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Home >> Ford >> 1993 >> Probe Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EEC-IV >> Ignition System >> Pinpoint Test G
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Pinpoint Test G

  1. Talk to vehicle operator to determine symptoms. Review vehicle service history, including previous repairs and components replaced. If engine starts, go to step 2). If engine does not start, go to PINPOINT TEST A.
  2. Wiggle Test  With engine at idle, wiggle wiring harness and pull wires at ignition component connectors. If engine stalls, service harness and connectors as necessary. Check ICM mounting bolts. Repeat QUICK TEST, and service any codes present. If engine does not stall or miss, go to step 3).
  3. Engine Warm Up  Start engine and put A/C blower on medium. Close hood and allow engine to idle for 15 minutes. If engine stops, go to step 7). If engine does not stop, go to step 4).
  4. Hot Restart Check  Turn ignition off. Wait 10 minutes and attempt to restart engine. If engine does not restart, go to PINPOINT TEST A. If engine does restart, go to step 5).
  5. With engine at idle, raise hood, and perform wiggle test on connectors of primary ignition components. If engine quits, service harness or connector as necessary. If engine does not quit, go to step 6).
  6. Road Test  Road test vehicle. If engine quits, go to step 7). If engine does not quit, test is complete.
  7. Wiggle wiring harness and pull wires at connectors. If engine quits, service or repair harness or connector. Turn ignition off. Separate and reconnect connectors for ignition components. If engine starts, repair or replace connector(s) as necessary. If engine does not start, go to step 8).
  8. Check Sensor Shield  Turn ignition off. Spray light mist of water on wiring harness and connectors. Measure resistance between sensor shield (find exposed shield in sensor cable) and negative battery terminal. If resistance is less than 5 ohms, go to PINPOINT TEST A. If resistance is 5 ohms or more, service or repair shield ground circuit.
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