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Home >> Mercury >> 1982 >> Capri Black Magic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MCU Engine Control System >> Diagnosis & Testing >> Functional Test >> Key On, Engine Off Test

Key On, Engine Off Test

Turn key on, but do not start engine. Watch voltmeter for code pulses which should appear in approximately 5 seconds. Ignore any initial surge of voltage when key is turned on. Record code (s).

NOTE: If voltmeter does not pulse, but shows steady high or low readings, see test 14 (4 and 6 cylinder) or 29 (V8).
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