C1233
Anti-Lock Control - Three-Channel
Pinpoint Test E: DTCs C1222, C1233, C1234 and C1237
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.
Voltage and ground signals are supplied to the wheel speed sensors from the ABS module.
This pinpoint test is intended to diagnose the following:
- Mismatched tire sizes
- Wheel speed sensor tone ring
- Wheel speed sensor
- ABS module
PINPOINT TEST E : DTCs C1222, C1233, C1234 AND C1237
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
E1 RETRIEVE ABS MODULE DTCs
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.
Is DTC C1145, C1155 or C1230 present?
Yes
GO to Pinpoint Test D. Pinpoint Test D: DTCs C1145 (RF), C1155 (LF) or C1230 (REAR)
No
If DTC C1222 is present, GO to E8.
If DTC C1233, C1234 and/or C1237 is present and the Rotunda Active Wheel Speed Sensor Tester is available, GO to E2. If DTC C1233 or C1234 is present and the Rotunda Active Wheel Speed Sensor Tester is not available, GO to E5. If DTC C1237 is present and the Rotunda Active Wheel Speed Sensor Tester is not available, GO to E6.
If no DTCs are present, GO to E8.
E2 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 tester and turn the tester power switch to the ON position.
Is the module output LED illuminated?
Yes
GO to E4.
No
GO to E3.
E3 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN
- Disconnect: ABS Module C135.
- Measure the resistance between the ABS module C135, harness side and the suspect wheel speed sensor connector, harness side as follows:
DTC ABS Module Circuit Wheel Speed Sensor C1145 C135-3 VCA05 (GY/VT) C160-1 C135-4 RCA19 (VT) C160-2 C1155 C135-27 VCA03 (VT/WH) C150-1 C135-28 RCA17 (YE) C150-2 C1230 C135-35 RCA21 (BN/GN) C455-2 C135-36 VCA07 (BU/OG) C455-1
Are the resistances less than 5 ohms?
Yes
GO to E4.
No
REPAIR the open in the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
E4 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 tester LEDs illuminate and flash and is the current overload LED not illuminated?
Yes
INSPECT the wheel speed sensor tone ring for damage and looseness. INSTALL new components as necessary. If the tone ring is OK, the concern may have been caused by a loose wheel speed sensor or excessive air gap.
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, Rear Wheel Drive (RWD) , Wheel Speed Sensor - Front, Four Wheel Drive (4WD) or Wheel Speed Sensor - Rear, Three-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, INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) , Wheel Speed Sensor - Front, Four Wheel Drive (4WD) or Wheel Speed Sensor - Rear, Three-Channel . CLEAR the DTCs. REPEAT the self-test.
E5 CHECK THE FRONT WHEEL SPEED SENSOR OUTPUT
- Ignition OFF.
- Disconnect: Wheel Speed Sensor C150 (LF) or C160 (RF).
- For DTC C1234:
- Connect the fused jumper wire between RF wheel speed sensor C160-1, circuit VCA05 (GY/VT), harness side and RF wheel speed sensor C160, pin 1, circuit VCA05 (GY/VT), component side.
- Connect a automotive meter between RF wheel speed sensor C160-2, circuit RCA19 (VT), harness side and RF wheel speed sensor C160, pin 2, circuit RCA19 (VT), component side.
- For DTC C1233:
- Connect a fused jumper wire between LF wheel speed sensor C150-1, circuit VCA05 (GY/VT), harness side and LF wheel speed sensor C150, pin 1, circuit VCA05 (GY/VT), component side.
- Connect the automotive meter between LF wheel speed sensor C150-2, circuit RCA19 (VT), harness side and LF wheel speed sensor C150, pin 2, circuit RCA19 (VT), component side.
- Measure the current while slightly rotating the wheel using incremental turns.
Does the automotive meter switch between the low state (5-8 mA) and the high state (12-16 mA)?
Yes
INSPECT the wheel speed sensor tone ring for damage and looseness. INSTALL new components as necessary. If the tone ring is OK, GO to E9.
No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Front, Four Wheel Drive (4WD) . CLEAR the DTCs. REPEAT the self-test.
E6 CHECK THE REAR WHEEL SPEED SENSOR OUTPUT
- Ignition OFF.
- Disconnect: Rear Wheel Speed Sensor C445.
- Connect the automotive meter between rear wheel speed sensor, C455-1, circuit VCA07 (BU/OG), harness side and rear wheel speed sensor, pin 1 circuit VCA07 (BU/OG), component side.
- Connect a fused jumper wire between rear wheel speed sensor, C455-1, circuit RCA21 (BN/GN), harness side and rear wheel speed sensor, pin 2 circuit RCA21 (BN/GN), component side.
- Ignition ON.
- Measure the current while slightly rotating the wheel using incremental turns.
Does the automotive meter switch between the low state (5-8 mA) and the high state (12-16 mA)?
Yes
INSPECT the wheel speed sensor tone ring for damage and looseness. INSTALL new components as necessary. If the tone ring is OK, GO to E9.
No
INSTALL a new rear wheel speed sensor. REFER to Wheel Speed Sensor - Rear, Three-Channel . CLEAR the DTCs. REPEAT the self-test.
E7 CHECK FOR CORRECT BCM (Body Control Module) CONFIGURATION
NOTE: DTC C1222 indicates that there is a concern with the axle configuration in the Body Control Module (BCM).
- Carry out the BCM (Body Control Module) configuration. Verify that the vehicle data matches the vehicle options.
- Clear the DTC and carry out the self-test.
Is DTC C1222 still present?
Yes
GO to E8.
No
The system is operating correctly at this time. CLEAR the DTC. REPEAT the self-test.
E8 CHECK FOR CORRECT TIRE SIZE
- Inspect the tire(s).
Are the tire sizes correct for this vehicle?
Yes
GO to E9.
No
INSTALL the incorrect size tires and wheels. CLEAR the DTC. REPEAT the self-test.
E9 MONITOR THE WHEEL SPEED SENSOR PID
- Enter the following diagnostic mode on the scan tool: DataLogger- ABS Module.
- Drive the vehicle at various speeds above 10 km/h (6 mph) while monitoring the following PIDs:
- Left Front Wheel Speed (LF_WSPD)
- Right Front Wheel Speed (RF_WSPD)
- Rear Differential Wheel Speed (R_DIF_SPD)
Do all of the PIDs match?
Yes
GO to E12.
No
GO to E10.
E10 INSPECT THE WHEEL SPEED SENSOR FOR DAMAGE OR LOOSENESS
- 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 or looseness or an excessive air gap.
Is the wheel speed sensor OK?
Yes
GO to E11.
No
INSTALL a new wheel speed sensor. REFER to Wheel Speed Sensor - Front, Four Wheel Drive (4WD) , Wheel Speed Sensor - Front, Rear Wheel Drive (RWD) or Wheel Speed Sensor - Rear, Three-Channel . CLEAR the DTCs. REPEAT the self-test.
E11 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 rear wheel speed sensor tone ring. REFER to Wheel Speed Sensor Ring - Rear, Four-Channel . CLEAR the DTCs. REPEAT the self-test.
E12 CHECK THE ABS MODULE CONNECTORS
- Disconnect the ABS module connector.
- Check for:
- corrosion
- pushed-out pins
- spread terminals
- Connect the ABS module connector and make sure that it is seated 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 DTC. 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. TEST the system for normal operation.