2010 Cadillac CTS Sedan AWD V6-3.6L Page 702

2010 Cadillac CTS Sedan AWD V6-3.6L Page 702

The longitudinal combination sensor fails an internal test.

C0287 55

The longitudinal combination sensor detects fewer than the expected number of transitions.

C0287 5A

The longitudinal combination sensor fails two or more input parameters for plausibility.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* The vehicle stability enhancement system (VSES) and Traction control system (TCS) is disabled.

* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool yaw rate and longitudinal/ lateral accelerometer sensor parameter. The reading should be the same on all sensors

when driving in a straight line at a constant speed greater than 20 km/h (13 mph), and will vary as the vehicle changes direction.

Circuit/System Testing

1. Verify that DTC U1826 or U1827 and not set.

瀚慖f DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle).

2. Verify the yaw/lateral accelerometer sensor is mounted properly.

瀚慖f not mounted properly, refer to Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement (See: Brakes and Traction

Control/Antilock Brakes / Traction Control Systems/Yaw Rate Sensor/Service and Repair).

3. Ignition OFF, disconnect the harness connector at the yaw/lateral accelerometer sensor.

4. Ignition OFF, wait 1 minute, test for less than 10 ohm between the low reference circuit terminal 6 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuits test normal, replace the EBCM.

5. Ignition ON, test for B+ between the ignition voltage circuit terminal 1 and ground.

瀚慖f not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance. If the circuits test normal,