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Home >> Mitsubishi >> 2005 >> Eclipse GT, Standard >> Repair and Diagnosis >> Restraints >> Passive Restraints >> Supplemental Restraint System >> Diagnostic Trouble Code Procedures >> Symptom Procedures >> Diagnosis

Symptom Procedures: Diagnosis

Required Special Tools: 

  1. STEP 1. Check that the scan tool can communicate with the other systems. 

    Q: Can the scan tool communicate with the other systems? 

    1. YES:  Go to Step 2.
    2. NO:  Refer to SYMPTOM PROCEDURES or SYMPTOM PROCEDURES .
  2. STEP 2. Check the communication line between the SRS-ECU and the scan tool. 
    1. Disconnect SRS-ECU connector C-72 and data link connector C-29 and measure at the wiring harness side.
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
      Fig 1: Identifying SRS-ECU Connector C-72
      G02462002Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 2: Identifying Connector C-29
      G02462003Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Check for continuity between the following terminals.
      • SRS-ECU connector C-72 (terminal No. 16) and data link connector C-29 (terminal No.7)
      • Should be less than 2 ohms.
        • Fig 3: Measuring Continuity Between SRS-ECU Connector C-72 And Data Link Connector C-29 Terminals
        G02462004Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Does continuity exist? 

    1. YES:  Go to Step 3.
    2. NO:  Go to  Step 5.
  3. STEP 3. Check the ground circuit to the SRS-ECU. 
    1. Disconnect SRS-ECU connector C-72, and measure at the wiring harness side.
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
      Fig 4: Identifying SRS-ECU Connector C-72
      G02462005Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Check for continuity between terminals 3 and body ground.
      • Should be less than 2 ohms.
        • Fig 5: Checking Continuity Between Terminals 3 And Body Ground
        G02462006Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Does continuity exist? 

    1. YES:  Go to Step 4.
    2. NO:  Go to  Step 6.
  4. STEP 4. Check the power supply circuit to the SRS-ECU. 
    1. Disconnect the negative battery terminal.
    2. Disconnect SRS-ECU connector C-72, and measure at the wiring harness side.
      Fig 6: Identifying SRS-ECU Connector C-72
      G02462007Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Connect the negative battery terminal.
    4. Turn the ignition switch to the "ON" position.
      CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
    5. Measure the voltage between terminals 9,12 and body ground
      • Voltage should measure 9 volts or more.
        Fig 7: Measuring Voltage Between Terminals 9, 12 And Body Ground
        G02462008Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured voltage within the specified range? 

    1. YES:  Replace SRS-ECU (Refer to HARNESS CONNECTOR  ). Then go to  Step 8.
    2. NO:  Go to  Step 7.
  5. STEP 5. Check the harness wires between SRS-ECU connector C-72 (terminal No.16) and data link connector C-29 (terminal No.7). 
    Fig 8: Identifying SRS-ECU Connector C-72
    G02462009Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 9: Identifying Connector C-29
    G02462010Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    NOTE: After inspecting intermediate connector C-77 inspect the wiring harness. If the intermediate connector C-77 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION .Than go to  Step 8.
    Fig 10: Identifying Connector C-77
    G02462011Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the harness wires between SRS-ECU connector C-72 (terminal No.16) and data link connector C-29 (terminal No.7) in good condition? 

    1. YES:  Go to  Step 8.
    2. NO:  Repair the harness wires between SRS-ECU connector C-72 and data link connector C-29. Then go to  Step 8.
  6. STEP 6. Check the harness wires between SRS-ECU connector C-72 (terminal No.3) and ground. 
    Fig 11: Identifying SRS-ECU Connector C-72
    G02462012Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the harness wires between SRS-ECU connector C-72 (terminal No.3) and ground in good condition? 

    1. YES:  Go to  Step 8.
    2. NO:  Repair the harness wires between SRS-ECU connector C-72 and ground. Then go to  Step 8.
  7. STEP 7. Check the harness wires between SRS-ECU connector C-72 (terminal No.9 and 12) and ignition switch (IG1). 
    Fig 12: Identifying SRS-ECU C-72 Connector Terminal
    G02462013Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    NOTE: After inspecting junction block connectors C-108, C-111, inspect the wiring harness.

    If the intermediate connectors C-108, C-111 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION .

    Fig 13: Locating Junction Block Connectors C-108, C-111
    G02462014Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Go to Step 8.

    Q: Are the harness wires between SRS-ECU connector C-72 (terminal No.9 and 12) and ignition switch (IG1) in good condition? 

    1. YES:  Go to Step 8.
    2. NO:  Repair the harness wires between SRS-ECU connector C-72 and ignition switch (IG1). Then go to Step 8.
  8. STEP 8. Retest the system. 

    Q: Does the scan tool communicate normally with the SRS system? 

    1. YES:  The procedure is complete (If no malfunctions are not found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
    2. NO:  There is no action to be taken.
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