Diagnostic Aids

This DTC may be set due to either mechanical faults or electrical circuit faults. Possible causes are:

• Weakened springs in throttle assembly.
• Throttle plate forced to extreme position due to a surge of air or carbon deposits.
• Circuit failure to throttle control motor.
• TP sensor not functioning properly (diagnose TP sensor DTCs first).
• Throttle body assembly faulty.

If DTC is set, ECM detected a fault with back-up throttle control system in reduced performance mode. If condition is a hard fault, engine will not restart once ignition is cycled off.