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C0031:62




Anti-Lock Control

Pinpoint Test E: DTCs C0031:2F, C0031:62, C0034:2F, C0034:62, C0037:2F, C0037:62, C003A:2F, C003A:62 and C0078:61

Normal Operation

The wheel speed sensors are active sensors and generate a square wave signal that is sent to the ABS module. When the ignition is turned to the RUN position, the ABS module carries out a self-test to determine if the sensors are functional. Voltage and ground are supplied to the front wheel speed sensors from the ABS module along 2 circuits.

Wheel speed sensor DTCs are set in continuous memory and they automatically clear when a successful test drive is carried out. A successful test drive includes speeds above 32 km/h (20 mph) and at least one ABS stop.





This pinpoint test is intended to diagnose the following:

- Mismatched tire sizes

- Wheel speed sensor ring

- Wheel speed sensor

- ABS module

PINPOINT TEST E : DTCs C0031:2F, C0031:62, C0034:2F, C0034:62, C0037:2F, C0037:62, C003A:2F, C003A:62 AND C0078:61

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

E1 CHECK THE DTCs FROM THE SELF-TEST

- Review the DTCs retrieved and recorded during Inspection and Verification.

Are DTCs C0031:13; C0034:13; C0037:13 and/or C003A:13 present?

Yes
GO to Pinpoint Test D Pinpoint Test D: DTCs C0031:13, C0031:17, C0031:23 (LF), C0034:13, C0034:17, C0034:23 (RF), C0037:13, C0037:17, etc..

No
GO to E2.

E2 CHECK THE TIRE SIZES AND PRESSURE

- Verify that all tires and wheels are the same size and that the tire size and inflation pressures are correct as indicated on the Vehicle Certification (VC) label.

Are the wheels and tires OK?

Yes
GO to E3.

No
INSTALL the correct size tire/wheel or ADJUST tire pressure as necessary. CLEAR the DTCs. REPEAT the self-test.

E3 MONITOR THE WHEEL SPEED SENSOR PIDs

- Ignition ON.

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

- Drive the vehicle at a speed greater than 20 km/h (12 mph) while monitoring the following PIDs:
- Left front wheel speed sensor (LF_WSPD)

- Right front wheel speed sensor (RF_WSPD)

- Left rear wheel speed sensor (LR_WSPD)

- Right rear wheel speed sensor (RR_WSPD)


Are the wheel speed PIDs consistent (within [5 km/h (3 mph]) with each other and the vehicle speed as indicated on the speedometer?

Yes
GO to E11.

No
GO to E4.

E4 CHECK THE WHEEL SPEED SENSOR FOR DAMAGE

- NOTE: Examine the wheel speed sensor wire carefully with a good light source. Failure to verify damage in the wheel speed sensor wire can lead to unnecessary installation of a new component.
Inspect the wheel speed sensor and harness for abrasion, broken connector tabs or water intrusion.


Is the wheel speed sensor and harness OK?

Yes
GO to E5.

No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

E5 INSPECT THE WHEEL SPEED SENSOR MOUNTING

- Ignition OFF.

- With the vehicle in NEUTRAL, position it on a hoist.

- Inspect the wheel speed sensor and fastener for looseness.

Are the wheel speed sensor and fastener tight?

Yes
GO to E6.

No
TIGHTEN the wheel speed sensor to specification. REFER to Specifications. CLEAR the DTCs. REPEAT the self-test.

E6 CHECK TONE RING FOR DAMAGE

- Inspect the tone rings for abnormal wear or roughness and for damage.

Are the tone ring(s) OK?

Yes
For wheel speed sensor testing with the Rotunda Active Wheel Speed Sensor Tester, GO to E7.

For wheel speed sensor testing without the Rotunda Active Wheel Speed Sensor Tester, GO to E9.

No
INSTALL a new tone ring as necessary. REFER to Wheel Speed Sensor Ring - Front or Wheel Speed Sensor Ring - Rear . CLEAR the DTCs.
REPEAT the self-test.

E7 CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER

- Disconnect: Suspect Wheel Speed Sensor.

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

- Ignition ON.

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

Is the module output LED illuminated?

Yes
GO to E8.

No
GO to E11.

E8 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 overload 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 overload LED is not illuminated and the sensor output LEDs illuminate green, but do not flash, 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 sensor output LEDs still illuminate but do not flash REPLACE the suspect tone ring(s). REFER to Wheel Speed Sensor Ring - Front or Wheel Speed Sensor Ring - Rear .

E9 CHECK FOR CORRECT ABS MODULE OUTPUT

- Disconnect: Suspect Wheel Speed Sensor.

- Ignition ON.






- Measure the voltage between the suspect wheel speed sensor connector, harness side as follows:

Location Connector-Pin/ Circuit Connector-Pin/ Circuit LF C150-1 VCA03 (VT/WH) C150-2 RCA17 (YE) RF C160-1 VCA05 (GY/VT) C160-2 RCA19 (VT) LR C3116-1 VCA04 (BU/OG) C3116-2 RCA18 (BN/GN) RR C3117-1 VCA06 (WH/OG) C3117-2 RCA20 (BN)

Is the voltage greater than 10 volts?

Yes
GO to E10.

No
GO to E11.

E10 CHECK THE WHEEL SPEED SENSOR OUTPUT

- Disconnect: Suspect Wheel Speed Sensor.

NOTE: The digital multimeter must have the leads in the current sensing ports and the correct range selected.
Measure the current between the suspect wheel speed sensor connector, harness side as follows:






- For the LF wheel speed sensor:
- connect the meter between LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side and LF wheel speed sensor pin 1, component side.

- connect a fused jumper wire between LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speed sensor pin 2, component side.


- For the RF wheel speed sensor:
- connect the meter between RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor pin 1, component side.

- connect a fused jumper wire between RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side and RF wheel speed sensor pin 2, component side.






- For the LR wheel speed sensor:
- connect the meter between LR wheel speed sensor C3116-1, circuit VCA04 (BU/OG), harness side and LR wheel speed sensor pin 1, component side.

- connect a fused jumper wire between LR wheel speed sensor C3116-2, circuit RCA18 (BN/GN), harness side and LR wheel speed sensor pin 2, component side.






- For the RR wheel speed sensor:
- connect the meter between RR wheel speed sensor C3117-1, circuit VCA06 (WH/OG), harness side and RR wheel speed sensor pin 1, component side.

- connect a fused jumper wire between RR wheel speed sensor C3117-2, circuit RCA20 (BN), harness side and RR wheel speed sensor pin 2, component side.






- Ignition ON.

- Measure the current while slightly rotating the wheel, using incremental turns.

Does the digital multimeter indicate the current switches between the low state (5 to 8 mA) and the high state (12 to 16 mA)?

Yes
GO to E11.

No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear . CLEAR the DTCs. REPEAT the self-test.

E11 CHECK FOR CORRECT ABS MODULE OPERATION

- Disconnect: ABS Module.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect: ABS Module.

- Make sure the connector is seated 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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