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Home >> Mercury >> 2009 >> Milan AWD V6-3.0L >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test G: DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 and U1901

Pinpoint Test G: DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 and U1901




Anti-Lock Control

Pinpoint Tests

Pinpoint Test G: DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 and U1901

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Normal Operation

The yaw rate sensor, lateral accelerometer and longitudinal accelerometer are contained in one assembly called the stability control sensor cluster. The sensor cluster measures vehicle yaw rate, lateral and longitudinal acceleration and then sends the information to the ABS module along a secondary Controller Area Network (CAN) bus. This CAN bus is used only for communication between the sensor cluster and the ABS module. The information sent to the ABS module is used to help determine if the Electronic Stability Control (ESC) system needs to be activated.

Voltage is supplied to the sensor cluster by the ABS module along circuit CCA09 (VT/BN), ground is provided by the ABS module along circuit RCA09 (GN/VT) and the sensor information is transmitted to the ABS module along circuits VCA23 (BU/WH) and circuit VCA24 (GN/OG).

DTC B2741 / DTC C1279-C2778 / DTC U1901:





This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Sensor cluster incorrectly mounted
- Sensor cluster internal fault
- ABS module



PINPOINT TEST G: DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 AND U1901

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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

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G1 CARRY OUT THE SENSOR CLUSTER CALIBRATION PROCEDURE


- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Chassis - IVD Initialization.
- Following the scan tool directions, carry out the IVD Initialization sequence.
- Test drive the vehicle above 20 km/h (12 mph), making several tight circles and hard-braking maneuvers.
- Retrieve and record any ABS module DTCs.
- Does the IVD Initialization sequence indicate a fault or are DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 and/or U1901 present?

Yes
If DTC C1963 is retrieved or if the IVD Initialization sequence indicates a fault, GO to G2.

For DTCs B2741, C1279, C1280, C1281, C1282, C1963, C2769, C2770, C2777, C2778 and U1901, GO to G3.

For all other ABS module DTCs, GO to the ABS Module DTC Chart. [1][2]Diagnostic Trouble Code Descriptions

No
The system is operating correctly at this time. The concern may have been caused by an incorrect or incomplete IVD Initialization sequence. CLEAR the DTCs. REPEAT the self-test.

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G2 CHECK THE SENSOR CLUSTER CONDITION AND INSTALLATION


NOTE: When correctly installed, the stability control sensor cluster electrical connector will be facing the rear of the vehicle.

- Inspect the sensor cluster for damage and correct installation. Refer to Stability Control Sensor Cluster Service and Repair.
- Is the sensor cluster installed correctly and undamaged?

Yes
GO to G3.

No
REINSTALL or INSTALL new as necessary. CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G3 CHECK THE VOLTAGE TO THE SENSOR CLUSTER


NOTE: The stability control sensor cluster is located under the floor console.

- Disconnect: Stability Control Sensor Cluster C3073.
- Ignition ON.
- Measure the voltage between sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to G6.

No
GO to G4.

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G4 CHECK CIRCUIT CCA09 (VT/BN) FOR AN OPEN OR EXCESSIVE RESISTANCE


- Ignition OFF.
- Disconnect: ABS Module C135.
- Measure the resistance between ABS module C135-22, circuit CCA09 (VT/BN), harness side and sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to G5.

No
REPAIR circuit CCA09 (VT/BN). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G5 CHECK CIRCUIT CCA09 (VT/BN) FOR A SHORT TO GROUND


- Measure the resistance between sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to G15.

No
REPAIR circuit CCA09 (VT/BN). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G6 CHECK CIRCUIT RCA09 (GN/VT) FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: ABS Module C135.
- Ignition ON.
- Measure the voltage between sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side and ground.




- Is any voltage present?

Yes
REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

No
GO to G7.

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G7 CHECK CIRCUIT RCA09 (GN/VT) FOR AN OPEN OR EXCESSIVE RESISTANCE


- Ignition OFF.
- Measure the resistance between ABS module C135-29, circuit RCA09 (GN/VT), harness side and sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to G8.

No
REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G8 CHECK CIRCUIT RCA09 (GN/VT) FOR A SHORT TO GROUND


- Measure the resistance between sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to G9.

No
REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G9 CHECK THE SENSOR CLUSTER CAN CIRCUITS FOR AN OPEN


- Measure the resistance between ABS module C135, harness and sensor cluster C3073, harness side using the following chart:









- Are the resistances less than 5 ohms?

Yes
GO to G10.

No
REPAIR the affected circuit(s). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G10 CHECK THE SENSOR CLUSTER CIRCUITS FOR A SHORT TO GROUND


- Ignition OFF.
- Measure the resistance between ground and:
- sensor cluster C3073-2, circuit VCA24 (GN/OG), harness side.
- sensor cluster C3073-3, circuit VCA23 (BU/WH), harness side.




- Are the resistances greater than 10,000 ohms?

Yes
GO to G11.

No
REPAIR the affected circuit(s). CLEAR the DTC. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

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G11 CHECK THE SENSOR CLUSTER CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition ON.
- Measure the voltage between ground and:
- sensor cluster C3073-2, circuit VCA24 (GN/OG), harness side.
- sensor cluster C3073-3, circuit VCA23 (BU/WH), harness side.




- Is any voltage present?

Yes
REPAIR the affected circuit(s). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence. FOLLOW the scan tool directions. REPEAT the self-test.

No
GO to G12.

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G12 CHECK THE ABS MODULE YAW RATE VALUE PID (YAW_RATE)


- Ignition OFF.
- Connect: Sensor Cluster C3073.
- Connect: ABS Module C135.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
- NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
- Monitor the YAW_RATE PID.
- Is the YAW_RATE PID value between -0.05 and 0.05?

Yes
GO to G13.

No
INSTALL a new sensor cluster. REFER to Stability Control Sensor Cluster Service and Repair. CLEAR DTCs. REPEAT the self-test.

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G13 CHECK THE ABS MODULE LATERAL ACCELERATION PID (LAT_ACCL)


- NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
- Monitor the LAT_ACCL PID.
- Is the LAT_ACCL PID value between -0.007 and 0.007 or does the PID value change in the same manner as vehicle movement?

Yes
GO to G14.

No
INSTALL a new sensor cluster. REFER to Stability Control Sensor Cluster Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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G14 CHECK THE ABS MODULE LONGITUDINAL ACCELERATION PID (LONG_ACCL)


- NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
- Monitor the LONG_ACCL PID.
- Is the LONG_ACCL PID value between -0.004 and 0.004?

Yes
GO to G15.

No
INSTALL a new sensor cluster. REFER to Stability Control Sensor Cluster Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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G15 CHECK THE ABS MODULE CONNECTORS


- Ignition OFF.
- Disconnect: ABS Module C135.
- Check ABS module C135 for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: ABS Module C135.
- Make sure the connector seats correctly, then operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. 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 DTCs. REPEAT the self-test.

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