Diagnostic Aids: P0651

The 5-volt reference 2 circuit provides 5 volts to the following sensors:

• The accelerator pedal position (APP) sensor 2
• The air conditioning (A/C) refrigerant pressure sensor
• The exhaust gas recirculation (EGR) valve
• The fuel tank pressure (FTP) sensor
• The intake manifold tuning (IMT) valve position sensor
• The manifold absolute pressure (MAP) sensor
• The rough road sensor