Dodge Dakota (R1). Manual — part 120
Symptom:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH - DIESEL
When Monitored and Set Condition:
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH - DIESEL
When Monitored:
With the engine running.
Set Condition:
The voltage at PCM cavity C1-22 is 1.0 volt or more above the target
charging voltage for at least 3 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND
POWERTRAIN CONTROL MODULE (TARGET CHARGING VOLTAGE TOO LOW)
GENERATOR SHORTED TO GROUND INTERNALLY
POWERTRAIN CONTROL MODULE (FIELD DRIVER SHORTED TO GROUND)
TEST
ACTION
APPLICABILITY
1
NOTE: The battery must be fully charged and the generator belt must be in
good condition and tensioned properly before continuing.
Turn the ignition on.
With the DRB, actuate the Generator Field.
Measure the voltage between ground and the Generator Field Driver circuit by back
probing the Generator Field harness connector with a voltmeter.
Does the voltage cycle from B+ to below 2.0 volts?
All
Yes
→
No
→
NOTE: With the DRB, stop the Generator Field actuation.
2
Start the engine.
With the DRB, read the Target Charging voltage
Is the Target Charging voltage above 13.0 volts?
All
Yes
→
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
15
CHARGING
TEST
ACTION
APPLICABILITY
3
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform CHARGING VERIFICATION - VER-3.
No
→
Test Complete.
4
Turn the ignition off.
Disconnect PCM harness connector C2.
Disconnect the Generator Field harness connector.
Measure the resistance between ground and the Generator Field Driver circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Generator Field Driver circuit for a short to ground.
Perform CHARGING VERIFICATION - VER-3.
5
Turn the ignition off.
Disconnect the Generator Field harness connector.
Measure the resistance between ground and the Generator Field Driver terminal on
the back of the Generator.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair or replace the Generator as necessary.
Perform CHARGING VERIFICATION - VER-3.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
16
CHARGING
P1594-CHARGING SYSTEM VOLTAGE TOO HIGH - DIESEL —
Continued
Symptom:
P1600-BATTERY VOLTAGE SRC HIGH EXCEEDED - DIESEL
When Monitored and Set Condition:
P1600-BATTERY VOLTAGE SRC HIGH EXCEEDED - DIESEL
When Monitored:
With the ignition on.
Set Condition:
The ECM detects the system voltage has exceeded 20 volts for at least 5
seconds.
POSSIBLE CAUSES
CHECK THE CHARGING VOLTAGE AT 2000 RPM
CLEAR THE DTC AND RETEST
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
Start the engine.
Set the engine speed to 2000 RPM.
Measure the voltage at the battery.
Is the voltage above 17.0 volts?
All
Yes
→
Refer to symptom list for problems related to the charging
system.
Perform CHARGING VERIFICATION - VER-3.
No
→
2
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine and vary the engine speed between idle and 2500 RPM for several
minutes..
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
No
→
17
CHARGING
TEST
ACTION
APPLICABILITY
3
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform CHARGING VERIFICATION - VER-3.
No
→
Test Complete.
18
CHARGING
P1600-BATTERY VOLTAGE SRC HIGH EXCEEDED - DIESEL —
Continued
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