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MPI Control Relay (Eclipse 1.8L)

  1. This step checks ignition switch supply voltage of control relay. Disconnect control relay connector. Turn ignition on. Measure voltage between terminal No. 8 of relay harness connector and vehicle ground. See Figure . If voltage is battery voltage, go to step 2. If voltage is not battery voltage, check and repair circuit between ignition switch and control relay.
  2. This step checks continuity of control relay ground circuit. Turn ignition off. Using DVOM, check continuity between control relay harness connector terminal No. 6 and vehicle ground. If continuity exists, go to step 3. If continuity does not exist, check and repair circuit between control relay and vehicle ground.
  3. This step checks battery supply voltage of control relay. Using DVOM, measure voltage between terminal No. 4 of relay harness connector and vehicle ground. If voltage is battery voltage, go to step 4. If voltage is not battery voltage, check and repair circuit between battery and control relay.
  4. 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. 2 and ECM harness connector terminals No. 102 and 107. See Figure , Figure and Figure .
  5. 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. Check continuity of control relay. Removal of relay may assist in testing. Measure resistance between terminals No. 2 and 5 and between terminals No. 3 and 5. Resistance should be about 95 ohms. Measure resistance between terminals No. 6 and 7. Resistance should be about 35 ohms. Measure resistance between terminals No. 6 and 8. Continuity should exist in only one direction. Replace control relay if measurements are not as specified.
  7. Connect 12-volt power source between relay terminals No. 6 and 7. Connect positive lead to terminal No. 7. With relay energized, continuity should exist between terminals No. 1 and 4. With power source removed, continuity should not exist.
  8. Move 12-volt power source to relay terminals No. 2 and 5. Connect positive lead to terminal No. 2. With relay energized, continuity should exist between terminals No. 1 and 4. With power source removed, continuity should not exist.
  9. Move 12-volt power source to relay terminals No. 6 and 8. Connect positive lead to terminal No. 8. With relay energized, continuity should exist between terminals No. 2 and 4. With power source removed, continuity should not exist. Replace control relay if any measurements are not as specified.
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