DTC C1046: FL Wheel Speed Sensor Control Phase Time Exceeded: Diagnosis

WARNING: This page is about a different variant/trim than selected.

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

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

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1046 set?
1. YES: Go to Step 3.
2. NO: The procedure is complete.
STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C100A, C1011, C1014, or C1041 is also set.

Q: Is the DTC C100A, C1011, C1014, or C1041 also set?
1. YES: Carry out the diagnosis for the relevant DTC.
2. NO: Go to Step 4.
STEP 4. Using scan tool MB991958, check the data list
Check the following data list (Refer to DATA LIST REFERENCE TABLE ).
- Item No. 01: FL wheel speed sensor
Q: Is the check result normal?
1. YES: Go to Step 11.
2. NO: Go to Step 5.
STEP 5. Connector check: A-51 ASC-ECU connector, A-07 front wheel speed sensor < LH > connector
Q: Is the check result normal?
1. YES: Go to Step 6.
2. NO: Repair the defective connector. Then go to Step 13.
STEP 6. Wiring harness check between A-51 ASC-ECU connector terminal No. 45 and A-07 front wheel speed sensor < LH > connector terminal No. 1 and between A-51 ASC-ECU connector terminal No. 46 and A-07 front wheel speed sensor < LH > connector terminal No. 2.
Q: Is the check result normal?
1. YES: Go to Step 7.
2. NO: Repair the wiring harness. Then go to Step 13.
STEP 7. Check for wheel speed sensor < FL > installation
Check how the wheel speed sensor < FL > is installed (Disconnection of wheel speed sensor < FL >, loose mounting bolt, etc.).

Q: Is the check result normal?
1. YES: Go to Step 8.
2. NO: Reinstall the wheel speed sensor < FL > correctly (Refer to WHEEL SPEED SENSOR ). Then go to Step 8.
STEP 8. Check for wheel speed sensor < FL > output current
Refer to WHEEL SPEED SENSOR OUTPUT CURRENT MEASUREMENT .

Q: Is the check result normal?
1. YES: Go to Step 9.
2. NO: Replace the wheel speed sensor < FL > (Refer to WHEEL SPEED SENSOR ). Then go to Step 12.
STEP 9. Check for wheel bearing looseness
NOTE:
- Loose wheel bearing may increase the gap between the wheel speed sensor < FL > and the wheel speed detection magnet encoder.
- Check the wheel bearing < FL > for looseness (Refer to WHEEL BEARING END PLAY CHECK ).
Q: Is the check result normal?
1. YES: Go to Step 10.
2. NO: Replace the wheel bearing < FL > (Refer to FRONT AXLE HUB ASSEMBLY ). Then go to Step 13.
STEP 10. Check of wheel speed detection encoder
Check the encoder for adhesion of foreign materials or deformation.

Q: Is the check result normal?
1. YES: Go to Step 11.
2. NO (Adhesion of foreign materials): Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction. Then go to Step 13.
3. NO (Deformation): Replace the wheel bearing < FL > (Refer to FRONT AXLE HUB ASSEMBLY ). Then go to Step 13.
  
  Fig 1: Identifying Wheel Bearing, Oil Seal And Magnetic Encoder
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 11. Check whether the DTC is reset.
1. Erase the DTC.
2. Drive the vehicle at 12 mph (20 km/h) or higher.
  NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher.
Q: Is DTC C1046 set?
1. YES: Replace the wheel speed sensor < FL > (Refer to WHEEL SPEED SENSOR ). Then go to Step 12.
2. NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
STEP 12. Check whether the DTC is reset.
1. Erase the DTC.
2. Drive the vehicle at 12 mph (20 km/h) or higher.
  NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher.
Q: Is DTC C1046 set?
1. YES: Replace the hydraulic unit (integrated with ASC-ECU) (Refer to HYDRAULIC UNIT ). Then go to Step 13.
2. NO: The procedure is complete.
STEP 13. Check whether the DTC is reset.
1. Erase the DTC.
2. Drive the vehicle at 12 mph (20 km/h) or higher.
  NOTE: The ABS warning light does not turn OFF in some cases unless the vehicle runs at 12 mph (20 km/h) or higher.
Q: Is DTC C1046 set?
1. YES: Return to Step 1.
2. NO: The procedure is complete.