Diagnostic Aids
The 5 V reference 1 circuit provides 5 V circuits to the sensors listed below:
- Air conditioning (A/C) refrigerant pressure sensor
- Exhaust and intake camshaft position sensors
- Manifold absolute pressure sensor
- Vehicle stability control switch
The 5 V reference 2 circuit provides 5 V circuits to the sensors listed below:
- Brake booster vacuum sensor
- Brake pedal position sensor (automatic transmission)
- Clutch pedal position sensor (manual transmission)
- Crankshaft position sensor
- Engine oil pressure sensor
- Turbocharger boost/intake air temperature sensor
The 5 V reference 3 circuit provides 5 V circuits to the sensor listed below:
Accelerator pedal position sensor 2
The 5 V reference 4 circuit provides 5 V circuits to the sensors listed below:
- Accelerator pedal position sensor 1
- Throttle position sensor 1 and 2
The 5 V reference 5 circuit provides 5 V circuits to the sensor listed below:
- Fuel rail pressure sensor
- Fuel tank pressure sensor
Disconnecting one component at a time from the affected 5 V reference circuit while observing the scan tool 5 V 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 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.