Pinpoint Test H: DTC C1279, C1280, C1281, C1282, C2769, C2770 - SENSOR CLUSTER FAULT

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

NOTE: The yaw rate sensor and accelerometer are integral to the sensor cluster. The sensor cluster is not serviceable and must be installed as an assembly.

H1 CARRY OUT THE YAW RATE SENSOR RECALIBRATION PROCEDURE
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Clear DTCs.
- Carry out the yaw rate sensor recalibration procedure using the diagnostic tool.
- Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs.
- Are any DTCs retrieved or does the recalibration procedure indicate a fault?
- Yes : GO to H2.
- No : The ABS system is operating correctly.
H2 CHECK THE ABS MODULE YAW RATE PID
- Monitor the ABS module yaw rate PID.
- Is the ABS module yaw rate PID value between 479 and 545?
- Yes : INSTALL a new yaw rate sensor. REFER to YAW RATE SENSOR in this article . CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE CONFIGURATION . REPEAT the self-test.
- No : GO to H3.
H3 REVERIFY THE ABS MODULE YAW RATE PID
- Monitor the ABS module yaw rate PID.
- Is the ABS module yaw rate PID value between 479 and 545?
- Yes : CHECK the ABS module connector for loose or corroded pins. CLEAR the DTC. REPEAT the self-test.
- No : GO to H4.
H4 CHECK THE VOLTAGE FROM THE ABS MODULE
- Key in OFF position.
- Disconnect: The Yaw Rate Sensor C3073.
- Key in ON position.
- Measure the voltage between yaw rate sensor C3073-1, circuit 5-CF66 (BU/WH), harness side and yaw rate sensor C3073-5, circuit 9-CF67 (BN/RD), harness side.
  
  Fig 1: Measuring Voltage Between Yaw Rate Sensor C3073-1, Circuit 5-CF66, Harness Side And Yaw Rate Sensor C3073-5, Circuit 9-CF67, Harness Side
  Courtesy of FORD MOTOR CO.
- Is the voltage approximately 10 volts?
- Yes : INSTALL a new sensor cluster. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this article . CLEAR the DTC. REPEAT the self-test.
- No : GO to H5.

H5 CHECK THE YAW RATE SENSOR CIRCUITRY FOR AN OPEN

Measure the resistance between ABS module C155 pins, harness side and yaw rate sensor C3073 pins, harness side as follows:

ABS Module C155 Pin	Yaw Rate Sensor C3073 Pin	Circuit
7	3	7-CF67 (YE/RD)
5	5	9-CC1 (BN/RD)/9-CF67 (BN/RD)
25	1	5-CF66 (BU/WH)
29	2	4-CF66 (GY/VT)

Is the resistance less than 5 ohms?

Yes : GO to H6.
No : REPAIR the circuit in question. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE CONFIGURATION . REPEAT the self-test.

H6 CHECK THE YAW RATE SENSOR CIRCUITRY FOR A SHORT TO VOLTAGE

Key in OFF position.
Disconnect: ABS Module C155.
Disconnect: Yaw Rate Sensor C3073.
Key in ON position.

Measure the voltage between yaw rate sensor C3073 pins, harness side and ground as follows:

Yaw Rate Sensor C3073 Pin	Circuit
3	7-CF67 (YE/RD)
5	9-CF67 (BN/RD)
1	5-CF66 (BU/WH)
2	4-CF66 (GY/VT)

Is voltage present?

Yes : REPAIR the circuit in question. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE CONFIGURATION . REPEAT the self-test.
No : GO to H7.

H7 CHECK THE YAW RATE SENSOR CIRCUITRY FOR A SHORT TO GROUND

Key in OFF position.

Measure the resistance between the yaw rate sensor C3073 pins, harness side and ground as follows:

Yaw Rate Sensor C3073 Pin	Circuit
3	7-CF67 (YE/RD)
5	9-CF67 (BN/RD)
1	5-CF66 (BU/WH)
2	4-CF66 (GY/VT)

Is the resistance greater than 10,000 ohms?

Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this article . CLEAR the DTC. REPEAT the self-test.
No : REPAIR the circuit in question. CLEAR the DTC. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REFER to MODULE CONFIGURATION . REPEAT the self-test.