Grand Cherokee 2WD L6-4.0L VIN S (1997)
Fuel Pump Relay
FUEL PUMP RELAY-PCM OUTPUT
The Powertrain Control Module (PCM) energizes the electric fuel pump through the fuel pump relay. Battery voltage is applied to the fuel pump
relay when the ignition key is ON. The relay is energized when a ground signal is provided by the PCM.
The fuel pump will operate for approximately one second unless the engine is operating or the starter motor is engaged.
Fig. 13 PDC Location
The fuel pump relay is located in the Power Distribution Center (PDC).
Generator Field Driver
GENERATOR FIELD DRIVER (-)-PCM OUTPUT
This output from the Powertrain Control Module (PCM) regulates charging system ground control to the generator field driver (-) circuit.
Generator Field Source
GENERATOR FIELD SOURCE (+)-PCM OUTPUT
This output from the Powertrain Control Module (PCM) regulates charging system voltage to the generator field source (+) circuit. The voltage
range is 12.9 to 15.0 volts. Jeep models of previous years had used the ASD relay to apply the 12 volt + power supply to the generator field
source (+) circuit.
Generator Lamp
GENERATOR LAMP-PCM OUTPUT
If the powertrain control module (PCM) senses a low charging condition in the charging system, it will illuminate the generator lamp (if equipped)
on the instrument panel. This is done through the CCD Bus circuits. For example, during low idle with all accessories turned on, the lamp may
momentarily go on. Once the PCM corrects idle speed to a higher rpm, the lamp will go out.
Governor Pressure Solenoid
GOVERNOR PRESSURE SOLENOID-PCM OUTPUT
This solenoid regulates the transmission fluid line pressure to produce the governor pressure necessary for transmission shift control. It is used on
4-speed electronic transmissions only.
Idle Air Control (IAC) Motor
IDLE AIR CONTROL (IAC) MOTOR-PCM OUTPUT
