DTC C1047: FR wheel speed sensor control phase time exceeded: Diagnosis

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
MB991997: ASC check harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C1047 set?

YES : Go to Step 3.

NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check that the diagnostic trouble codes No. C1015, C101C, C101F, and C1042 are simultaneously set.

Q: Are DTC C1015, C101C, C101F, and C1042 also set?

YES : Carry out the diagnosis for the diagnostic trouble codes that are set, and then go to Step 5.

NO : Go to Step 4.
STEP 4. Scan tool service data
Check the following service data. (Refer to DATA LIST REFERENCE TABLE .)
- Item No.02: FR wheel speed sensor
Q: Is the check result normal?

YES : Go to Step 16.

NO : Go to Step 5.
STEP 5. Voltage measurement at A-05 ASC-ECU connector
1. Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the wiring harness-side connector, and then measure at the special tool connector side.
  NOTE: Do not connect the special tool to ASC-ECU.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the wheel speed sensor power supply terminal (signal terminal) No. 34 and the body ground as well as between the ground terminal No. 33 and the body ground.
  
  Fig 1: Measuring Voltage Between Wheel Speed Sensor Connector Terminal No. 34 And Body Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  OK: 1 volt or less
Q: Is the check result normal?

YES : Go to Step 6.

NO (Not normal at terminal 34 or 33) : Go to Step 7.
STEP 6. Resistance measurement at A-05 ASC-ECU connector
1. Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the wiring harness-side connector, and then measure at the special tool connector side.
  NOTE: Do not connect the special tool to ASC-ECU.
2. Measure the resistance between the wheel speed sensor circuit power supply terminal (signal terminal) No. 34 and the body ground as well as between the ground terminal No. 33 and the body ground.
  
  Fig 2: Measuring Resistance Between Wheel Speed Sensor Connector Terminal No. 34 And Body Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  OK: No continuity
Q: Is the check result normal?

YES : Go to Step 9.

NO (Not normal at terminal 34 or 33) : Go to Step 7.
STEP 7. Connector check: A-05 ASC-ECU connector, A-03 wheel speed sensor < FR > connector
Q: Is the check result normal?

YES : Go to Step 8.

NO : Repair the defective connector. Then go to Step 17.
STEP 8. Wiring harness check between A-05 ASC-ECU connector terminal No. 34 and A-03 wheel speed sensor < FR > connector terminal No. 1, and between A-05 ASC-ECU connector terminal No. 33 and A-03 wheel speed sensor < FR > connector terminal No. 2
- Short circuit check of wheel speed sensor < FR > circuit
Q: Is the check result normal?

YES : Replace the wheel speed sensor < FR >. (Refer to WHEEL SPEED SENSOR .) Then go to Step 17.

NO : Repair the wiring harness. Then go to Step 17.
STEP 9. Voltage measurement at A-05 ASC-ECU connector
1. Disconnect the ASC-ECU connector, connect the ASC check harness (Special tool: MB991997) to the ASC-ECU-side connector and the wiring harness-side connector, and then measure at the special tool connector side.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the wheel speed sensor circuit power supply terminal (signal terminal) No. 34 and the body ground.
  
  Fig 3: Measuring Voltage Between Wheel Speed Sensor Connector Terminal No. 34 And Body Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  OK: System voltage
Q: Is the check result normal?

YES : Go to Step 10.

NO : Go to Step 12.
STEP 10. Wiring harness check between A-05 ASC-ECU connector terminal No. 34 and A-03 wheel speed sensor < FR > connector terminal No. 1, and between A-05 ASC-ECU connector terminal No. 33 and A-03 wheel speed sensor < FR > connector terminal No. 2
- Open circuit check of wheel speed sensor < FR > circuit
Q: Is the check result normal?

YES : Go to Step 11.

NO : Repair the wiring harness. Then go to Step 17.
STEP 11. Check of wheel speed sensor as a single unit
Refer to WHEEL SPEED SENSOR CURRENT CHECK .

Q: Is the check result normal?

YES : Go to Step 13.

NO : Replace the wheel speed sensor < FR >. (Refer to WHEEL SPEED SENSOR .) Then go to Step 17.
STEP 12. Connector check: A-05 ASC-ECU connector, A-03 wheel speed sensor < FR > connector
Q: Is the check result normal?

YES : Go to Step 16.

NO : Repair the defective connector. Then go to Step 17.
STEP 13. Check of wheel speed sensor installation status
Check the installation status of wheel speed sensor < FR > (disconnection of wheel speed sensor, looseness of mounting bolt, etc.).

Q: Is the check result normal?

YES : Go to Step 14.

NO : Reinstall the wheel speed sensor < FR > correctly. (Refer to WHEEL SPEED SENSOR .) Then go to Step 17.
STEP 14. Wheel bearing looseness check
NOTE: Wheel bearing looseness may increase the gap between the wheel speed sensor and the wheel speed detection magnet encoder. Check the wheel bearing < FR > for looseness. (Refer to ON-VEHICLE SERVICE .)

Q: Is the check result normal?

YES : Go to Step 15.

NO : Replace the front hub assembly. (Refer to FRONT AXLE HUB ASSEMBLY .)
STEP 15. Check of wheel speed detection encoder
Check the encoder for adhesion of foreign materials or deformation.

Fig 4: Identifying Oil Seal, Hub, Magnetic Encoder And Wheel Bearing
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the check result normal?

YES : Go to Step 16.

NO (Adhesion of foreign materials) : Clean the encoder so as not to disturb the magnetization pattern on the encoder while taking care of the magnet, magnetic substance, and magnetic attraction.

NO (Deformation) : Replace the front hub assembly. (Refer to FRONT AXLE HUB ASSEMBLY .)
STEP 16. Check whether the DTC is reset.
Drive the vehicle at 12mph (20 km/h) or more.

NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1047 set?

YES : Replace the hydraulic unit (incorporates in ASC-ECU).(Refer to HYDRAULIC UNIT .) Then go to Step 17.

NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 17. Check whether the DTC is reset.
Drive the vehicle at 12mph (20 km/h) or more.

NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C1047 set?

YES : Return to Step 1.

NO : This diagnosis is complete.