Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0186 09: Lateral Accelerometer Circuit Rate of Change Above ThresholdDTC C0186 1A: Lateral Accelerometer Circuit Bias Level Out Of Range
DTC C0186 3B: Lateral Accelerometer Circuit Erratic Internal Self Test Failed
DTC C0186 75: Lateral Accelerometer Circuit Signal Above Allowable Range
DTC C0196 09: Yaw Rate Circuit Rate of Change Above Threshold
DTC C0196 1A: Yaw Rate Circuit Bias Level Out Of Range
DTC C0196 3B: Yaw Rate Sensor Internal Self Test Failed
DTC C0196 75: Yaw Rate Circuit Signal Above Allowable Range
DTC C0287 0F: Longitudinal Circuit Signal Erratic
DTC C0287 3B: Longitudinal Circuit Signal Internal Self Test Failed
DTC C0287 55: Longitudinal Circuit Signal Expected Number of Events Not Reached
DTC C0287 5A: Longitudinal Circuit Signal Plausibility Failure
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Yaw Rate/ Longitudinal/ Lateral Accelerometer Supply Voltage Circuit | -- | -- | -- | -- |
Yaw Rate/ Longitudinal/ Lateral Accelerometer Communication Circuit | -- | -- | -- | C0186/ C0196 09, 3B, 1A, 75; C0287 0F, 3B , 55, 5A |
Yaw Rate/ Longitudinal/ Lateral Accelerometer Communication Circuit | -- | -- | -- | C0186/ C0196 09, 3B, 1A, 75; C0287 0F, 3B , 55, 5A |
Yaw Rate/ Longitudinal/ Lateral Accelerometer Communication Ground Circuit | -- | -- | -- | -- |
Circuit/System Description
The longitudinal/ lateral accelerometer and the yaw rate sensors are combined into one sensor. The sensors communicate through the serial data network to the Vehicle Stability Control Module along with other control modules to perform stability control. The vehicle stability enhancement system (with JL7) uses the longitudinal/lateral accelerometer input when calculating the desired yaw rate.
Conditions for Running the DTC
The ignition switch is in the ON position.
DTC C0561 71 is not set as a result of a lateral acceleration sensor circuit or internal fault during the current ignition cycle.
Conditions for Setting the DTC
C0186 09
The lateral accelerometer combination changes by more than 550 meters/second per second.
C0186 3B
The lateral accelerometer combination sensor fails an internal self test.
C0186 1A
The lateral accelerometer combination bias exceeds 3 meters/second.
C0186 75
The lateral accelerometer combination signal above allowable range.
C0196 09
The Yaw Rate combination sensor changes by more than 455 degrees/second per second.
C0196 3B
The Yaw Rate combination sensor fails an internal self test.
C0196 39
The Yaw Rate combination sensor has an internal electronic failure.
C0196 1A
The Yaw Rate combination bias exceeds 5.7 degrees/second.
C0196 75
The Yaw Rate combination signal above allowable range.
C0287 0F
The Longitudinal combination sensor signal is momentarily implausible or discontinuous.
C0287 3B
The Longitudinal combination sensor fails an internal test.
C0287 55
The Longitudinal combination ssensor 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
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Verification
Ignition ON, observe the scan tool yaw rate and logitudinal/ 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
- Verify that DTC U2100, or U2142 and not set.
- Ignition OFF, disconnect the harness connector at the yaw rate/long/lat sensor.
- Ignition OFF for 60 seconds, test for less than 5 ohms between the low reference circuit terminal 6 and ground.
- Ignition ON, test for B+ between the ignition voltage circuit terminal 1 and ground.
- If all circuits test normal, replace the yaw rate/long/lat sensor. If DTC resets, replace the EBCM.
| ⇒ | If DTCs are set, refer to. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
| ⇒ | If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup and programming |
