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Home >> Mitsubishi >> 1993 >> Eclipse Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Motors, Relays & Solenoids >> Relays >> MPI Control Relay (Eclipse 2.0L)
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MPI Control Relay (Eclipse 2.0L)

  1. This step checks ignition supply voltage to ECM. Disconnect ECM harness connector. Turn ignition on. Using DVOM, measure voltage between ECM harness connector terminal No. 110 and vehicle ground. See Figure and Figure . If voltage is battery voltage, go to step 2. If voltage is not battery voltage, check and repair circuit between ignition switch and ECM harness connector.
  2. This step checks battery supply voltage of control relay. Using DVOM, measure voltage between terminal No. 10 of relay harness connector and vehicle ground. See Figure . If voltage is battery voltage, go to step 3. If voltage is not battery voltage, check and repair circuit between battery and control relay.
  3. This step checks continuity of circuit between control relay and ECM. Disconnect ECM connector. Using DVOM, check continuity between control relay harness connector terminal No. 8 and ECM connectors No. 63 and 66. If continuity exists, go to step 4. If continuity does not exist, check and repair circuits between control relay harness connector and ECM.
  4. This step checks continuity of circuit between control relay and ECM. Check continuity between control relay harness connector terminal No. 4 and ECM harness connector terminals No. 102 and 107. If continuity exists, go to step 5. If continuity does not exist, check and repair circuits between control relay harness connector and ECM.
  5. This step checks continuity of circuit between control relay and ECM. Disconnect ECM connector. Using DVOM, check continuity between control relay harness connector terminal No. 5 and ECM harness connector terminals No. 102 and 107. If continuity exists, harness is okay. Go to step 6. If continuity does not exist, check and repair circuits between control relay harness connector and ECM.
  6. Connect 12-volt power source between relay terminals No. 8and 10. Connect positive lead to terminal No. 10. With relay energized, battery voltage should exist between terminals No. 4 and 8 and between terminals No. 5 and 8. With power source removed, voltage should not exist.
  7. Move 12-volt power source to relay terminals No. 6 and 9. Connect positive lead to terminal No. 9. With relay energized, continuity should exist between terminals No. 2 and 3. With power source removed, continuity should not exist.
  8. Move 12-volt power source to relay terminals No. 3 and 7. Connect positive lead to terminal No. 3. With relay energized, battery voltage should exist between terminals No. 2 and 7. With power source removed, voltage should not exist. Replace control relay if any measurements are not as specified.
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