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C1145




Anti-Lock Control

Pinpoint Test D: DTCs C1145, C1155, C1165 and C1175

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

Normal Operation

The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition switch is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage through the right front wheel speed sensor and the related circuitry to determine if it is functional.

Voltage is supplied to the active wheel speed sensors from the ABS module, ground is also supplied by the ABS module.





This pinpoint test is intended to diagnose the following:

- Wheel speed sensor(s)

- Wiring, terminals or connectors

- ABS module

PINPOINT TEST D : DTCs C1145, C1155, C1165 AND C1175

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

NOTICE: No measurements should be taken with the wheel speed sensor connected. Damage to the wheel speed sensor results.

NOTE: Anytime a wheel speed sensor is removed, thoroughly clean the mounting surfaces and apply a thin coating of grease.

D1 CHECK FOR FAULT REPEATABILITY

NOTE: Both circuits must be checked for each DTC.

- Connect the scan tool.

- Ignition ON.

- Using the scan tool, clear all ABS module DTCs.

- Drive the vehicle at least 16 km/h (10 mph).

- Enter the following diagnostic mode on the scan tool: Self-Test- ABS Module.

- Retrieve and document all ABS module DTCs.

Is DTC C1145, C1155, C1165 or C1175 retrieved?

Yes
If the Rotunda Active Wheel Speed Sensor Tester is not available, GO to D4.

If the Rotunda Active Wheel Speed Sensor Tester is available, GO to D2.

No
INSPECT the wheel speed sensors, wheel speed sensor wiring and wheel speed sensor tone rings. REPAIR or INSTALL new as necessary. If any other DTCs are retrieved, REFER to the ABS Module DTC Chart. Antilock Brakes / Traction Control Systems

D2 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER

- Ignition OFF.

- Disconnect: Suspect Wheel Speed Sensor.

- Connect the Rotunda Active Wheel Speed Sensor Tester to the wheel speed sensor connectors.

- Select the correct system polarity on the Rotunda Active Wheel Speed Sensor Tester and turn the power switch to the ON position.

- Ignition ON.

Is the module output LED illuminated?

Yes
GO to D3.

No
GO to D6.

D3 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER

- Raise the suspect wheel until it can spin freely.

- While monitoring the Rotunda Active Wheel Speed Sensor Tester, slowly spin the suspect wheel.

Do the sensor output LEDs illuminate and flash and is the current overload LED not illuminated?

Yes
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.

No
If the current level LED is not illuminated and the sensor output LEDs do not illuminate or if the current level LED is illuminated red, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

If the current level LED is not illuminated and the sensor output LEDs illuminate green but do not flash, INSPECT the wheel speed sensor tone ring and INSTALL new if necessary. If the tone ring is OK, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

D4 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: ABS Module C135.

- Disconnect: Suspect Wheel Speed Sensor.

- Ignition ON.

- For DTC C1145, measure the voltage between:
- ABS module C135-34, circuit VCA05 (GY/VT), harness side and ground.

- ABS module C135-33, circuit RCA19 (VT), harness side and ground.






- For DTC C1155, measure the voltage between:
- ABS module C135-45, circuit VCA03 (VT/WH), harness side and ground.

- ABS module C135-46, circuit RCA17 (YE), harness side and ground.






- For DTC C1165, measure the voltage between:
- ABS module C135-43, circuit VCA06 (WH/OG), harness side and ground.

- ABS module C135-42, circuit RCA20 (BN), harness side and ground.






- For DTC C1175, measure the voltage between:
- ABS module C135-36, circuit VCA04 (BU/OG), harness side and ground.

- ABS module C135-37, circuit RCA18 (BN/GN), harness side and ground.






Is any voltage present?

Yes
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

No
GO to D5.

D5 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND

- Ignition OFF.

- For DTC C1145, measure the resistance between:
- ABS module C135-34, circuit VCA05 (GY/VT), harness side and ground.

- ABS module C135-33, circuit RCA19 (VT), harness side and ground.






- For DTC C1155, measure the resistance between:
- ABS module C135-45, circuit VCA03 (VT/WH), harness side and ground.

- ABS module C135-46, circuit RCA17 (YE), harness side and ground.






- For DTC C1165, measure the resistance between:
- ABS module C135-43, circuit VCA06 (WH/OG), harness side and ground.

- ABS module C135-42, circuit RCA20 (BN), harness side and ground.






- For DTC C1175, measure the resistance between:
- ABS module C135-36, circuit VCA04 (BU/OG), harness side and ground.

- ABS module C135-37, circuit RCA18 (BN/GN), harness side and ground.






Are the resistances greater than 10,000 ohms?

Yes
GO to D6.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D6 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN

NOTE: Both circuits must be checked for each DTC.

- Ignition OFF.

- Disconnect: ABS Module C135.

- Disconnect: Suspect Wheel Speed Sensor.

- Measure the resistance between the ABS module connector, harness side and the suspect wheel speed sensor connector, harness side as follows:

DTC ABS Module Circuit Wheel Speed Sensor C1145 C135-33 RCA19 (VT) C160-2 C135-34 VCA05 (GY/VT) C160-1 C1155 C135-46 RCA17 (YE) C150-2 C135-45 VCA03 (VT/WH) C150-1 C1165 C135-42 RCA20 (BN) C426-2 C135-43 VCA06 (WH/OG) C426-1 C1175 C135-37 RCA18 (BN/GN) C440-2 C135-36 VCA04 (BU/OG) C440-1






Are the resistances less than 5 ohms?

Yes
GO to D7.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D7 CHECK FOR WHEEL SPEED SENSOR CIRCUITS SHORTED TOGETHER

- For DTC C1145, measure the resistance between RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side.

- For DTC C1155, measure the resistance between LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side.

- For DTC C1165, measure the resistance between RR wheel speed sensor C426-1, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side.

- For DTC C1175, measure the resistance between LR wheel speed sensor C440-1, circuit VCA04 (BU/OG), harness side and LR wheel speed sensor C440-2, circuit RCA18 (BN/GN), harness side.





Are the resistances greater than 10,000 ohms?

Yes
GO to D8.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D8 CHECK THE ABS MODULE OUTPUT

NOTE: If the 2 wheel speed sensor circuits are shorted together, the ABS module shuts down those circuits and no voltage is present at the connectors. If this happens, cycle the ignition key and take the measurement again, being careful not to short the 2 wheel speed sensor circuits together.

- Connect: ABS Module C135.

- Ignition ON.

- For DTC C1145, measure the voltage between RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side.

- For DTC C1155, measure the voltage between LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side.

- For DTC C1165, measure the voltage between RR wheel speed sensor C426-1, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor C426-2, circuit RCA20 (BN), harness side.

- For DTC C1175, measure the voltage between LR wheel speed sensor C440-1, circuit VCA04 (BU/OG), harness side LR wheel speed sensor C440-2, circuit RCA18 (BN/GN), harness side.





Is the voltage greater than 10 volts?

Yes
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear . CLEAR the DTC. REPEAT the self-test.

No
GO to D9.

D9 CHECK FOR CORRECT ABS MODULE OPERATION

- Ignition OFF.

- Disconnect: ABS Module C135.

- Check ABS module C135 for:
- corrosion

- pushed-out pins

- spread terminals


- Connect: ABS Module C135.

- Connect: Suspect Wheel Speed Sensor.

- 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 . 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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