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Home >> Lexus >> 1995 >> ES 300 V6-3.0L (1MZ-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> Component Tests and General Diagnostics >> Back Up Power Source Circuit
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Back Up Power Source Circuit

CIRCUIT DESCRIPTION
Battery voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for use by the diagnostic trouble code memory and air-fuel ratio adaptive control value memory, etc.




HINT: If DTC P1600 appears, the ECM is not able to store another diagnostic trouble code.

ECM Back-up Power Supply Circuit:




WIRING DIAGRAM







INSPECTION PROCEDURE
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