Montero Sport LTD 4WD V6-3.5L SOHC (1999)
Malfunction Indicator Lamp: Testing and Inspection
4. SES/MIL Lamp Remains Illuminated and Never Goes Out
CIRCUIT OPERATION
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The service engine soon/malfunction indicator lamp power is supplied from the ignition switch.
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The ECM <M/T>/PCM <A/T> controls the ground of the service engine soon/malfunction indicator lamp by turning the power transistor in the
ECM <M/T>/PCM <A/T> "ON" and "OFF."
COMMENT
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In cases such as the above, the cause is probably that the ECM <M/T>/PCM <A/T> is detecting a problem in a sensor or actuator or that one of
the malfunctions listed at right has probably occurred.
TROUBLESHOOTING HINTS
The most likely causes for this case:
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Short-circuit between the service engine soon/malfunction indicator lamp and ECM <M/T>/PCM <A/T>.
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Malfunction of the ECM <M/T>.
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Malfunction of the PCM <A/T>.
WIRING DIAGRAM