Galant LS V6-3.0L 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 PCM controls the ground of the service engine soon/malfunction indicator lamp by turning the power transistor in the PCM "ON" and "OFF".
COMMENT
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In cases such as the above, the cause is probably that the PCM 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 PCM.
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Malfunction of the PCM.
WIRING DIAGRAM