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Home >> Lincoln >> 1983 >> Town Car Base >> Repair and Diagnosis >> Engine Performance >> System >> 5.0L MCU Testing >> Diagnosis & Testing >> Functional Test >> Key On, Engine Off (KOEO) Test
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Key On, Engine Off (KOEO) Test

Turn key on, but do not start engine. Watch voltmeter for code pulses which should appear within 5-30 seconds. Ignore any initial surge of voltage when ignition is turned on. Record code(s) and repair any problems indicated by codes.

NOTE: If voltmeter and vacuum gauge do not pulse, or show steady high or low readings, see No Self-Test Output.
Fig 1: Connections for Functional Test
G200
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