Control Unit Power Feed

NOTE: Always check ignition coil primary circuit first before making this check.

Disconnect 2-wire connector at control unit. Connect voltmeter negative lead to ground and positive lead to harness connector terminal "F2". Turn ignition on. Voltage reading should be within .2 volt of battery voltage. If reading is correct, replace control unit and go to step 3).
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 but no spark at coil wire, replace control unit.
Turn ignition off and connect 2-wire connector. Disconnect 4-wire connector and connect an ammeter between Black wire terminal "C1" of control unit connector and ground. Turn ignition on. Reading should be .9-1.1 amps. If reading is not as specified, replace control unit.