LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Plymouth >> 1980 >> Arrow Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Electronic Ignition >> Testing >> Electronic Control Unit Ground Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
scientia non olet · About LEMON Manuals