Check APS
- IG "OFF". Connect GDS.
- Connect probe to APS 1 and APS 2 to check signal waveform by using oscilloscope function. Start engine.
- Measure signal waveform of APS by pressing and depressing accelerator pedal.
Specification: Signal waveform will be displayed as follows.
Pedal Position Output Voltage (V) [Vref = 5.0V] APS 1 APS 2 C.T 0.7 ~ 0.8V 0.29 ~ 0.46V W.O.T 3.85 ~ 4.35V 1.93 ~ 2.18V - Is the measured signal waveform normal?
YES
- Substitute with a known - good ECM (PCM) and check for proper operation. If the problem is corrected, replace ECM (PCM) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known-good APS and check for proper operation. If the problem is corrected, replace APS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.