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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Keyless Operation System (Kos) - With Diagnostics) >> Diagnosis < Kos-Ecu > >> Symptom Procedures >> Inspection Procedure 3: Abnormality in KOS-ECU power supply and ground circuits >> Diagnosis

Inspection Procedure 3: Abnormality in KOS-ECU power supply and ground circuits: 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 KOS-ECU connector (GND line) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the KOS-ECU connector (GND line) 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 GND line between KOS-ECU connector and body ground 

    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. Voltage measurement at KOS-ECU connector (IG1 line) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Check the voltage between the KOS-ECU connector (IG1 line) and body ground.

      OK: System voltage 

    Q: Is the check result normal? 

    1. YES:  Go to  Step 5.
    2. NO:  Go to Step 4.
  4. STEP 4. Check of short to power supply, short to ground, and open circuit in IG1 line between ETACS-ECU connector and KOS-ECU 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 KOS-ECU connector (PWR line) 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Check the voltage between the KOS-ECU connector (PWR terminal) and body ground.

      OK: System voltage 

    Q: Is the check result normal? 

    1. YES:  Replace the KOS-ECU and register the chassis number (Refer to REGISTRATION WHEN REPLACING OSS-ECU  ).
    2. NO:  Go to Step 6.
  6. STEP 6. Check of short to power supply, short to ground, and open circuit in PWR line between fusible link (4) and KOS-ECU 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.
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