Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- The FTP sensor parameter on the scan tool should read between 1.4-1.5 volts with the ignition ON, engine OFF, and the fuel cap removed. This represents atmospheric pressure of 0 inches H2O of vacuum.
- The FTP sensor 5-volt reference circuit is shared with the following sensors:
- The exhaust gas recirculation (EGR) sensor
- The A/C refrigerant pressure sensor
- The A/T input shaft speed (ISS) sensor
- The accelerator pedal position (APP) sensor 2
- Inaccurate readings will occur if resistance measurements are taken on a FTP sensor. The FTP sensor contains an internal amplifier circuit that requires applied voltage to function properly.
- To locate an intermittent problem, monitor the FTP sensor voltage with the ignition ON, engine OFF. Wiggling wires, while watching for change in the FTP sensor voltage, may help locate the area where fault may exist.
- For intermittent conditions, refer to Intermittent Conditions .