Circuit Description
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) uses the 5-volt reference 1 circuit as a sensor feed to the following sensors:
- A/C pressure sensor.
- Throttle Position (TP) sensor No. 1.
- Accelerator Pedal Position (APP) sensor No. 2.
- Fuel Tank Pressure (FTP) sensor.
If ECM detects the voltage on the 5-volt reference 1 circuit is outside a valid range, DTC P1635 sets.