Diagnostic Aids
The 5V reference 1 circuit provides 5 V to the sensors listed below:
- Intake manifold pressure and air temperature sensor
- Exhaust and intake camshaft position sensors
- Air conditioning (A/C) refrigerant pressure sensor
The 5V reference 2 circuit provides 5 V to the sensors listed below:
- Brake booster vacuum sensor
- Manifold absolute pressure sensor
- Crankshaft position sensor
- Brake pedal position sensor
- Engine oil pressure sensor
The 5V reference 3 circuit provides 5 V to the accelerator pedal position sensor 2.
The 5V reference 4 circuit provides 5 V to the sensors listed below:
- Accelerator pedal position sensor 1
- Throttle position sensor
The 5V reference 5 circuit provides 5 V to the sensors listed below:
- Fuel rail pressure sensor
- Fuel tank pressure sensor
- Multifunction intake air sensor
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.