Code No.C1216: Wheel Speed Sensor (RL) System (Sensor Transmitting Error)

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C, CAN bus-line diagnostic flow

OPERATION

A toothed ABS rotor generates a voltage pulse as it moves across the pickup field of each wheel speed sensor.
The amount of voltage generated at each wheel is determined by the clearance between the ABS rotor teeth and the wheel speed sensor, and by the speed of rotation.
The wheel speed sensors transmit the frequency of the voltage pulses and the amount of voltage generated by each pulse to the ASTC-ECU.
The hydraulic unit assembly (integrated with ASTC-ECU) modulates the amount of braking force individually applied to each wheel cylinder.

DIAGNOSIS CODE SET CONDITIONS

The diagnosis code No. C1216 is set if any abnormal voltage from the wheel speed sensor is detected without the outputs of the code No. C1215.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to set are:

Malfunction of the wheel speed sensor
Teeth lack or clogging of the ABS rotor
Malfunction of the axle shaft bearing
Damaged wiring harness or connector
Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnostics

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normal?

Go to Step 3.

Repair the CAN bus line (Refer to GROUP 54C, CAN bus line Diagnostic flow

). Then go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

caution

Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.

(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Drive the vehicle at 15 km/h or more for 5 seconds or more.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Turn the ignition switch to the "ON" position.
(6)Check if the diagnosis code is set.
(7)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1216 set?

Go to Step 3.

The procedure is complete.

STEP 3. Check the installation condition of the wheel speed sensors.

Check whether the rear left wheel speed sensor or its mounting bolts are loosened.

Q. Is the check result normal?

	Go to Step 4.

	Reinstall the wheel speed sensor correctly. Then go to Step 11.

STEP 4. Check the wheel speed sensor after it is removed from the vehicle.

Check the rear left wheel speed sensor (Refer to

Q. Is the check result normal?

	Go to Step 5.

	Replace the rear left wheel speed sensor. Then go to Step 11.

STEP 5. Check the axle shaft bearing for looseness.

note

If the wheel bearing is loose, the gap between the wheel speed sensor and ABS rotor may become excessive. Check the axle shaft bearing, for looseness.

Check the axle shaft bearing (Refer to GROUP 27, On-vehicle service - Axle shaft axial play check ).

Q. Is the check result normal?

	Go to Step 6.

	NO (wheel bearing axial play is not within the standard value) : Replace the rear axle shaft bearing (Refer to GROUP 27, Axle shaft assembly ). Then go to Step 11.

STEP 6. Check the ABS rotor.

Check the rear right ABS rotor, for foreign material or deformation.

Q. Is the check result normal?

	Go to Step 7.

	NO (wheel bearing axial play is not within the standard value) : If the ABS rotor is contaminated with foreign material, clean it. If the rear axle shaft bearing is deformed, replace it (Refer to GROUP 27, Axle shaft assembly ). Then go to Step 11.

STEP 7. Check ASTC-ECU connector A-48, intermediate connector C-29, F-12 and wheel speed sensor <rear: LH> connector F-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the check result normal?

Go to Step 10.

Repair or replace the damaged component(s). Then go to Step 11.

STEP 8. Inspect the wheel speed sensor.

Check the rear left wheel speed sensor. For the applicable inspection procedure, refer to

Q. Is the check result normal?

	Go to Step 10.

	Go to Step 9.

STEP 9. Check the harness wires between ASTC-ECU connector A-48 (terminal 11, 27) and wheel speed sensor <rear: LH> connector F-11 (terminal 1, 2).

Q. Is the check result normal?

Go to Step 11.

Repair the wiring harness. Then go to Step 12.

STEP 10. Check whether the diagnosis code is reset.

Check again if the diagnosis code is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the diagnosis code.
(3)Drive the vehicle at 15 km/h or more for 5 seconds or more.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Turn the ignition switch to the "ON" position.
(6)Check if the diagnosis code is reset.
(7)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is code No.C1216set?

Replace the hydraulic unit assembly (integrated with ASTC-ECU). Then go to Step 11.

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

STEP 11. Check that the ABS warning lamp, ASTC indicator lamp, and ASTC OFF indicator lamp are turned OFF.

Check that the ABS warning lamp, ASTC indicator lamp and ASTC OFF indicator lamp goes out when the vehicle is driven at 15 km/h for 5 seconds or more.

Q. Does the ABS warning lamp, ASTC indicator lamp and ASTC OFF indicator lamp goes out?

	Go to Step 12.

	It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .

STEP 12. Check whether the diagnosis code is reset.

Q. Is code No.C1216 set?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

The procedure is complete.