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Home >> American Motors >> 1982 >> Spirit Base, 2D Hatchback, 4.2L Eng VIN C, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> MOTORCRAFT Solid State Ignition System >> Testing >> Control Unit Power Feed Check

Control Unit Power Feed Check

NOTE: Before making this check, always check ignition coil primary circuit first.
  1. Disconnect 2-wire connector (Red and White wires) at control unit. Connect voltmeter negative lead to ground and positive lead to Red wire harness connector terminal "F2". Turn ignition switch "ON". Voltage reading should be within 0.2 volts of battery voltage. If reading is correct, replace control unit and proceed to step  3).
  2. If reading is not correct, locate and repair cause of voltage reduction (corroded connectors, defective ignition switch, etc.). If connectors are repaired and there is spark at coil wire, start engine. If connectors are repaired and there is no spark at coil wire, replace control unit.
  3. Turn ignition switch "OFF", connect 2-wire connector and disconnect 4-wire connector. Connect an ammeter to Black wire terminal "C1" of control unit connector and to ground. Turn ignition switch "ON". Reading should be 0.9-1.1 amps. If reading is higher or lower than specified, replace the control unit.
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