Five volt sensor supplies-primary and secondary. Ignition circuit sense-pcm input

Five volt sensor supplies-primary and secondary

DESCRIPTION

Two different Powertrain Control Module (PCM) five volt supply circuits are used; primary and secondary.

OPERATION

These 2 circuits will:

• supply the required 5 volt power source to the Crankshaft Position (CKP) sensor.
• supply the required 5 volt power source to the Camshaft Position (CMP) sensor.
• supply a reference voltage for the Manifold Absolute Pressure (MAP) sensor.
• supply a reference voltage for the Throttle Position Sensor (TPS) sensor.
• supply the required 5 volt power source to the oil pressure sensor.
• supply the required 5 volt power source for the Vehicle Speed Sensor (VSS) (if equipped).
• supply the 5 volt power source to the transmission pressure sensor (if equipped with an RE automatic transmission).

Fuel level sensor-pcm input

DESCRIPTION

The fuel level sensor (fuel gauge sending unit) is located on the fuel pump module.

OPERATION

Refer to Fuel Gauge Sending Unit in the Fuel Delivery section for information.

Ignition circuit sense-pcm input

DESCRIPTION

This circuit ties the ignition switch to the Powertrain Control Module (PCM).

OPERATION

The ignition circuit sense input tells the PCM the ignition switch has energized the ignition circuit.

Battery voltage is supplied to the PCM through the ignition switch when the ignition is in the RUN or START position. This is referred to as the "ignition sense" circuit and is used to "wake up" the PCM.

Voltage on the ignition input can be as low as 6 volts and the PCM will still function. Voltage is supplied to this circuit to power the PCM's 5 volt primary and 5 volt secondary circuits. This allows the PCM to perform fuel, ignition and emissions control functions.