Cherokee 4WD L6-4.0L VIN S (1998)
Volt Meter Gauge: Description and Operation
SYSTEM OPERATION
The voltmeter gives an indication of the electrical system voltage. The instrument cluster circuitry controls the gauge pointer position. The
instrument cluster circuitry calculates the proper gauge pointer position based upon a system voltage message received from the Powertrain
Control Module (PCM) on the Chrysler Collision Detection (CCD) data bus.
The PCM uses an input from the electrical system and internal programming to decide what system voltage message is required. The PCM then
sends the proper message to the instrument cluster on the CCD data bus.
If the PCM message indicates that the charging system has failed, the instrument cluster circuitry moves the gauge needle to the 9 Volt graduation
on the gauge face, and turns on the Check Gauges lamp. If the PCM message indicates that system voltage is high, the instrument cluster circuitry
moves the gauge needle to the 19 Volt graduation on the gauge face, and turns on the Check Gauges lamp.
Refer to Powertrain Management/Computer and Control Systems for more information on the PCM. Refer to Starting and Charging/Charging
Systems for more information on charging system components and diagnosis.
