The Electronic Control Module (ECM) detects one of the following conditions:
- The ECM has been powered for 3 seconds.
- Diagnostic code 0168-01 is not active.
- No 0262 diagnostic codes are active.
- The setting for the lower diagnostic limit has been exceeded for 1 second.
System Response:
If equipped, the warning lamp will come on. The diagnostic code will be logged.
The engine will use the primary throttle until the fault is repaired.
If the primary throttle has a fault, the following conditions will occur:
- The engine will default to the limp home speed.
- If the engine speed is higher than the limp home speed, the engine will decelerate to the limp home speed.
- If the engine speed is lower than the limp home speed, the engine speed will remain at the current speed.
- The engine will remain at this speed while the diagnostic code remains active.
- All inputs from the faulty throttle are ignored by the ECM until the fault is repaired.
- All inputs from the repaired throttle will be ignored by the ECM until the keyswitch has been turned to the OFF position and then back to the ON position.
Monitor the configuration screen on the electronic service tool in order to determine the type of throttle position sensor that is used on the engine.
If the engine is equipped with an analog secondary throttle, proceed to "Test Step 1".
If the engine is equipped with a digital secondary throttle, proceed to "Test Step 2".
Test Step 1. Perform the following diagnostic procedure: Analog Throttle Position Sensor Circuit - Test
Results:
- OK - STOP
Test Step 2. Perform the following diagnostic procedure: Digital Throttle Position Sensor Circuit - Test
Results:
- OK - STOP