Dodge ZB 2005 Service Manual page 1292

Symptom:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH
When Monitored and Set Condition:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH
When Monitored: With the ignition key on and the engine speed greater than 0 RPM.
Set Condition: When the PCM regulates the generator field and there are no detected
field problems, but the voltage output does not decrease.
CHARGING SYSTEM OPERATION
(K20) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
GENERATOR FIELD COIL SHORTED TO GROUND
BATTERY TEMPERATURE SENSOR
PCM
TEST
1 NOTE: Battery must be fully charged and be capable of passing a load test.
Note: Generator Belt tension and condition must be checked before con-
tinuing.
Ignition on, engine not running.
With the DRBIII , read DTCs and the related Freeze Frame data then clear the
DTCs.
With DRBIII , actuate the Generator Field Driver.
With a 12-volt test light connected to ground, backprobe the (K20) Gen Field Control
circuit in the back of Generator Field harness connector.
Does the test light illuminate brightly and flash?
Yes → Go To 2
No
2 Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field Harness connector.
Carefully inspect the related connectors for corrosion or spread terminals before
continuing.
Measure the resistance between ground and the (K20) Generator Field Driver circuit
at the Generator Field harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the (K20) Generator Field Control
No
POSSIBLE CAUSES
ACTION
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 3.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
→ Go To 3
DRIVEABILITY - GAS
171
APPLICABILITY
All
All