compares this information to the information stored in the body control module (BCM) over the serial data communication circuit. If there
is a mismatch between the information stored in the SDM and BCM, DTC B1001 will set.
Conditions for Running the DTC
System voltage is between 9-16 V.
Conditions for Setting the DTC
The 4-digit Primary Data Key stored in the SDM does not match the 4 digits stored in the BCM.
Action Taken When the DTC Sets
2022 Toytoa VOXY Overview Specification & Presentation
2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1622
2.1.3.4.1.8. Steering column module
Warning!Communication with ECU required.
3. Chassis CAN bus
Warning!Communication with ECU required.
4. CAN communication is faulty.
Test 4.1: Check the CAN communication with control unit N93 (Central gateway control unit).
4.1. Check the CAN communication with control unit N93 (Central gateway control unit).
Test 4.1.1: Check the CAN communication with control unit.
4.1.1. Check the CAN communication with control unit.
Warning!Communication with ECU required.
E1297
This fault can be ignored and erased.
Possible cause:
- This fault can be ignored and erased.
Affected functions:
- Transfer case
-------------------------------------------------
Test 1: This fault can be ignored and erased.
1. This fault can be ignored and erased.
Note:This fault can be ignored and erased.
Part 1
Fault or disturbance in CAN message from control unit Traction systems
Possible cause:
- Drive train CAN bus
Affected functions:
- CAN Communication
-------------------------------------------------
Test 1: Engine compartment CAN test
1. Engine compartment CAN test
Test 1.1: Engine compartment CAN test
1.1. Engine compartment CAN test
Test 1.1.1: Procedure in case of CAN faults
Test 1.1.2: Read current CAN configuration and CAN fault codes
Test 1.1.3: Further CAN test options
2010 Cadillac Truck SRX AWD V6-3.0L Page 1745
2010 Cadillac Truck SRX AWD V6-3.0L Page 1745
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ensure the transmission fluid temperature is between 50-80掳C (122-176掳F).
2. Operate the vehicle in 2nd gear long enough to ensure at least a 3掳C (5掳F) rise in transmission fluid temperature, then operate the vehicle in
Park for 5 s.
3. Observe the scan tool Clutch Pressure Control Solenoid Valve 1 Current parameter, the reading should be between 0.1-1.1 A.
Circuit/System Testing
Command the Clutch Pressure Control Solenoid Valve 1 with a scan tool. The value should change from 0.0-1.0 A.
If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module. Connect a test lamp between the low reference
circuit terminal 10 X2 at the K71 Transmission Control Module and the voltage supply component circuit terminal 11 X2 at the K71 Transmission
Control Module. Command the Clutch Pressure Control Solenoid Valve 1 with a scan tool. The test lamp has to illuminate brighter with increasing
current.
If the test lamp always illuminate or always does not illuminate, replace the K71 Transmission Control Module.
Component Testing
Static Test
1. Ignition OFF, remove the K71 Transmission Control Module.
2. Test for 5-5.6 ohm at 20掳C (68掳F) between the low reference circuit terminal 10 X2 and the voltage supply circuit terminal 11 X2.
瀚慖f less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27A Pressure Control
Solenoid Valve 1.
3. Test for infinite resistance between each terminal and the low reference circuit terminal 10 X2 and also to the voltage supply circuit terminal
11 X2.
瀚慖f less than the specified range, replace the wiring harness.
4. If all circuit test normal, perform the Control Solenoid Valve Inspection (M36 and MXE) (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/AF40-6 - Automatic Transmission).
瀚慖f the inspection test normal, replace the control valve body.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control valve body replacement-Refer to Control Valve Body Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Valve Body/Service and Repair/AF40-6 - Automatic Transmission/Control Valve Body Replacement) for
replacement, setup and programming.
* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for replacement, setup and
programming.
* Perform the Transmission Adaptive Functions (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and
Operation/AF40-6 - Automatic Transmission/Transmission Adaptive Functions).
* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Wiring Harness/Service and Repair) for replacement.
P0780
DTC P0780
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
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2010 Cadillac Truck SRX FWD V6-3.0L Page 470
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the KR70 RAP/ACCY relay.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ohms
between the ground control circuit terminal 86 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 87and ground.
瀚慖f the test does not illuminate, test the B+ circuit for short to ground or an open/high resistance.
4. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
5. Command the RAP/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
command states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
6. Connect the RAP/ACCY relay. Disconnect the harness connector at the center console accessory power outlet.
7. Connect a test lamp between the ignition circuit terminal A and ground.
8. Command the RAP/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the
command states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR70
RAP/ACCY relay.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or
replace the KR70 RAP/ACCY relay.
Component Testing
1. Ignition OFF, disconnect the KR70 RAP/ACCY relay.
2. Test for 70-150 Ohms between terminals control circuit terminal 85 and ground terminal 86.
瀚慖f not within the specified range, replace the KR70 RAP/ACCY relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
瀚慖f not the specified value, replace the KR70 RAP/ACCY relay.
4. Install a 3 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less
than 2 Ohms between terminals 30 and 87.
瀚慖f greater than the specified range, replace the KR70 RAP/ACCY relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay
Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power
Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))
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2010 Cadillac Truck SRX AWD V6-3.0L Page 2171
Conditions for Setting the DTC
The control module is not configured properly.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Reference Information
Schematic Reference
Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information
Bus/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool References
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the appropriate DTC is not set.
If the DTC is set, program the control module specified by the DTC descriptor. If the DTC resets, replace the control module specified by the DTC
descriptor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for control module replacement, setup, and programming
U0400
DTC U0400-U05FF
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
Refer to Control Module U Code List (See: Diagnostic Trouble Code Descriptions/Control Module U Code List).
Circuit/System Description
Some control modules are constantly receiving information from other control modules through serial data communication network. The invalid