2010 Cadillac Truck SRX FWD V6-3.0L Page 1228

2010 Cadillac Truck SRX FWD V6-3.0L Page 1228

Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S87 fuel economy mode switch.

Note: It may take up to 2 minutes for all vehicle systems to power down.

2. Ignition OFF and all vehicle systems OFF, test for less than 5 ohm between ground circuit terminal 2 of the harness connector and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.

3. Ignition ON, test for 4.8-5.2 V between 5 V reference circuit terminal 9 of the harness connector and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, test for 0.060-0.250 V between signal circuit terminal 10 of the harness connector and ground.

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 ECM.

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 ECM.

5. If all circuits test normal, test or replace the S87 fuel economy mode switch.

Component Testing

1. Ignition OFF, disconnect the S87 fuel economy mode switch.

2. Test for 266-294 ohm between 5 V reference voltage circuit terminal 9 and signal circuit terminal 10 of the S87 fuel economy mode switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

3. Test for 1,414-1,562 ohm between 5 V reference voltage circuit terminal 9 and ground circuit terminal 2 of the S87 fuel economy mode

switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

4. With the S87 fuel economy mode switch button depressed, test for 486-538 ohm between 5 V reference voltage circuit terminal 9 and ground

circuit terminal 2 of the S87 fuel economy mode switch.

瀚慖f not within the specified range, replace the S87 fuel economy mode switch.

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 ECM replacement, setup and programming

P0160

DTC P0134, P0140, P0154, or P0160 (LF1)

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 P0134

- HO2S Circuit Insufficient Activity Bank 1 Sensor 1