Probable Causes:

Loose Engine Ground
Open E1 Circuit
Open Injector Circuit
Fuel Line Pressure (Blocked Injector)
Open Or Short In Oxygen Sensors Or Circuits
Ignition System
Coolant Temperature Sensor
Airflow Meter Or Air Intake System
ECM

For oxygen sensor or circuit testing, see CODE 21 - O2 SENSOR SIGNAL test procedures in this article. For injector or circuit testing, see TEST NO. 9 - INJECTOR CIRCUIT in this article.

NOTE: Diagnostic chart is not available from manufacturer.