Pinpoint Test J: DTCS C2768, C2769, C2778, C2783. C1305, U1901 And U2527 - Sensor Cluster Circuit Fault

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

NOTE: The longitudinal accelerometer is integral to the sensor cluster. The sensor cluster is not repairable and must be installed as an assembly.

J1 CARRY OUT THE RECALIBRATION PROCEDURE
NOTE: Make sure the vehicle is not on a hoist and is sitting on level ground before performing stability assist module calibration.
- Key in ON position.
- Connect the scan tool.
- Clear the DTCs. Carry out the sensor cluster recalibration procedure using the diagnostic tool.
- Retrieve the DTCs.
- Are any DTCs retrieved or does the recalibration procedure indicate a fault?
Yes: GO to J2.

No: The ABS system is operating correctly. The condition may have been caused by an incomplete or inaccurate calibration.

J2 CHECK THE SENSOR CLUSTER CIRCUITRY FOR AN OPEN

Key in OFF position.
Disconnect: ABS Module C1462.
Disconnect: Sensor Cluster C2296.

Measure the resistance between ABS module D1462, harness side and the sensor cluster C2296, harness side as follows:

ABS MODULE CONNECTOR-PIN REFERENCE

ABS Module Connector Pin	Circuit	Sensor Cluster Connector Pin	Circuit
C1462-39	1576 (TN/BK)	C2296-3	1576 (TN/BK)
C1462-27	1575 (BK/WH)	C2296-5	1575 (BK/WH)
C1462-26	1815 (PK/LB)	C2296-1	1815 (PK/LB)
C1462-11	1814 (WH/LB)	C2296-2	1814 (WH/LB)

Fig 1: Checking Sensor Cluster Circuitry For An Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes: GO to J3.

No: REPAIR the circuit(s) in question. CLEAR the DTC(s). CALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

J3 CHECK THE SENSOR CLUSTER CIRCUITRY FOR A SHORT TO POWER

Key in ON position.

Measure the voltage between the sensor cluster, harness side and ground as follows:

SENSOR CLUSTER CONNECTOR PIN REFERENCE

Sensor Cluster Connector Pin	Circuit
C2296-1	1815 (PK/LB)
C2296-2	1814 (WH/LB)
C2296-3	1576 (TN/BK)
C2296-5	1575 (BK/WH)

Fig 2: Checking Sensor Cluster Circuitry For Short To Power

Courtesy of FORD MOTOR CO.

Is voltage present?

Yes: REPAIR the circuit(s) in question. CLEAR the DTC(s). CALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

No: GO to J4.

J4 CHECK THE SENSOR CLUSTER CIRCUITRY FOR A SHORT TO GROUND

Key in OFF position.

Measure the resistance between the sensor cluster, harness side and ground as follows:

SENSOR CLUSTER CONNECTOR PIN REFERENCE

Sensor Cluster Connector Pin	Circuit
C2296-1	1815 (PK/LB)
C2296-2	1814 (WH/LB)
C2296-3	1576 (TN/BK)
C2296-5	1575 (BK/WH)

Fig 3: Checking Sensor Cluster Circuit For Short To Ground

Courtesy of FORD MOTOR CO.

Is the resistance greater than 10,000 ohms?

Yes: GO to J5.

No: REPAIR the circuit(s) in question. CLEAR the DTC(s). CALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

J5 CHECK THE ABS MODULE LONGITUDINAL ACCELERATION PID
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.
- Enter the following diagnostic mode on the scan tool: ABS Module PID.
- Monitor the ABS module longitudinal acceleration PID.
- Is the ABS module longitudinal acceleration PID value between -4 and +4?
Yes: GO to J6.

No: CHECK the mounting of the sensor cluster. If OK, INSTALL a new sensor cluster. REFER to ACCELEROMETER - HYBRID . CLEAR the DTC(s). CALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.
J6 CHECK FOR ABS MODULE OPERATION
- Key in OFF position.
- Disconnect: ABC Module C1462.
- Disconnect: Sensor Cluster C2296.
- Check for:
  - corrosion.
  - pushed-out pins.
  - damaged pins.
  - male-to-female harness pin alignment.
- Connect: ABS Module C1462.
- Connect: Sensor Cluster C2296.
- Key in ON position.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) - HYBRID . TEST the system for normal operation.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTC(s). REPEAT the self-test.