Code No. C1200: FR wheel speed sensor circuit
Code No. C1205: FL wheel speed sensor circuit
Code No. C1210: RR wheel speed sensor circuit
Code No. C1215: RL wheel speed sensor circuit


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).

OPERATION



DIAGNOSIS CODE SET CONDITIONS


The ASTC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASTC-ECU detects the open or short circuit in the circuit, it will set a diagnosis code.

PROBABLE CAUSES


Current trouble
Past trouble

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No. C1200, C1205, C1210 or C1215 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III data list
Check the following service data (Refer to ).

  • (When code No. C1200 is set) Item No. 01: FR wheel speed sensor
  • (When code No. C1205 is set) Item No. 02: FL wheel speed sensor
  • (When code No. C1210 is set) Item No. 03: RR wheel speed sensor
  • (When code No. C1215 is set) Item No. 04: RL wheel speed sensor

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 4.

STEP 4. Measure the voltage at the ASTC-ECU connector.
(1)Connector check: ASTC-ECU connector and wheel speed sensor connectors
(2)Disconnect the connector and measure at the wiring harness side.
(3)Ignition switch: "ON"
(4)Measure the voltage between the power supply terminal as well as signal terminal of each wheel speed sensor and body earth.
Diagnosis code No.
Checking terminal
Power supply terminal
 Signal terminal
C1200
 FR+
 FR-
C1205
 FL+
 FL-
C1210
 RR+
 RR-
C1215
 RL+
 RL-
OK: 1 V or less

Q. Is the check result normal?
Go to Step 5.
NO (No. C1200 NG) : Go to Step 6.
NO (No. C1205 NG) : Go to Step 7.
NO (No. C1210 NG) : Go to Step 8.
NO (No. C1215 NG) : Go to Step 9.

STEP 5. Measure the resistance at the ASTC-ECU connector.
(1)Disconnect the connector.
(2)Measure the resistance between the power supply terminal as well as signal terminal of each wheel speed sensor and body earth.
Diagnosis code No.
Checking terminal
Power supply terminal
 Signal terminal
C1200
 FR+
 FR-
C1205
 FL+
 FL-
C1210
 RR+
 RR-
C1215
 RL+
 RL-
OK: No continuity

Q. Is the check result normal?
Go to Step 10.
NO (No. C1200 NG) : Go to Step 6.
NO (No. C1205 NG) : Go to Step 7.
NO (No. C1210 NG) : Go to Step 8.
NO (No. C1215 NG) : Go to Step 9.

STEP 6. Check the wiring harness wires between the ASTC-ECU connector FR (+) or FR (-) terminal and the front wheel speed sensor (RH) connector terminal.
Check the front wheel speed sensor (RH) circuit for short.

Q. Is the check result normal?
Replace the front wheel speed sensor (RH) (Refer to ).
Repair the connector(s) and wiring harness.

STEP 7. Check the wiring harness wires between the ASTC-ECU connector FL (+) or FL (-) terminal and the front wheel speed sensor (LH) connector terminal.
Check the front wheel speed sensor (LH) circuit for short.

Q. Is the check result normal?
Replace the front wheel speed sensor (LH) (Refer to ).
Repair the connector(s) and wiring harness.

STEP 8. Check the wiring harness wires between the ASTC-ECU connector RR (+) or RR (-) terminal and the rear wheel speed sensor (RH) connector terminal.
Check the rear wheel speed sensor (RH) circuit for short.

Q. Is the check result normal?
Replace the rear wheel speed sensor (RH) (Refer to ).
Repair the connector(s) and wiring harness.

STEP 9. Check the wiring harness wires between ASTC-ECU connector RL (+) or RL (-) terminal and the rear wheel speed sensor (LH) connector terminal.
Check the rear wheel speed sensor (LH) circuit for short.

Q. Is the check result normal?
Replace the rear wheel speed sensor (LH) (Refer to ).
Repair the connector(s) and wiring harness.

STEP 10. Measure the voltage at the ASTC-ECU connector.
(1)Measure with the connector(s) connected.
(2)Ignition switch: "ON"
(3)Measure the voltage between the power supply terminal as well as signal terminal of each wheel speed sensor and body earth.
Diagnosis code No.
Checking terminal
Power supply terminal
 Signal terminal
C1200
 FR+
 FR-
C1205
 FL+
 FL-
C1210
 RR+
 RR-
C1215
 RL+
 RL-
OK:
    Power supply terminal: Approx. system voltage
    Signal terminal: approximately 0.4 to 1.3 V

Q. Is the check result normal?
Go to Step 15.
NO (No. C1200 NG) : Go to Step 11.
NO (No. C1205 NG) : Go to Step 12.
NO (No. C1210 NG) : Go to Step 13.
NO (No. C1215 NG) : Go to Step 14.

STEP 11. Check the wiring harness wires between the ASTC-ECU connector FR (+) or FR (-) terminal and the front wheel speed sensor (RH) connector terminal.
Check the front wheel speed sensor (RH) circuit for open.

Q. Is the check result normal?
Go to Step 15.
Repair the wiring harness.

STEP 12. Check the wiring harness wires between the ASTC-ECU connector FL (+) or FL (-) terminal and the front wheel speed sensor (LH) connector terminal.
Check the front wheel speed sensor (LH) circuit for open.

Q. Is the check result normal?
Go to Step 15.
Repair the wiring harness.

STEP 13. Check the wiring harness wires between the ASTC-ECU connector RR (+) or RR (-) terminal and the rear wheel speed sensor (RH) connector terminal.
Check the rear wheel speed sensor (RH) circuit for open.

Q. Is the check result normal?
Go to Step 15.
Repair the wiring harness.

STEP 14. Check the wiring harness wires between ASTC-ECU connector RL (+) or RL (-) terminal and the rear wheel speed sensor (LH) connector terminal.
Check the rear wheel speed sensor (LH) circuit for open.

Q. Is the check result normal?
Go to Step 15.
Repair the wiring harness.

STEP 15. Check the wheel speed sensor.
Refer to .

Q. Is the check result normal?
Go to Step 16.
Replace the wheel speed sensor (Refer to ).

STEP 16. Diagnosis code recheck
Check again if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Ignition switch: LOCK (OFF) position to ON
(3)Drive the vehicle until the vehicles speed reaches 20 km/h.

Q. Is diagnosis code No. C1200, C1205, C1210 or C1215 set?
Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).