Chrysler PT Cruiser 2001 Service Manual Supplement page 2479

P1594-CHARGING SYSTEM VOLTAGE TOO HIGH —
TEST
5 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 6
→ Go To 9
No
6 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.
→ Go To 7
No
7 Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Connector to ground.
Is the resistance below 5.0 ohms?
Yes → Repair the Generator Field Driver Circuit shorted to ground.
→ Go To 8
No
8 Turn the ignition off.
Disconnect the Field Harness Connector at back of the Generator.
Note: Check connectors - Clean/repair as necessary.
Measure resistance of the Generator Field Driver Circuit at the Generator to Ground.
Is the resistance below 5.0 ohms?
Yes → Repair or replace the shorted Generator as necessary.
→ Go To 12
No
9 Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Connector to ground.
Is the resistance below 5.0 ohms?
Yes → Repair the Generator Field Driver Circuit shorted to ground.
→ Go To 10
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
19
CHARGING
Continued
APPLICABILITY
All
All
All
All
All