1999 Suzuki Vitara 1.6L & 2.0L ENGINE PERFORMANCE Self-Diagnostics
CIRCUIT TEST A-1: MALFUNCTION INDICATOR LIGHT (MIL)
With ignition on, PCM energizes main relay. As PCM is supplied ignition power, MIL illuminates. After engine starts, MIL turns off if no malfunction is detected. If a malfunction is detected, MIL will remain illuminated until system is repaired.
1) Turn ignition on. Observe instrument cluster warning lights. If all warning lights illuminate except for MIL, go to next step. If no warning lights illuminate, check for blown fuses, faulty ignition switch, or poor connection at instrument cluster. Repair as necessary.
2) Attempt to start engine. If engine does not start, go to CIRCUIT TEST A-3: PCM POWER & GROUND CIRCUIT CHECK/ENGINE NO START. If engine starts, turn ignition off and disconnect PCM harness connectors. Go to next step.
3) Connect a fused jumper wire between ground and terminal No. 34 (Purple/Yellow wire) at 35-pin PCM harness connector. Turn ignition on. If MIL illuminates, replace PCM. If MIL does not illuminate, check for faulty MIL bulb or open in Purple/Yellow wire. Repair as necessary and retest system.
CIRCUIT TEST A-2: MALFUNCTION INDICATOR LIGHT (MIL) REMAINS ith ignition on, PCM energizes main relay. As PCM is supplied ignition power, MIL illuminates. After engine starts, MIL turns off if no malfunction is detected. If a malfunction is detected, MIL will remain illuminated until system is repaired.
1) Connect scan tool to Data Link Connector (DLC). Start engine and attempt to retrieve DTCs. If any DTCs are displayed, see DIAGNOSTIC TESTS. If no DTCs are displayed, go to next step.
2) Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. If MIL illuminates, repair short to ground in Purple/Yellow wire between MIL bulb and PCM harness connector. If MIL does not illuminate, replace PCM and retest system.
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