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Electronic Control Unit Ground Circuit

  1. On V8 and 6 cylinder models, connect one ohmmeter lead to a known good ground and the other lead to control unit pin "5". Ohmmeter should show full continuity. If not, make sure control unit is making good contact at hold-down bolts. If it is, replace control unit.
  2. On 4 cylinder models, disconnect distributor 3-wire connector. Connect ohmmeter lead to pin "2" on harness side of connector and the other lead to a known good ground. Full continuity should be indicated. If not, unplug connector at control unit. Connect ohmmeter lead to control unit pin "4". If correct reading is obtained here, make sure control unit is making good contact at hold-down bolts. If reading is still not correct, replace control unit.
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