On-Board Diagnostic System

1. To insure correct diagnosis, check to confirm that battery voltage is within standard value when engine is standstill.
2. Turn ON ignition switch and make sure that malfunction indicator lamp ("CHECK ENGINE" light) lights.
3. If engine will not start but cranking is possible, crank it for more than 3 seconds.
4. While ignition switch is ON, ground diagnosis switch terminal in monitor coupler and then read diagnostic trouble code (observe malfunction indicator lamp ("CHECK ENGINE" light)).





ECM indicates that no ignition fail safe signal is inputted while engine is running or being cranked. Refer to Computers and Control Systems/Testing and Inspection





ECM indicates that no CMP sensor signal is inputted for more than 3 seconds while engine is being cranked.
Refer to Computers and Control Systems/Testing and Inspection