Power and Ground Signals

Accelerator Pedal Position Reference Voltage (APPVREF) 

The APPVREF is a consistent positive voltage (5 volts plus or minus 0.5 volt) circuit.

Accelerator Pedal Position Return (APPRTN) 

The APPRTN is a return path for APPVREF circuit.

Electronic Throttle Control Reference Voltage (ETCREF) 

The ETCREF is a consistent positive voltage (5 volts plus or minus 0.5 volt) circuit.

Electronic Throttle Control Return (ETCRTN) 

The ETCRTN is a return path for ETCREF circuit.

Gold Plated Pins 

Some engine control hardware has gold plated pins within the connectors and mating harness connectors to improve electrical stability for low current draw circuits and to enhance corrosion resistance. The engine control (EC) components equipped with gold plated pins vary by vehicle application. Only replace gold plated pins with new gold plated pins.

Keep Alive Power (KAPWR) 

The KAPWR provides a constant voltage input independent of ignition switch state to the PCM. This voltage is used by the PCM to maintain the KAM.

Power Ground (PWRGND) 

The PWRGND circuits provides a return path for the PCM vehicle power (VPWR) circuits.

Signal Return (SIGRTN) 

The SIGRTN is a dedicated return path for VREF applied components.

Starter Motor Request (SMR) Circuit 

The SMR circuit provides the PCM with a signal from the ignition switch to the PCM. The input is pulled high when the ignition is in the START position and the transmission range (TR) sensor ignition lockout circuit allows the starter to engage.

Variable Reluctance Sensor Return (VRSRTN) 

The VRSRTN circuit is a dedicated return path for variable reluctance (VR) type sensors.

Vehicle Buffered Power (VBPWR) 

The VBPWR is a regulated voltage supplied by the PCM to vehicle sensors. These sensors require a constant 12 volts for operation and cannot withstand VPWR voltage variations. VBPWR is regulated to VPWR minus 1.5 volts and is also current limited to protect the sensors.

Vehicle Power (VPWR) 

The VPWR is the primary source of PCM power. VPWR is switched through the PCM power relay.

Vehicle Reference Voltage (VREF) 

The VREF is a consistent positive voltage (5 volts plus or minus 0.5 volt) provided by the PCM. VREF is typically used by 3 wire sensors and some digital input signals.