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C003A:29




Anti-Lock Control

Pinpoint Test B: DTCs C0030:07; C0031:29, 2F, 64; C0033:07; C0034:29, 2F, 64; C0036:07: C0037:29, 2F, 64; C0039:07; C003A:29, 2F or C003A:64

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

Normal Operation

The wheel speed sensor and wheel bearing magnetic strip 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(s)

- Wheel bearing magnetic strip(s)

- ABS module

PINPOINT TEST B : DTC C0030:07; C0031:29, 2F, 64; C0033:07; C0034:29, 2F, 64; C0036:07: C0037:29, 2F, 64; C0039:07; C003A:29, 2F OR 64

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

B1 CHECK THE DTCs FROM THE ABS MODULE SELF-TEST

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

Are DTCs C0031:01; C0034:01; C0037:01 and/or C003A:01 present?

Yes
GO to Pinpoint Test D Pinpoint Test D: DTCs C0031:01; C0034:01; C0037:01, C003A:01, C0031:19, C0034:19, C0037:19, C003A:19.

No
GO to B2.

B2 CHECK THE TIRES SIZE AND PRESSURE

- Verify that all tires and wheels are the same size and 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 B3.

No
INSTALL the correct size tire or ADJUST tire pressure as necessary.

B3 MONITOR THE WHEEL SPEED SENSOR PIDs

- Ignition ON.

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

- 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 B10.

No
GO to B4.

B4 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 B5.

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

B5 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 B6.

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

B6 CHECK WHEEL BEARING MAGNETIC STRIP FOR DAMAGE

- Inspect the wheel bearings for abnormal wear or roughness and for deformation or contamination of the seal and magnetic strip.

Are the wheel bearing(s) OK?

Yes
For wheel speed sensor testing with the Rotunda Active Wheel Speed Sensor Tester, GO to B7.

For wheel speed sensor testing without the Rotunda Active Wheel Speed Sensor Tester, GO to B9.

No
INSTALL a new wheel bearing as necessary. CLEAR the DTCs. REPEAT the self-test.

B7 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 B8.

No
GO to B11.

B8 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 Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear 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 bearing magnetic strip(s) and INSTALL new if necessary. If the wheel bearing magnetic strip is OK, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front Wheel Speed Sensor - Front or Wheel Speed Sensor - Rear Wheel Speed Sensor - Rear. CLEAR the DTCs. REPEAT the self-test.

B9 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 pins, harness side as follows:

Location Connector-Pin/ Circuit Connector-Pin/ Circuit LH front C1315-1 VCA03 (VT/WH) C1315-2 RCA17 (YE) RH front C1316-1 VCA05 (GY/VT) C1316-2 RCA19 (VT) LH rear C4296-1 VCA04 (BU/OG) C4296-2 RCA18 (BN/GN) RH rear C4318-1 VCA06 (WH/OG) C4318-2 RCA20 (BN)






Is the voltage greater than 10 volts?

Yes
GO to B10.

No
GO to B11.

B10 CHECK THE WHEEL SPEED SENSOR OUTPUT

NOTE: Digital Multimeter must have the leads in the current sensing ports and the correct range selected.

- 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 VCA04 (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 RCA18 (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), 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), 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 B11.

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

B11 CHECK FOR CORRECT ABS MODULE OPERATION

- Ignition OFF.

- Disconnect: ABS Module C135.

- Check for:
- corrosion
- pushed-out pins
- spread terminals


- Connect: ABS Module C135.

- Connect: Suspect Wheel Speed Sensor.

- 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 Hydraulic Control Unit (HCU) 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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