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Pinpoint Test E: ABS False Activation, ABS Too Sensitive Or ABS Activates On A Normal Stop




Anti-Lock Control

Pinpoint Tests

Pinpoint Test E: ABS False Activation, ABS Too Sensitive or ABS Activates on a Normal Stop

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 will automatically clear when a successful test drive is carried out. A successful test drive should include 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
- Front wheel bearings



PINPOINT TEST E: ABS FALSE ACTIVATION, ABS TOO SENSITIVE OR ABS ACTIVATES ON A NORMAL STOP

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

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E1 CHECK THE DTCs FROM THE SELF TEST


- Check the recorded results from the ABS self-test.
- Is DTC C1145, C1155, C1165 or C1175 present?

Yes
GO to Pinpoint Test D. Pinpoint Test D: DTCs C1145, C1155, C1165 and C1175

No
GO to E2.

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E2 CHECK THE TIRES SIZE AND PRESSURE


- Verify that the tires are the correct size for the vehicle as indicated on the Vehicle Certification (VC) label.
- Verify that the air pressure in each tire is correct as indicated on the VC label.
- Are the wheels and tires OK?

Yes
GO to E3.

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

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E3 INSPECT THE WHEEL SPEED SENSOR MOUNTING


- Ignition OFF.
- With the vehicle in NEUTRAL, position it on a hoist. Refer to Vehicle Jacking and Lifting.
- Inspect the suspect wheel speed sensor for looseness.
- Is the wheel speed sensor loose?

Yes
TIGHTEN the wheel speed sensor to specification. REFER to Specifications. CLEAR the DTCs. GO to E4.

No
GO to E5.

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E4 RECHECK THE WHEEL SPEED PIDs


- Ignition ON.
- Monitor the following PIDs while driving the vehicle at a constant speed:
- 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 all the wheel speed sensor PID values similar?

Yes
The vehicle is OK. The concern may have been caused by a loose wheel speed sensor.

No
GO to E5.

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E5 INSPECT 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 suspect wheel speed sensor for general damage.
- Is the wheel speed sensor OK?

Yes
GO to E6.

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.

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E6 INSPECT THE WHEEL SPEED SENSOR RING FOR DAMAGE


- Inspect the suspect wheel speed sensor ring for damaged or missing teeth. Rotate the wheel to verify that no teeth are missing.
- Is the wheel speed sensor ring OK?

Yes
For DTCs C1222, C1233 and C1234, GO to E7.

For DTCs C1235 and C1236, if the Active Wheel Speed Sensor Tester is available, GO to E8. If the Active Wheel Speed Sensor Tester is not available, GO to E10.

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

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E7 INSPECT THE WHEEL BEARING FOR DAMAGE


- Inspect the wheel bearings for damage.
- Are the wheel bearings OK?

Yes
If the Active Wheel Speed Sensor Tester is available, GO to E8.

If the Active Wheel Speed Sensor Tester is not available, GO to E10.

No
INSTALL a new wheel bearing and wheel hub as necessary. REFER to Front Suspension &/or Steering Knuckle for front wheel hubs or Rear Suspension for rear wheel hubs. CLEAR the DTCs. REPEAT the self-test.

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E8 CHECK THE ABS MODULE OUTPUT USING THE ACTIVE WHEEL SPEED SENSOR TESTER


- Ignition OFF.
- Disconnect: Suspect Wheel Speed Sensor.
- Connect the Active Wheel Speed Sensor Tester to the wheel speed sensor connectors.
- Ignition ON.
- Select the correct system polarity on the Active Wheel Speed Sensor Tester and turn the Active Wheel Speed Sensor Tester power switch to the ON position.
- Is the module output LED illuminated?

Yes
GO to E9.

No
GO to E11.

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E9 CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ACTIVE WHEEL SPEED SENSOR TESTER


- Raise the suspect wheel until it can spin freely. Refer to Vehicle Jacking and Lifting.
- While monitoring the 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. For the front wheel speed sensor, REFER to Wheel Speed Sensor - Front Wheel Speed Sensor - Front. For the rear wheel speed sensor, REFER to 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 speed sensor tone ring and INSTALL new if necessary. For the front wheel speed sensor tone ring, REFER to Wheel Speed Sensor Ring - Front Wheel Speed Sensor Ring - Front. For the rear wheel speed sensor tone ring, REFER to Wheel Speed Sensor Ring - Rear Wheel Speed Sensor Ring - Rear. If the tone ring is OK, INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to Wheel Speed Sensor - Front Wheel Speed Sensor - Front. For the rear wheel speed sensor, REFER to Wheel Speed Sensor - Rear Wheel Speed Sensor - Rear. CLEAR the DTCs. REPEAT the self-test.

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E10 CHECK THE ABS MODULE OUTPUT


- Ignition OFF.
- Disconnect: Suspect Wheel Speed Sensor.
- Ignition ON.
- For DTC C1233, measure the voltage between LF wheel speed sensor C150-2, circuit RCA17 (YE), harness side and LF wheel speed sensor C150-1, circuit VCA03 (VT/WH), harness side.
- For DTC C1234, measure the voltage between RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side and RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side.
- For DTC C1235, measure the voltage between RR wheel speed sensor C3117-2, circuit RCA20 (BN), harness side and RR wheel speed sensor C3117-1, circuit VCA06 (WH/OG), harness side.
- For DTC C1236, measure the voltage between LR wheel speed sensor C3116-2, circuit RCA18 (BN/GN), harness side and LR wheel speed sensor C3116-1, circuit VCA04 (BU/OG), harness side.




- Are the voltages greater than 10 volts?

Yes
INSTALL a new wheel speed sensor. For the front 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.

No
GO to E11.

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E11 CHECK THE WHEEL SPEED 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 indicated in the following chart:









- Are the resistances less than 5 ohms?

Yes
GO to E12.

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

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E12 CHECK FOR CORRECT ABS MODULE OPERATION


- Disconnect all ABS connectors.
- Check for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect all the ABS connectors and make sure they seat correctly.
- 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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