C1517

-
PINPOINT TEST 5: DTCs B2741, C1279, C1280, C1281, C1282, C1516, C1517, C2769, C2770, C2777, C2778 AND U1901 - SENSOR CLUSTER FAULT

Normal Operation

The yaw rate sensor, roll rate sensor, lateral accelerometer and longitudinal accelerometer are contained in one module called the stability control sensor cluster. The sensor cluster measures the vehicle acceleration, roll rate and yaw rate, then sends the signal through a secondary, dedicated controller area network (CAN2) bus to the ABS module. The ABS module compares the information from the sensor cluster to information it receives from other sensors (brake pedal input, steering wheel rotation sensor, etc.) to determine how valid the information is and to determine if a roll-over event is about to occur.
The ABS module provides power to the sensor cluster along circuit (V/BR) and ground along circuit (G/V). The sensor cluster and the ABS module communicate along circuits (L/W) and (G/O). An open circuit or a short to power or ground on any one of these 4 circuits will cause the ABS module to set a DTC. Also, if the sensor cluster is not mounted in the correct position, with the electrical connector facing the passenger seat, the ABS module will also set DTCs.

- DTC B2741 (Sensor Cluster Defective) - This is a general failure of the sensor cluster. An open or short to power or ground in one of the 4 sensor cluster circuits will cause the ABS module to set this fault. This DTC will also set if the sensor cluster is reporting information that is out of the normal range or operation, there is an internal failure of the sensor, the sensor cluster either has not been calibrated or lost the calibration or if the sensor is missing or mounted incorrectly.
- DTC C1279 (Yaw Rate Sensor Circuit Failure) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C1280 (Yaw Rate Sensor Signal Fault) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C1281 (Lateral Accelerometer Circuit Failure) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C1282 (Lateral Accelerometer Signal Fault) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C1516 (Roll Rate Sensor Signal Fault) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C1517 (Roll Rate Sensor Circuit Failure) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C2769 (Longitudinal Acceleration Sensor Electrical Failure) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C2770 (Longitudinal Acceleration Sensor Plausibility Failure) - An open or short to power or ground in one of the 4 sensor cluster circuits or an internal failure of the sensor will cause this fault to set.
- DTC C2777 (Sensor Cluster Bus Failure) - An open or short to power or ground in one of the CAN2 bus circuits or an internal failure of the sensor will cause this fault to set.
- DTC C2778 (Sensor Power Supply Failure) - With vehicle speed of more than 20 km/h (12 mph), if battery voltage is less then 9.7 volts or more than 18 volts for more than 210 ms, DTC C2778 will be set. During the on-demand self-test, the ABS module will only set DTC C2778 if the battery voltage is more than 18 volts for more than 210 ms.
- DTC U1901 (CAN Network #2 Communication Bus Fault) - An open or short to power or ground in one of the CAN2 bus circuits or an internal failure of the sensor will cause this fault to set.

Possible Causes
- Wiring, terminals or connectors
- Stability control sensor cluster
- ABS module

Diagnostic Procedure

CAUTION: Use the flex probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

NOTE: Before diagnosing the sensor cluster, always check the sensor cluster installation and mounting surface. The cluster should be installed with the electrical connector facing the RH side of the vehicle and cluster mounting surface should be clean and free of any foreign objects.

NOTE: The yaw rate sensor, roll rate sensor, lateral accelerometer and longitudinal accelerometer are integral to the sensor cluster.

NOTE: The vehicle must be on level ground, not on a hoist and at a complete standstill. Any vehicle movement will result in false values for this test.

Step 1-Step 3:

Step 4-Step 6:

Step 7-Step 8:

Step 9-Step 10: