Diagnostic Aids
If Code 52 was set, engine oil life monitor system has been calculating engine oil life using false information. Oil life monitor must be reset and engine oil and filter changed. A scan tester will read engine oil temperature comparable to MAT or CTS when engine is cold. Temperature reading on tester should rise as engine oil temperature increases. If Code 52 is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.
To reset oil life monitor, turn ignition on. Depress and release ENG MET button on trip monitor. Within 5 seconds, depress and release ENG MET button again. Within 5 seconds, depress and hold RANGE button on trip monitor. CHANGE OIL light should flash.
Hold RANGE button until CHANGE OIL light stops flashing. When light goes out, engine oil life monitor is reset. This should take about 10 seconds. If light does not reset, turn ignition off, and repeat procedure.