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Home >> Mitsubishi >> 1997 >> Eclipse Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.4L >> Diagnostic Tests >> Scan Tool Will Not Communicate >> No Communication With PCM
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No Communication With PCM

  1. Check connectors and wiring harness between PCM and DLC and between PCM and power supply. If wiring and connectors are okay, check MFI relay. See RELAYS in SYSTEM/COMPONENT TESTS - 2.4L article. If MFI relay is okay, go to next step.
  2. Remove MFI relay. Check voltage between ground and MFI relay connector terminal No. 3. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between MFI relay and battery.
  3. Check voltage between ground and MFI relay connector terminal No. 4. If battery voltage exists, go to step 5). If battery voltage does not exist, check wiring harness between MFI relay and battery.
  4. Disconnect PCM connector.
  5. Check voltage between ground and PCM connector terminal No. 38. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors and wiring harness between PCM and MFI relay.
  6. Check continuity between ground and PCM connector terminals No. 13 and 26. If continuity exists, go to next step. If continuity does not exist, check wiring harness between ground and PCM.
  7. Check voltage between ground and PCM connector terminal No. 80. If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM. If battery voltage does not exist, check wiring harness between PCM and battery.
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