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Home › Merkur › 1987 › XR4Ti Standard › Repair and Diagnosis › Engine Performance › System › 2.3L Turbo EEC IV Tests › Circuit Tests › Circuit Test GG

Circuit Test GG

  1. Use only VOM/DVOM, not STAR tester for this step. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to positive battery terminal. Install a jumper wire between STI and signal return at SELF-TEST connector.
  2. Perform KEY ON/ENGINE OFF SELF-TEST until end of CONTINUOUS SELF-TEST codes (DVOM reads zero volts). Depress and release throttle while watching DVOM reading. If reading did not change to a high voltage, depress throttle to WOT position and release.
  3. If STO voltage does not go to high reading, go to CIRCUIT TEST NN  , step 17). Leave test equipment connected. If reading changes to high voltage, remain in OUTPUT STATE CHECK and go to next step.
  4. Turn key on and leave engine off. Disconnect ECA 60-pin connector and inspect for damage, corrosion or loose wires. Repair as necessary. Connect breakout box to harness and reconnect ECA. Place A/C switch to the A/C position. Set DVOM to 20-volt scale.
  5. Connect DVOM positive lead to test pin No. 37 and negative lead to test pin No. 54 at the breakout box. While monitoring DVOM, depress and release throttle several times to cycle output on and off.
  6. If A/C clutch output cycle goes on and off, EEC-IV system checks okay and A/C system needs to be checked. If on and off does not occur, remove jumper wire and proceed to next step.
  7. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Set DVOM to 200,000 ohm scale. Measure resistance between test pin No. 54 and test pins No. 40, 46 and 60, at breakout box.
  8. If resistance reading is 10,000 or greater, replace ECA and repeat QUICK TEST  . If resistance reading is less than specification, proceed to next step.
  9. Turn key off and wait 10 seconds. Set DVOM to 200 ohm scale. Disconnect WAC relay connector and measure relay resistance. If resistance is not between 50 and 70 ohms, replace WAC relay and repeat QUICK TEST  . If resistance is between 50 and 70 ohms, connect WAC solenoid and proceed to next step.
  10. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for damage, corrosion or loose wires. Repair as necessary. Connect breakout box to harness and leave ECA disconnected.
  11. Set DVOM to 200 ohm scale. Measure resistance between test pin No. 54 at breakout box and WAC circuit at harness connector. If resistance is 5 ohms or greater, repair open circuit in harness and repeat QUICK TEST  . If resistance is not 5 ohms or greater, proceed to next step.
  12. Turn key off and wait 10 seconds. Leave breakout box connected and ECA disconnected. Set DVOM to 200,000 ohm scale. Measure resistance between test pin No. 54 and test pins No. 40, 46 and 60, at breakout box. If resistance readings are not greater than 10,000 ohms, repair short to ground and repeat QUICK TEST  . If resistance is greater than 10,000 ohms, proceed to next step.
  13. Turn key off and wait 10 seconds. Disconnect ECA. Set DVOM to 20-volt scale. Measure voltage between test pin No. 10 and test pin No. 40 at breakout box. If output cycles low to high (high being 10.5 volts or greater), when A/C switch is cycled, replace ECA and repeat QUICK TEST  . If cycle not within specifications, repair open in A/C input to test pin No. 10 and repeat QUICK TEST  .
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