Charge Indicator Malfunction
Diagnostic Instructions
Circuit/System Description
The engine control module (ECM) uses the generator turn ON
signal circuit to control the load of the generator on the engine.
A high side driver in the ECM applies voltage to the voltage
regulator. This signals the voltage regulator to turn the field
circuit ON and OFF. The ECM monitors the state of the generator
turn ON signal circuit. The ECM should detect low voltage on the
generator turn on signal circuit when the ignition is ON and the
engine is OFF, or when the charging system malfunctions. With the
engine running, the ECM should detect high voltage on the generator
turn on signal circuit. The ECM performs key ON and RUN tests to
determine the status of the generator turn on signal circuit. If a
malfunction is detected the ECM will illuminate the charge
indicator in the instrument cluster.
Reference Information
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Indicator/Warning Message Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Ignition ON, engine running,
verify the scan tool Battery Voltage parameter is between 12.5-15.5
V. |
| 2. |
Command the All Indicators
test ON and OFF with the scan tool. Verify that the charge
indicator turns ON and OFF. |
| ⇒ |
If the charge indicator always stays on or always
off, replace the P16 Instrument Cluster. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for Instrument Cluster replacement,
setup, and programming
|
