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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1072 (Anti-Lock Brake System) >> Diagnostic Tests >> Anti-Lock Control - Hybrid >> Pinpoint Tests >> Pinpoint Test L: DTCs C1305, C2769, C2778, U1901 and U2527 - Sensor Cluster Fault >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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 CCA09 (VT/BN) and ground along circuit RCA09 (BN/VT). The sensor cluster and the ABS module communicate along circuits VCA23 (BU/WH) and VCA24 (GN/OG). 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 Description Fault Trigger Conditions
  • DTC C1305 - Longitudinal Accelerometer Signal Fault
 If the ABS module receives an input from the sensor cluster that does not agree with information from other sensors, the ABS module will set DTC C1305. This could be caused by a defective sensor cluster or the sensor cluster not being installed correctly.
  • DTC C2769 - Longitudinal Acceleration Sensor Electrical Failure
 This is a general failure of the sensor cluster. An open or a short to power or ground in one of the 4 sensor cluster circuits will cause the ABS module to set DTC C2769. The sensor cluster reporting information that is out of the normal range of operation, if the sensor is missing, if there is an internal failure of the sensor or if the sensor has either not been calibrated or has lost the calibration.
  • DTC C2778 - Sensor Power Supply Failure
 An open or short to ground in the sensor cluster power supply circuit will cause the ABS module to set DTC C2778.
  • DTC U1901 - CAN Network #2 Communication Bus Fault - Receive Error
 If the ABS module does not receive an expected message from the sensor cluster within a given period, the ABS module will set DTC U1901.
  • DTC C2527 - CAN Network #2 Bus Off - Transmit Error
 If the ABS module cannot send messages to the sensor cluster along the CAN2 bus, the ABS module will set DTC U2527.

This pinpoint test is intended to diagnose the following:

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