DTC C1205: Front Left Wheel Speed Sensor (Open Circuit or Short Circuit): Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: MUT-III USB Cable
  • MB991910: MUT-III Main Harness A
• MB991997: ASC Check Harness

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the CAN bus line found to be normal? 

   YES :  Go to  Step 3

   NO :  Repair the CAN bus line (Refer to, DIAGNOSIS ). Then go to Step 2.

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Recheck for diagnostic trouble code. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Turn the ignition switch to the "ON" position.
   2. Erase the DTC.
   3. Turn the ignition switch to the "LOCK" (OFF) position.
   4. Turn the ignition switch to the "ON" position.
   5. Check if the DTC is set.
   6. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is DTC C1205 set? 

   YES :  Go to Step 3

   NO :  The procedure is complete.

   Fig 2: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Using scan tool MB991958, check data list. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958 to the data link connector.
   2. Start the engine.
   3. Set scan tool MB991958 to the data reading mode, and check the data list items by driving the vehicle (Refer to DATA LIST REFERENCE TABLE ).
      • Item 02: Front left wheel speed sensor
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Does the speedometer indication match the scan tool indication? 

   YES :  It can be assumed that this malfunction is intermittent. Refer to, How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION .

   NO :  Go to Step 4.

   Fig 3: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Measure the voltage at ABS/TCL-ECU connector A-03. 
   1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/TCL-ECU.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 45 and body ground, and between terminal 46 and body ground. It should be 1V or less.

   Q: Does the voltage measure 1 V or less? 

   YES :  Go to Step 5.

   NO :  Go to  Step 7.

   Fig 4: Measuring Voltage Between Terminal 45 And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Measure the resistance at ABS/TCL-ECU connector A-03. 
   1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/TCL-ECU.
   2. Measure the resistance between terminal 45 and body ground, and between terminal 46 and body ground. There should be no continuity.

   Q: Does continuity exist? 

   YES :  Go to  Step 7.

   NO :  Go to Step 6.

   Fig 5: Measuring Resistance Between Terminals & Ground At Check Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Measure the resistance at the ABS/TCL-ECU connector A-03. 
   1. Disconnect the connector A-03, and connect special tool MB991997 to the wiring harness-side connector.
      NOTE: DO NOT connect special tool MB991997 to the ABS/TCL-ECU.
   2. Measure the resistance between the ABS/TCL-ECU connector terminals 45 and 46.

      Standard Value: 1.24 - 1.64 kΩ 

   Q: Is the resistance between terminals 45 and 46 within the standard value? 

   YES :  Go to  Step 10.

   NO :  Go to Step 7.

   Fig 6: Measuring Resistance Between ABS/TCL-ECU Connector Terminals 45 And 46 At Check Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check ABS/TCL-ECU connector A-03 and wheel speed sensor < front: LH > connector A-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are ABS/TCL-ECU connector A-03 and wheel speed sensor < front: LH > connector A-06 damaged? 

   YES :  Repair or replace the damaged component(s). Refer to, HARNESS CONNECTOR INSPECTION . Then go to  Step 11.

   NO :  Go to Step 8.

   Fig 7: Identifying Connector A-03 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 8: Identifying Wheel Speed Sensor Connector A-06

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
8. STEP 8. Check the harness wires between ABS/TCL-ECU connector A-03 (terminal 45, 46) and wheel speed sensor connector A-06 (terminal 2, 1). 

   Q: Is the harness wire between ABS/TCL-ECU connector A-03 (terminal 45, 46) and wheel speed sensor connector A-06 (terminal 2, 1) damaged? 

   YES :  Repair the wiring harness. Then go to  Step 11.

   NO :  Go to Step 9.

   Fig 9: Identifying Connector A-03 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 10: Identifying Wheel Speed Sensor Connector A-06

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Inspect the wheel speed sensor. 

   Check the front left wheel speed sensor relevant to the DTC code. For the applicable inspection procedure, refer to REMOVAL SERVICE POINT .

   Q: Is the wheel speed sensor damaged? 

   YES :  Replace the wheel speed sensor. Then go to  Step 11.

   NO :  It can be assumed that this malfunction is intermittent. Refer to, How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION .

10. STEP 10. Recheck for diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

    Check again if the DTC is set.

    1. Turn the ignition switch to the "ON" position.
    2. Erase the DTC.
    3. Turn the ignition switch to the "LOCK" (OFF) position.
    4. Turn the ignition switch to the "ON" position.
    5. Check if the DTC is reset.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1205 set? 

    YES :  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 11.

    NO :  It can be assumed that this malfunction is intermittent. Refer to, How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION .

    Fig 11: Connecting Scan Tool To Data Link Connector

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
11. STEP 11. Recheck for diagnostic trouble code. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Turn the ignition switch to the "ON" position.
    2. Erase the DTC.
    3. Turn the ignition switch to the "LOCK" (OFF) position.
    4. Turn the ignition switch to the "ON" position.
    5. Check if the DTC is set.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC C1205 set? 

    YES :  Repeat the troubleshooting from Step 1.

    NO :  The procedure is complete.

    Fig 12: Connecting Scan Tool To Data Link Connector

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.