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Inspection Procedure A-2: Communication With The Column Switch (Column-Ecu) Is Impossible: Diagnosis

  1. Use Scan Tool To Select "ECU Check" On The SWS Monitor Display -  Check the following ECUs:
    • ETACS-ECU
    • Column-ECU
      CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector. See Fig 1.
      Fig 1: Connecting Scan Tool To Data Link Connector
      G00369166Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Connect SWS monitor kit MB991862 to the column switch connector. See Figure.
    3. When the ignition switch is turned to the "LOCK" (OFF) position, scan tool MB991502 should show "OK" on the "ECU CHECK" menu.
    Are "OK" displayed on the "ETACS ECU" and "COLUMN ECU" menus?
  2. Check Column Switch Connector C-86 For Damage -  See Fig 2. Is column switch connector C-86 in good condition?
    • YES : Go to next step.
    • NO : Repair or replace the connector. The system should communicate with the column switch (column-ECU) normally.
    Fig 2: Locating Column Switch Connector C-86
    G00369168Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. Check At Column Switch Connector C-86 By Backprobing In Order To Check The Power Supply Circuit To The Column Switch (Through The Battery) - 
    1. Measure at column switch connector C-86 without disconnecting the connector.
    2. Measure the voltage between terminal 1 and ground by backprobing. See Fig 3. The measured value should be approximately 12 volts (battery positive voltage).
      Fig 3: Checking Power Supply Circuit To Column Switch
      G00369169Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Does the measured voltage correspond with this range?
    • YES : Go to step  6.
    • NO : Go to next step.
  4. Check Column Switch Connector C-86 For Damage -  Is column switch connector C-86 in good condition?
    • YES : Go to next step.
    • NO : Repair or replace the connector. The system should communicate with the column switch (column-ECU) normally.
  5. Check The Wiring Harness Between Column Switch Connector C-86 And The Battery -  Also check joint connector C-78 and intermediate connector C-89. See Fig 4. If joint connector C-78 or intermediate connector C-89 is damaged, repair or replace the connector. Is the wiring harness between column switch connector C-86 and the battery in good condition?
    • YES : No action to be taken.
    • NO : Repair the wiring harness. The system should communicate with the column switch (column-ECU) normally.
    Fig 4: Locating Joint Connectors C-42 & C-78, & Intermediate Connector C-89
    G00218588Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. Measure At Column Switch Connector C-86 In Order To Check The Ground Circuit To The Column Switch - 
    1. Disconnect column switch connector C-86, and measure at the wiring harness side.
    2. Measure the resistance value between terminal 4 and ground. See Fig 5. The measured value should be 2 ohm or less.
      Fig 5: Checking Ground Circuit To Column Switch
      G00369170Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Does the measured resistance value correspond with this range?
    • YES : Go to step  9.
    • NO : Go to next step.
  7. Check Column Switch Connector C-86 For Damage -  Is column switch connector C-86 in good condition?
    • YES : Go to next step.
    • NO : Repair or replace the connector. The system should communicate with the column switch (column-ECU) normally.
  8. Check The Wiring Harness Between Column Switch Connector C-86 And Ground -  Also check joint connector C-78. If joint connector C-78 is damaged, repair or replace the connector. Is the wiring harness between column switch connector C-86 and the ground in good condition?
    • YES : No action to be taken.
    • NO : Repair the wiring harness. The system should communicate with the column switch (column-ECU) normally.
  9. Check Column Switch Connector C-86 And ETACS-ECU Connector C-118 For Damage -  Are column switch connector C-86 and ETACS-ECU connector C-118 in good condition?
    • YES : Go to next step.
    • NO : Repair or replace the connector. The system should communicate with the column switch (column-ECU) normally.
  10. Check The Wiring Harness Between Column Switch Connector C-86 And ETACS-ECU Connector C-118 -  Also check joint connector C-78. See Fig 4. If joint connector C-78 is damaged, repair or replace the connector. Is the wiring harness between column switch connector C-86 and ETACS-ECU connector C-118 in good condition?
    • YES : Go to step  13.
    • NO : Repair the wiring harness. The system should communicate with the column switch (column-ECU) normally.
  11. Check Column Switch Connector C-86 And ETACS-ECU Connector C-118 For Damage -  see Figure. Are column switch connector C-86 and ETACS-ECU connector C-118 in good condition?
    • YES : Go to next step.
    • NO : Repair or replace the connector. The system should communicate with the column switch (column-ECU) normally.
  12. Check The Wiring Harness Between Column Switch Connector C-86 And ETACS-ECU Connector C-118 -  Is the wiring harness between column switch connector C-86 and ETACS-ECU connector C-118 in good condition?
    • YES : Go to next step.
    • NO : Repair the wiring harness. The system should communicate with the column switch (column-ECU) normally.
  13. Replace The ETACS-ECU - 
    1. Replace the column switch.
    2. The system should communicate with the column switch (column-ECU) normally.
    Can the system communicate with the column switch (column-ECU)?
    • YES : No action to be taken.
    • NO : Replace the ETACS-ECU. The system should communicate with the column switch (column-ECU) normally.
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