Symptom:
P2503-CHARGING SYSTEM VOLTAGE LOW
When Monitored and Set Condition:
P2503-CHARGING SYSTEM VOLTAGE LOW
When Monitored: The engine running. The engine speed greater than 1157 RPM.
Set Condition: The battery sensed voltage is 1 volt below the charging goal for 13.47
seconds. The PCM senses the battery voltage, turns off the field driver and senses the
battery voltage again. If the voltages are the same, the code is set.
POSSIBLE CAUSES
CHARGING VOLTAGE BELOW 15.1 VOLTS
(A11) B+ CIRCUIT HIGH RESISTANCE
GENERATOR GROUND HIGH RESISTANCE
GENERATOR OPERATION
(Z1) GEN FIELD GROUND CIRCUIT OPEN
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND
(K20) GEN FIELD CONTROL CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
1 NOTE: Inspect the vehicle for aftermarket accessories that may exceed the
Generator System output.
Turn the ignition off.
NOTE: The battery must be fully charged.
NOTE: The Generator belt tension and condition must be checked before
continuing.
Start the engine.
Allow the idle to stabilize.
With the DRBIIIt, read the Target Charging Voltage.
Is the Target Charging Voltage above 15.1 volts?
All
Yes → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-3-NGC.
No → Go To 2
282
DRIVEABILITY - NGC
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