Jeep Cherokee

 Service Manual

Fuel system » Fuel injection system » Description and operation
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).

Powertrain control module (PCM)

Modes of operation

Automatic shutdown (asd) relay sense-pcm input

Battery voltage-pcm input

Brake switch-pcm input

Five volt sensor supplies-primary and secondary

Fuel level sensor-pcm input

Engine coolant temperature sensor-pcm input

Extended idle switch-pcm input

Oxygen sensor-pcm input

Ignition circuit sense-pcm input

Intake manifold air temperature sensor-pcm input

Manifold absolute pressure (map) sensor-pcm input

Oil pressure sensor-pcm input

Power grounds

Power steering pressure switch- pcm input

Sensor return-pcm input

Throttle position sensor (tps)-pcm input

Vehicle speed and distance sensor- pcm input

Auto shutdown (asd) relay-pcm output

CCD bus (+/-) circuits-pcm outputs

Data link connector-pcm input and output

Fuel injectors-pcm output

Fuel pump relay-pcm output

Idle air control (iac) motor-pcm output

Radiator fan relay-pcm output

Throttle body