DTC 27, App No. 2 Circuit Range Fault: Notes

Accelerator Pedal Position (APP) module provides a voltage signal that changes relative to accelerator position. There are 3 sensors located within APP module that are scaled differently. DTC 27 will set when PCM has recognized a skewed (mis-scaled) sensor. PCM compares all 3 sensors to each other and determines if there is a 6 percent difference between APP No. 1 and APP No. 2, and a 10 percent difference to APP No. 3.

PCM will default to input from APP No. 2 sensor being ignored. A current and history DTC will set but will not turn on SERVICE THROTTLE SOON light. Throttle will operate normally as long as there is only one sensor malfunctioning. If 2 different APP sensors have a malfunction, the SERVICE THROTTLE SOON light will light and the PCM will limit power. If 3 APP sensors malfunction, the SERVICE THROTTLE SOON light will light and the PCM will only allow the engine to operate at idle.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step determines if a good 5-volt reference is present.
This step checks for an open in ground circuit.