As monitoring the errors of several sensors and actuators circuit,if any problem occurs, PCM turns engine check lamp ON at cluster to notify driver occurence of a problem.Generally, engine check lamp turns ON at Ignition ON and turns OFF within couple of seconds after turning engine ON. If engine check lamp turns on during driving, perform diagnosis of engine system and auto-transaxle system.
Checking input signal of engine check lamp every 10 sec. under detecting condition, if open, or short to battery or ground is detected for more than 5 sec., PCM sets P0650.
Item
Detecting Condition
Possible cause
DTC Strategy
? Signal low, high
? Poor connection
? Open or short in MIL circuit
? Faulty MIL
? Faulty PCM
Enable Conditions
? After 0.5 sec under conditions below
? Engine works
? 11V = Battery voltage = 16V
Threshold value
? Open or short
Diagnosis Time
? Continuous (More than 5 seconds failure for every 10 seconds test)
MIL On Condition
? DTC only (NO MIL ON)