C1299
Anti-Lock Control
Pinpoint Test C: DTCs C1222, C1296, C1297, C1298 and C1299
Normal Operation
The wheel speed sensor and sensor ring generates a square wave current signal to the ABS module that is proportional to the wheel speed. The ABS module compares the wheel speed inputs from all the wheel speed sensors to determine an impending wheel lockup. Incorrect tire size can set these DTCs as well.
This pinpoint test is intended to diagnose the following:
- ABS module
- Wheel speed sensor ring
- Wheel speed sensor
PINPOINT TEST C : DTCs C1222, C1296, C1297, C1298 AND C1299
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE: If the ignition is turned ON when 1 or more wheel speed sensors are disconnected, the ABS module will disable the output to that sensor. Make sure all test connections are made at the wheel speed sensors before turning the ignition ON.
C1 CHECK THE DTCs FROM THE SELF-TEST
- Connect the scan tool.
- Ignition ON.
- Retrieve the ABS module DTCs.
Is DTC C1145, C1155, C1165 or C1175 present?
Yes
GO to Pinpoint Test B. Pinpoint Test B: DTCs C1145, C1155, C1165 and C1175
No
GO to C2.
C2 CHECK THE TIRE 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 all the tires is correct as indicated on the VC (Vehicle Certification) label.
Are the wheels and tires OK?
Yes
GO to C3.
No
INSTALL the correct tires or ADJUST tire pressure as necessary. CLEAR the DTCs. TEST the system for normal operation.
C3 INSPECT THE WHEEL SPEED SENSOR MOUNTING
- Ignition ON.
- With the vehicle in NEUTRAL, position it on a hoist.
- 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 C4.
No
GO to C5.
C4 CHECK 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 C5.
C5 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 C6.
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.
C6 INSPECT THE WHEEL SPEED SENSOR RING AND WHEEL BEARING FOR DAMAGE
- Inspect the wheel bearing 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 and wheel bearing OK?
Yes
GO to C7.
No
INSTALL a new front or rear wheel hub and bearing. CLEAR the DTCs. REPEAT the self-test.
C7 CHECK THE ABS MODULE OUTPUT
NOTE: The ABS module will detect an open circuit condition and disable the voltage to the wheel speed sensor if the ignition is set to the ON position before all test connections are made.
NOTE: A meter with min/max feature and/or recording capabilities must be used to obtain accurate measurements.
- Ignition OFF.
- Connect: ABS Module C135.
- Connect the meter to the suspect wheel speed sensor electrical connector pins, harness side.
- Set the meter to DC voltage in a range greater than 15 volts.
- Enable the min/max feature.
- Ignition ON.
- Check the maximum recorded voltage on the meter.
Is the maximum recorded 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 DTCs. REPEAT the self-test.
No
GO to C8.
C8 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN
NOTE: Both circuits must be checked for each DTC.
- Disconnect: Suspect Wheel Speed Sensor.
- Ignition OFF.
- Disconnect: ABS Module C135.
- 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:
Wheel Speed Sensor Circuit ABS Module DTC C1296- Wheel Speed Sensor LF Signal Fault C150-1 VCA03 (VT/WH) C135-21 C150-2 RCA17 (YE) C135-34 DTC C1297- Wheel Speed Sensor RF Signal Fault C160-1 VCA05 (GY/VT) C135-18 C160-2 RCA19 (VT) C135-6 DTC C1298- Wheel Speed Sensor RR Signal Fault C3116-1 VCA06 (WH/OG) C135-19 C3116-2 RCA20 (BN) C135-31 DTC C1299- Wheel Speed Sensor LR Signal Fault C3117-1 VCA04 (BU/OG) C135-33 C3117-2 RCA18 (BN/GN) C135-20
Are the resistances less than 5 ohms?
Yes
GO to C9.
No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
C9 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module C135.
- Check for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect the ABS module connector and make sure it seats 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 . CLEAR the DTCs. REPEAT the self-test.
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.