Pinpoint Test F: DTC C1233 (LF), DTC C1234 (RF), DTC C1235 (RR), DTC C1236 (LR) - WHEEL SPEED SENSOR INPUT SIGNAL MISSING

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

F1 CHECK FOR DTCs
- Key in ON position.
- Connect the diagnostic tool.
- Is DTC C1145, C1155, C1165 or C1175 present?
- Yes : GO to PINPOINT TEST E .
- No : GO to F2.
F2 CHECK THE WHEEL SPEED PIDs
- Use the diagnostic tool to monitor the wheel speed PIDs while driving the vehicle at a constant speed.
- Are the 4 wheel speed PID values similar?
- Yes : CLEAR the DTC. DRIVE the vehicle. RETRIEVE DTCs. If DTC C1233, C1234, C1235 or C1236 is present, INSTALL a new anti-lock brake control module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this article . REPEAT the self-test.
- No : GO to F3.
F3 CHECK THE WHEEL SPEED SENSOR FOR DAMAGE AND/OR LOOSENESS
- Key in OFF position.
- With the vehicle in NEUTRAL, position the vehicle on a hoist. REFER to JACKING & LIFTING .
- Inspect the wheel speed sensor mounting for looseness. If the wheel speed sensor is suspected, inspect the sensor for corrosion or on the front anti-lock brake mounting flange. Clean as necessary.
- Is the wheel speed sensor OK?
- Yes : GO to F4.
- No : INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to WHEEL SPEED SENSOR - FRONT in this article . CLEAR the DTC. REPEAT the self-test. For the rear wheel speed sensor, REFER to WHEEL SPEED SENSOR - REAR in this article . CLEAR the DTC. REPEAT the self-test.
F4 CHECK FOR WHEEL SPEED SENSOR RING DAMAGE
- Remove the wheel speed sensor.
- Inspect the 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 : GO to F5.
- No : INSTALL a new wheel speed sensor ring. For the front wheel speed sensor ring, REFER to FRONT SUSPENSION . CLEAR the DTC. REPEAT the self-test. For the rear wheel speed sensor ring, REFER to REAR DRIVE HALFSHAFTS . CLEAR the DTC. REPEAT the self-test.

F5 CHECK THE ANTI-LOCK BRAKE CONTROL MODULE OUTPUT

Key in ON position.

Measure the voltage between ABS module C155 pins and the suspect wheel speed sensor connector pins as follows:

DTC C1233, DTC C1234, DTC C1235, DTC C1236 & WHEEL SPEED SENSOR CONNECTOR PIN SPECIFICATIONS

DTC	Circuit	ABS Module C155 Pin	Wheel Speed Sensor Connector Pin
C1234 (RF)	8-CF38 (WH/RD)	33	2
C1234 (RF)	7-CF38 (YE/RD)	34	1
C1233 (LF)	7-CF32 (YE)	45	1
C1233 (LF)	8-CF32 (WH)	46	2
C1235 (RR)	7-CF40 (YE/GN)	43	1
C1235 (RR)	8-CF40 (WH/GN)	42	2
C1236 (LR)	8-CF34 (WH/BU)	37	1
C1236 (LR)	7-CF34 (YE/BU)	36	2

Are the voltages greater than 9 volts?

Yes : INSTALL a new wheel speed sensor. For the front wheel speed sensor, REFER to WHEEL SPEED SENSOR - FRONT in this article . CLEAR the DTC. REPEAT the self-test. For the rear wheel speed sensor, REFER to WHEEL SPEED SENSOR - REAR in this article . CLEAR the DTC. REPEAT the self-test.
No : INSTALL a new anti-lock brake control module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this article . TEST the system for normal operation.