Code No.C1202:
FR wheel speed sensor power circuit (malfunction power circuit)
Code No.C1207: FL wheel
speed sensor power circuit (malfunction power circuit)
Code No.C1212: RR wheel speed
sensor power circuit (malfunction power circuit)
Code No.C1217: RL wheel speed sensor
power circuit (malfunction power 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 - CAN Bus Diagnostics Table
 ).
- Before replacing the ECU, ensure that the communication circuit is normal.
|
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 ABS-ECU. ABS-ECU
uses the frequency of the pulse signals to determine the wheel speed.
DIAGNOSIS CODE SET CONDITION
Diagnosis code No.C1202, C1207, C1212 or C1217 is set when the supply voltage to each
wheel speed sensor has decreased.
PROBABLE CAUSES
Current trouble
- Damaged wiring harness and connectors
- Wheel speed sensor malfunction
- ABS-ECU malfunction
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions ).
|
|
STEP 1. M.U.T.-III CAN bus diagnosis
|
|
|
Use M.U.T.-III to diagnose the CAN bus lines.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 3.
|
|
|
|
|
|
 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
|
|
|
|
|
|
STEP 2. Diagnosis code recheck after resetting CAN bus lines
|
|
|
(1)Drive the vehicle at 30 km/h or more.
|
|
|
(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
|
|
|
Q.
Is diagnosis code No.C1202, C1207, C1212 or C1217 set?
|
|
|
Go to Step 3.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|
|
|
STEP 3. M.U.T.-III data list
|
|
|
Check the following data list (Refer to ).
|
|
|
- Item No.01: FL wheel speed sensor
- Item No.02: FR wheel speed sensor
- Item No.03: RL wheel speed sensor
- Item No.04: RR wheel speed sensor
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Go to Step 4.
|
|
|
|
|
|
STEP 4. Voltage measurement at the ABS-ECU connector
|
|
|
(1)Disconnect the ABS-ECU connector, front wheel speed sensor (RH) connector <C1202>,
front wheel speed sensor (LH) connector <C1207>, rear wheel speed sensor (RH) connector <C1212>,
rear wheel speed sensor (LH) connector <C1217>.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Measure the voltage between the ABS-ECU connector terminals.
Code No.C1202 is set
- Between FR+ terminal and body earth
Code No.C1207 is set
- Between FL+ terminal and body earth
Code No.C1212 is set4
- Between RR+ terminal and body earth
Code No.C1217 is set
- Between RL+ terminal and body earth
OK: 1 V or less
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the defective connector or the wiring harness. Then go to Step 8.
|
|
|
|
|
|
STEP 5. Resistance measurement at the ABS-ECU connector
|
|
|
(1)Disconnect the ABS-ECU connector, front wheel speed sensor (RH) connector <C1202>,
front wheel speed sensor (LH) connector <C1207>, rear wheel speed sensor (RH) connector <C1212>,
rear wheel speed sensor (LH) connector <C1217>.
|
|
|
(2)Measure the resistance between the ABS-ECU connector terminals.
Code No.C1202 is set
- Between FR+ terminal and body earth
Code No.C1207 is set
- Between FL+ terminal and body earth
Code No.C1212 is set4
- Between RR+ terminal and body earth
Code No.C1217 is set
- Between RL+ terminal and body earth
OK: No continuity
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Repair the defective connector or the wiring harness. Then go to Step 8.
|
|
|
|
|
|
STEP 6. Check for wheel speed sensor as a single unit
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Replace the wheel speed sensor (Refer to ). Then
go to Step 8.
|
|
|
|
|
|
STEP 7. Check whether the diagnosis code is set again.
|
|
|
(1)Drive the vehicle at 30 km/h or more.
|
|
|
(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
|
|
|
Q.
Is diagnosis code No.C1202, C1207, C1212 or C1217 set?
|
|
|
Replace the hydraulic unit [(integrated with ABS-ECU) Refer to ].
Then go to Step 8.
|
|
|
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions ).
|
|
|
|
|
|
STEP 8. Check whether the diagnosis code is set again.
|
|
|
(1)Drive the vehicle at 30 km/h or more.
|
|
|
(2)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
|
|
|
Q.
Is diagnosis code No.C1202, C1207, C1212 or C1217 set?
|
|
|
Return to Step 1.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|