Diagnostic Aids
The 5V reference 1 circuit provides 5V circuits to the sensors listed below:
- Air conditioning (A/C) refrigerant pressure sensor
- Exhaust and intake camshaft position sensors
- Engine oil pressure sensor
- Fuel pressure sensor
- Fuel rail pressure sensor
- Fuel tank pressure sensor
- Turbocharger boost/intake air temperature sensor
The 5V reference 2 circuit provides 5V circuits to the sensors listed below:
- Brake pedal position sensor (automatic transmission)
- Clutch pedal position sensor (manual transmission)
- Crankshaft position sensor
- Multifunction intake air sensor
- Vehicle speed sensor
The 5V reference 3 circuit provides 5V circuits to the sensors listed below:
- Accelerator pedal position sensor 2
- Manifold absolute pressure sensor
The 5V reference 4 circuit provides 5V circuits to the sensors listed below:
- Accelerator pedal position Sensor 1
- Throttle position Sensor 1 and 2
Disconnecting one component at a time from the affected 5V reference circuit while observing the scan tool 5V Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.