The Electronic Control Module (ECM) detects the following conditions:
- The signal frequency from the accelerator pedal position sensor is less than 150 Hz or the signal frequency is greater than 1050 Hz for more than two seconds.
- The ECM has been powered for at least three seconds.
- Diagnostic code 0091-03 is not active.
- Diagnostic code 0091-04 is not active.
- Diagnostic codes for the 8 Volt sensor supplies are not active.
System Response:
Limp home mode is activated.
The ECM sets the "Throttle Position" to "0%".
If equipped, the warning light will be on. The diagnostic code will be logged if the engine is running. The diagnostic code will not be logged if the engine is cranking.
If a second throttle is installed, the engine will use the second throttle until the fault is repaired.
If a second throttle is not installed or if the second 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.
This diagnostic code indicates that the frequency of a digital throttle signal is out of the normal range.
Test Step 1. Perform the following diagnostic procedure: Digital Throttle Position Sensor Circuit - Test
Results:
- OK - STOP