Chrysler PT Cruiser 2001 Service Manual Supplement page 2478

CHARGING
Symptom:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
GENERATOR FIELD SHORTED TO GROUND
PCM (BATTERY TEMPERATURE)
POWERTRAIN CONTROL MODULE (BATTERY VOLTAGE)
POWERTRAIN CONTROL MODULE (GENERATOR RESISTANCE)
TEST
1 Ignition on, engine not running.
With DRBIII , actuate the Generator Field Driver.
With a 12-volt test light, backprobe the Generator Field Driver Circuit in back of
Generator.
Did the light blink?
Yes → Go To 2
→ Go To 5
No
2 Ignition on, engine not running.
With the DRBIII , actuate the Generator Field Driver.
With DRBIII , stop the Generator Field Driver actuation.
With DRBIII , read the Target Charging voltage.
Is the Target Charging voltage above 13 volts?
Yes → Go To 3
→ Go To 4
No
3 Start the engine.
Manually set the engine speed to 1600 RPM.
With DRBIII , read both the Battery voltage and the Target Charging voltage.
Compare the Target Voltage to the Battery Voltage reading.
Monitor voltage for 5 minutes, if necessary. Look for a 1.0 volt difference or more.
Was there more than a 1.0 volt difference?
Yes → Replace the Powertrain Control Module.
→ Test Complete.
No
4 Turn the ignition off.
Note: Battery must be fully charged.
Note: Generator Belt tension and condition must be checked before con-
tinuing.
Start engine and allow it to reach operating temperature.
With the DRBIII in Inputs/Outputs, read the Batt/Amb Temperature sensor.
Using a Thermometer, measure under hood temperature.
Is the temperature within 10 F degrees of Battery temperature?
Yes → Test Complete.
→ Replace Powertrain Control Module.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
18
APPLICABILITY
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All
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All