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ECS Indicator Light Doesn't Change As ECS Switch Is Operated

  1. Turn ignition on. If ECS indicator light is not flashing, go to next step. If ECS indicator light is flashing, self-diagnostic system has detected a fault and stored a trouble code. See SELF-DIAGNOSTIC SYSTEM  and RETRIEVING CODES  under TESTING & DIAGNOSIS.
  2. Remove ECS switch. See ECS SWITCH  under REMOVAL & INSTALLATION. Using an ohmmeter, check for continuity between ground and ECS switch harness connector terminal No. 11 (Black wire). See Fig 1.
    Fig 1: Identifying ECS Switch Connector Terminals
    G92H00734Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. If continuity is present, go to next step. If continuity is not present, repair Black wire between ECS switch harness connector terminal No. 11 and ground.
  4. Turn ignition on. Measure voltage between ground and ECS switch harness connector terminal No. 10 (Red/Black wire). See Fig 1. If voltage is not 5 volts, go to next step. If voltage is 5 volts, go to step 6).
  5. Turn ignition off. Using an ohmmeter, check continuity between ECS switch harness connector terminal No. 10 and ECS control unit harness connector terminal No. 1. See Figure and Fig 1. Repair harness if continuity is not present. If continuity is present, replace ECS control unit.
  6. Test ECS switch. See ECS SWITCH  under COMPONENT TESTING. Replace switch if necessary. If switch is okay, check for a burned out ECS indicator light bulb. Replace bulb as necessary. If bulb is okay, go to next step.
  7. Using an ohmmeter, check for continuity between combination meter harness connector terminal No. 10 (White/Orange wire) and ECS control unit harness connector terminal No. 2 (White/Orange wire). See Figure and Fig 2. Repair harness if continuity is not present. If continuity is present, go to next step.
    Fig 2: Identifying Combination Meter Connector Terminals
    G92I00735Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. Check for continuity between combination meter harness connector terminal No. 11 (White/Black wire) and ECS control unit harness connector terminal No. 3 (White/Black wire). See Figure and Fig 2. Repair harness if continuity is not present. If continuity is present, go to next step.
  9. Check for continuity between ground and combination meter harness connector terminal No. 2 (Black/Yellow wire). See Fig 2. Repair harness if continuity is not present. If continuity is present, go to next step.
  10. Replace combination meter with a known good unit. Check ECS indicator light operation. If ECS indicator light operates correctly, replace combination meter. If ECS indicator light still does not operate correctly, replace ECS control unit.
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