Montero Sport LS 2WD V6-3.0L SOHC (1998)
Data Link Connector: Testing and Inspection
Check Engine Light Does Not Come On
Description and Fault Judgement Criteria
DESCRIPTION AND FAULT JUDGEMENT CRITERIA
CIRCUIT OPERATION
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The check engine/malfunction indicator lamp power is supplied from the ignition switch.
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The ECM controls the ground of the check engine/malfunction indicator lamp by turning the power transistor in the ECM "ON" and "OFF."
COMMENT
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The ECM causes the check engine/malfunction indicator lamp to illuminate for 5 seconds immediately after the ignition switch is turned to
"ON" occurred.
Diagnosis
3. THE CHECK ENGINE/MALFUNCTION INDICATOR LAMP DOES NOT ILLUMINATE RIGHT AFTER THE IGNITION SWITCH IS
TURNED TO THE "ON" POSITION
TROUBLESHOOTING HINTS
The most likely causes for this case:
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Burnt-out bulb.
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Defective check engine/malfunction indicator lamp circuit.
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Malfunction of the ECM.
DIAGNOSIS
Required Special Tool: MB991502 Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 16: Power Supply Voltage.
