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Home >> Mitsubishi >> 2014 >> Lancer GT >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Keyless Operation System (Kos) - With Diagnostics) >> Diagnosis < OSS-Ecu > >> Symptom Procedures >> Inspection Procedure 1: Abnormality in OSS-ECU power supply and ground circuit >> Diagnosis

Inspection Procedure 1: Abnormality in OSS-ECU power supply and ground circuit: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Resistance measurement at OSS-ECU connector (PGND terminal) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the OSS-ECU connector (PGND terminal) and body ground.

      OK: Continuity exists (2 Ω or less) 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 3.
    2. NO:  Go to Step 2.
  2. STEP 2. Check of open circuit in PGND line between OSS-ECU connector and ground joint connector 
    NOTE: Before the wiring harness check, check the joint connector, and repair if necessary.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Repair the connector(s) or wiring harness.
  3. STEP 3. Resistance measurement at OSS-ECU connector (SGND terminal) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the OSS-ECU connector (SGND terminal) and body ground.

      OK: Continuity exists (2 Ω or less) 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 5.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of open circuit in SGND line between OSS-ECU connector and ground joint connector 

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Repair the connector(s) or wiring harness.
  5. STEP 5. Voltage measurement at OSS-ECU connector (+B1 terminal) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Check the voltage between the OSS-ECU connector (+B1 terminal) and body ground.

      OK: System voltage 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 7.
    2. NO:  Go to Step 6.
  6. STEP 6. Check of short to power supply, short to ground, and open circuit in +B1 line between fusible link and OSS-ECU connector 
    NOTE: Before the wiring harness check, check the ETACS-ECU connector and joint connector, and repair if necessary.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Repair the connector(s) or wiring harness.
  7. STEP 7. Voltage measurement at OSS-ECU connector (+B2 terminal) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Check the voltage between the OSS-ECU connector (+B2 terminal) and body ground.

      OK: System voltage 

    Q: Is the check result normal? 

    1. YES:  Replace the OSS-ECU and register the VIN (Refer to REGISTRATION WHEN REPLACING OSS-ECU  ).
    2. NO:  Go to Step 8.
  8. STEP 8. Check of short to power supply, short to ground, and open circuit in +B1 line between fusible link and OSS-ECU connector 
    NOTE: Before the wiring harness check, check the ETACS-ECU connector and joint connector, and repair if necessary.

    Q: Is the check result normal? 

    1. YES:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    2. NO:  Repair the connector(s) or wiring harness.
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