X-90 (4WD) L4-1591cc 1.6L SOHC MFI (1998)
Malfunction Indicator Lamp: Testing and Inspection
Chart A-1 Malfunction Indicator Lamp Circuit Check
LAMP DOES NOT COME "ON" AT IGNITION SWITCH ON (BUT ENGINE AT STOP)
Wiring Diagram
Chart A-1
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, Electronic Control Module (ECM) causes the main relay to turn ON (close the contact point). Then, ECM
being supplied with the main power, turns ON the Malfunction Indicator Lamp (MIL). When the engine starts to run and no malfunction is detected in
the system, MIL goes OFF but if a malfunction was or is detected, MIL remains ON even when the engine is running.