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
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- 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 - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to and ).
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OPERATION
- The wheel speed sensor is a kind of a pulse generator. It consists of encoders
(a plate on which north and south pole sides of the magnets are arranged alternately) for detecting
the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This
sensor outputs frequency pulse signals in proportion to the wheel speed.
- The pulse signals, which the wheel speed sensor creates, are sent to ASC-ECU. ASC-ECU
uses the frequency of the pulse signals to determine the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
The ASC-ECU monitors the voltage fluctuation in each wheel speed sensor circuit. If ASC-ECU
detects the open or short circuit in the circuit, it will set a diagnosis code.
PROBABLE CAUSES
Current trouble
- Damaged harness wires and connectors
- Malfunction of the wheel speed sensor
- Malfunction of ASC-ECU
- Noise interference
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 - How to Use Troubleshooting/Inspection
Service Points).
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STEP 1. M.U.T.-III CAN bus diagnosis.
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines.
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Q.
Is diagnosis code No. C1200, C1205, C1210 or C1215 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. M.U.T.-III data list.
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Check the following service data (Refer to ).
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- (When code No. C1200 is set) Item 01: FR wheel speed sensor
- (When code No. C1205 is set) Item 02: FL wheel speed sensor
- (When code No. C1210 is set) Item 03: RR wheel speed sensor
- (When the code No. C1215 is set) Item 04: RL wheel speed sensor
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Q.
Is the check result normal?
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Go to Step 17.
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Go to Step 4.
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STEP 4. Measure the voltage at the ASC-ECU connector.
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(1)Connector check: ASC-ECU connector and wheel speed sensor connectors.
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(2)Disconnect the connector and measure at the wiring harness side.
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(4)Measure the voltage between the power supply terminal as well as signal terminal
of each wheel speed sensor and body earth.
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Diagnosis code No.
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Checking terminal
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Power supply terminal
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Signal terminal
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C1200
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FR+
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FR-
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C1205
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FL+
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FL-
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C1210
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RR+
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RR-
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C1215
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RL+
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RL-
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OK: 1 V or less
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Q.
Is the check result normal?
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Go to Step 5.
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NO (No. C1200 NG) : Go to Step 6.
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NO (No. C1205 NG) : Go to Step 7.
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NO (No. C1210 NG) : Go to Step 8.
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NO (No. C1215 NG) : Go to Step 9.
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STEP 5. Measure the resistance at the ASC-ECU connector.
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(1)Disconnect the connector.
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(2)Measure the resistance between the power supply terminal as well as signal terminal
of each wheel speed sensor and body earth.
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Diagnosis code No.
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Checking terminal
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Power supply terminal
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Signal terminal
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C1200
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FR+
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FR-
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C1205
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FL+
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FL-
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C1210
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RR+
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RR-
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C1215
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RL+
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RL-
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OK: No continuity
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Q.
Is the check result normal?
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Go to Step 11.
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NO (No. C1200 NG) : Go to Step 6.
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NO (No. C1205 NG) : Go to Step 7.
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NO (No. C1210 NG) : Go to Step 8.
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NO (No. C1215 NG) : Go to Step 9.
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STEP 6. Check the wiring harness wires between the ASC-ECU connector
FR (+) or FR (-) terminal and the front wheel speed sensor (RH) connector
terminal.
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Check the front wheel speed sensor (RH) circuit for short.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair the connector(s) and wiring harness. Then go to Step 18.
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STEP 7. Check the wiring harness wires between the ASC-ECU connector
FL (+) or FL (-) terminal and the front wheel speed sensor (LH) connector
terminal.
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Check the front wheel speed sensor (LH) circuit for short.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair the connector(s) and wiring harness. Then go to Step 18.
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STEP 8. Check the wiring harness wires between the ASC-ECU connector
RR (+) or RR (-) terminal and the rear wheel speed sensor (RH) connector terminal.
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Check the rear wheel speed sensor (RH) circuit for short.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair the connector(s) and wiring harness. Then go to Step 18.
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STEP 9. Check the wiring harness wires between the ASC-ECU connector
RL (+) or RL (-) terminal and the rear wheel speed sensor (LH) connector terminal.
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Check the rear wheel speed sensor (LH) circuit for short.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair the connector(s) and wiring harness. Then go to Step 18.
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STEP 10. Check for wheel speed sensor as a single unit.
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Q.
Is the check result normal?
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Go to Step 11.
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Replace the wheel speed sensor. Then go to Step 18.
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STEP 11. Measure the voltage at the ASC-ECU connector.
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(1)Measure with the connector(s) connected.
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(3)Measure the voltage between the power supply terminal as well as signal terminal
of each wheel speed sensor and body earth.
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Diagnosis code No.
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Checking terminal
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Power supply terminal
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Signal terminal
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C1200
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FR+
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FR-
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C1205
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FL+
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FL-
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C1210
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RR+
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RR-
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C1215
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RL+
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RL-
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OK:
Power supply terminal: Approx. system voltage
Signal terminal: approximately 0.4 to 1.3 V
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Q.
Is the check result normal?
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Go to Step 16.
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NO (No. C1200 NG) : Go to Step 12.
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NO (No. C1205 NG) : Go to Step 13.
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NO (No. C1210 NG) : Go to Step 14.
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NO (No. C1215 NG) : Go to Step 15.
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STEP 12. Check the wiring harness wires between the ASC-ECU connector
FR (+) or FR (-) terminal and the front wheel speed sensor (RH) connector
terminal.
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Check the front wheel speed sensor (RH) circuit for open.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair the wiring harness. Then go to Step 18.
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STEP 13. Check the wiring harness wires between the ASC-ECU connector
FL (+) or FL (-) terminal and the front wheel speed sensor (LH) connector
terminal.
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Check the front wheel speed sensor (LH) circuit for open.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair the wiring harness. Then go to Step 18.
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STEP 14. Check the wiring harness wires between the ASC-ECU connector
RR (+) or RR (-) terminal and the rear wheel speed sensor (RH) connector terminal.
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Check the rear wheel speed sensor (RH) circuit for open.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair the wiring harness. Then go to Step 18.
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STEP 15. Check the wiring harness wires between the ASC-ECU connector
RL (+) or RL (-) terminal and the rear wheel speed sensor (LH) connector terminal.
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Check the rear wheel speed sensor (LH) circuit for open.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair the wiring harness. Then go to Step 18.
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STEP 16. Check for wheel speed sensor as a single unit.
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Q.
Is the check result normal?
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Go to Step 17.
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Replace the wheel speed sensor. Then go to Step 18.
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STEP 17. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Drive the vehicle at 20 km/h or more.
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Q.
Is diagnosis code No. C1200, C1205, C1210 or C1215 set?
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Replace the hydraulic unit assembly (integrated with ASC-ECU) (Refer to ).
Then go to Step 18.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).
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STEP 18. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Drive the vehicle at 20 km/h or more.
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Q.
Is diagnosis code No. C1200, C1205, C1210 or C1215 set?
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Return to Step 3.
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This diagnosis is complete.
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