Pinpoint Test T: DTCs C0031:2F, C0031:62, C0034:2F, C0034:62, C0037:2F, C0037:62, C003A:2F, C003A:62, C0078:61
Anti-Lock Control - Four-Channel
Pinpoint Tests
Pinpoint Test T: DTCs C0031:2F, C0031:62, C0034:2F, C0034:62, C0037:2F, C0037:62, C003A:2F, C003A:62, C0078:61
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
The wheel speed sensor and sensor ring generate a square wave signal to the ABS module that is proportional to wheel speed. The ABS module compares wheel speed inputs from all wheel speed sensors to determine an impending wheel lockup.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Wheel speed sensor
- Tone ring(s)
- Mismatched tires/wheels
- ABS module
PINPOINT TEST T: DTCs C0031:2F, C0031:62, C0034:2F, C0034:62, C0037:2F, C0037:62, C003A:2F, C003A:62, C0078:61
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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T1 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 S. Pinpoint Test S: DTCs C0031:13, C0031:17, C0031:23 (LF), C0034:13, C0034:17, C0034:23 (RF), C0037:13, C0037:17, C0037:23 (LR),
No
GO to T2.
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T2 CHECK THE TIRES SIZE 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 T3.
No
INSTALL the correct size tire/wheel or ADJUST tire pressure as necessary. CLEAR the DTCs. REPEAT the self-test.
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T3 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 with each other, within 5 km/h (3 mph) and the vehicle speed as indicated on the speedometer?
Yes
GO to T11.
No
GO to T4.
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T4 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 T5.
No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) Wheel Speed Sensor - Front, Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) Wheel Speed Sensor - Front or Wheel Speed Sensor - Front, Four Wheel Drive (4WD) Wheel Speed Sensor - Front. CLEAR the DTCs. REPEAT the self-test.
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T5 INSPECT THE WHEEL SPEED SENSOR MOUNTING
- Ignition OFF.
- With the vehicle in NEUTRAL, position it on a hoist. Refer to Jacking and Lifting Service and Repair.
- Inspect the wheel speed sensor and fastener for looseness.
- Are the wheel speed sensor and fastener tight?
Yes
GO to T6.
No
TIGHTEN the wheel speed sensor to specification. REFER to Specifications. CLEAR the DTCs. REPEAT the self-test.
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T6 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 T7.
For wheel speed sensor testing without the Rotunda Active Wheel Speed Sensor Tester, GO to T9.
No
INSTALL a new tone ring as necessary. REFER to Wheel Speed Sensor Ring - Rear, Four-Channel Wheel Speed Sensor Ring - Rear, Four-Channel. CLEAR the DTCs. REPEAT the self-test.
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T7 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.
- 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 T8.
No
GO to T11.
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T8 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER
- Raise the suspect wheel until it can spin freely. Refer to Jacking and Lifting Service and Repair.
- 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, Four Wheel Drive (4WD) Wheel Speed Sensor - Front, or Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear, Four-Channel Wheel Speed Sensor - Rear, Four-Channel. 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 tone ring(s) and INSTALL new if necessary. REFER to Wheel Speed Sensor Ring - Rear, Four-Channel Wheel Speed Sensor Ring - Rear, Four-Channel If the tone ring(s) are OK, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) Wheel Speed Sensor - Front, or Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear, Four-Channel Wheel Speed Sensor - Rear, Four-Channel. CLEAR the DTCs. REPEAT the self-test.
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T9 CHECK FOR CORRECT ABS MODULE OUTPUT
- Ignition OFF.
- Disconnect: Suspect Wheel Speed Sensor.
- Ignition ON.
- Measure the voltage between the suspect wheel speed sensor connector, harness side as follows:
- Is the voltage greater than 10 volts?
Yes
GO to T10.
No
GO to T11.
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T10 CHECK THE WHEEL SPEED SENSOR OUTPUT
- Disconnect: Suspect Wheel Speed Sensor.
- NOTE: 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 LF wheel speed sensor DTCs:
- 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 RF wheel speed sensor DTCs:
- 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 LR wheel speed sensor DTCs:
- connect the meter between LR wheel speed sensor C440-1, circuit VCA07 (BU/OG), harness side and LR wheel speed sensor pin 1, component side.
- connect a fused jumper wire between LR wheel speed sensor C440-2, circuit RCA21 (BN/GN), harness side and LR wheel speed sensor pin 2, component side.
- For RR wheel speed sensor DTCs:
- connect the meter between RR wheel speed sensor C426-1, circuit VCA06 (WH/OG) or (BU/OG), harness side and RR wheel speed sensor pin 1, component side.
- connect a fused jumper wire between RR wheel speed sensor C426-2, circuit RCA20 (BN) or (BN/GN), 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 T11.
No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) Wheel Speed Sensor - Front, Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear, Four-Channel Wheel Speed Sensor - Rear, Four-Channel. CLEAR the DTCs. REPEAT the self-test.
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T11 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module.
- Check for:
- corrosion
- pushed-out pins
- spread terminals
- 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 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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