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 camshaft position sensor
- Fuel Pressure Sensor
- Intake camshaft position sensor
- Manifold Absolute Pressure Sensor
The 5 V reference 2 circuit provides 5 V circuits to the sensors listed below:
- Brake pedal position sensor
- Crankshaft position sensor
- Engine oil pressure sensor
- Evaporative Emission System Leak Detection Pump Assembly
- Multifunction Intake Air sensor
The 5 V reference 3 circuit provides 5 V circuits to the sensors 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 body
The 5 V reference 5 circuit provides 5 V circuits to the sensors 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.