2001 CHRYSLER VOYAGER reset

P0620-GENERATOR FIELD CONTROL MALF SHORT CIRCUIT
When Monitored: With the ignition on.
Set Condition: The ECM detects a short to voltage on the Generator Field Control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
GENERATOR FIELD
GENERATOR FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE
GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
GENERATOR FIELD CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition cycles, turning the ignition off for at least 10 seconds
between each ignition cycle.
Monitor the DRB for ECM DTCs.
Did this DTC reset?All
Ye s®Go To 2
No®Go To 7
2 Turn the ignition off.
Disconnect the Generator Field harness connector.
Measure the resistance of the Field Control terminals on the back of the Generator.
Is the resistance between 2 and 6 ohms?All
Ye s®Go To 3
No®Repair or replace the Generator as necessary.
Perform CHARGING VERIFICATION - VER-3.
3 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Generator Field harness connector.
Remove the ECM/PCM Relay from the PDC.
Connect a jumper wire between cavity 1 and cavity 4 of the ECM/PCM Relay
connector.
Turn the ignition on.
Measure the voltage of the Generator Field Control circuit.
Is the voltage below 0.5 volt?All
Ye s®Go To 4
No®Repair the Generator Field Control circuit for a short to voltage.
Perform CHARGING VERIFICATION - VER-3.
127
DRIVEABILITY - DIESEL
P0620-GENERATOR FIELD CONTROL MALF BATTERY VOLTAGE DEVI-
ATION TOO HIGH Ð
Continued

Symptom List:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO
HIGH
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO
HIGH
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0641-SENSOR REFERENCE
VOLTAGE A CKT VOLTAGE TOO HIGH.
When Monitored and Set Condition:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: The ECM detects a short to voltage on the Sensor Reference Voltage A
circuit.
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: The ECM detects a short to voltage on the Sensor Reference Voltage B
circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
SENSOR REFERENCE VOLTAGE A OR 5-VOLT CIRCUIT SHORTED TO VOLTAGE
SENSOR REFERENCE VOLTAGE B OR 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
FUEL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
ACCELERATOR PEDAL POSITION SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Did this DTC reset?All
Ye s®Go To 2
No®Go To 7
133
DRIVEABILITY - DIESEL

Symptom List:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO LOW
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0641-SENSOR REFERENCE
VOLTAGE A CKT VOLTAGE TOO LOW.
When Monitored and Set Condition:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO LOW
When Monitored: With the ignition on.
Set Condition: The ECM detects an open or short to ground on the Sensor Reference
Voltage A circuit.
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO LOW
When Monitored: With the ignition on.
Set Condition: The ECM detects an open or short to ground on the Sensor Reference
Voltage B circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
MAF, OIL PRESS, BOOST PRESS, A/C PRESS, APP OR FUEL PRESS SENSOR SHORT TO
GROUND
SENSOR REFERENCE VOLTAGE OR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
SENSOR REFERENCE VOLTAGE OR 5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR
GROUND
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Did this DTC reset?All
Ye s®Go To 2
No®Go To 8
136
DRIVEABILITY - DIESEL

Symptom:
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO
EARLY
When Monitored and Set Condition:
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO EARLY
When Monitored: During after-run.
Set Condition: The internal ECM timer determines that the ECM/PCM Relay has shut
off before the AFTER-RUN mode of operation has been completed.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
INTERMITTENT CONDITION
SUBSTITUTE ECM/PCM RELAY
ECM/PCM RELAY CONTROL CIRCUIT OPEN INTERMITTENTLY
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, check for additional DTCs.
Are other DTCs present?All
Ye s®Refer to the Symptom List for diagnosis of the other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No®Go To 2
2 Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?All
Ye s®Go To 3
No®Go To 5
145
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Install a substitute relay in place of the ECM/PCM Relay.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?All
Ye s®Go To 4
No®Replace the ECM/PCM Relay.
Perform ROAD TEST VERIFICATION - VER-2.
4 Turn the ignition off.
Remove the ECM/PCM Relay from the IPM.
Disconnect the ECM harness connectors.
Measure the resistance of the ECM/PCM Relay Control circuit while wiggling the
wiring harness and connectors between the ECM and the IPM.
Was the resistance above 5.0 ohms at any time while wiggling the wiring harness and
connectors?All
Ye s®Repair the ECM/PCM Relay Control circuit for an intermittent
open.
Perform ROAD TEST VERIFICATION - VER-2.
No®Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
5WARNING: 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
Ye s®Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No®Test Complete.
146
DRIVEABILITY - DIESEL
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO EARLY Ð
Continued

Symptom:
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO
LATE
When Monitored and Set Condition:
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO LATE
When Monitored: During after-run.
Set Condition: The internal ECM timer determines that the ECM/PCM Relay remains on
too long when AFTER-RUN mode of operation has been completed.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
INTERMITTENT CONDITION
SUBSTITUTE ECM/PCM RELAY
ECM/PCM RELAY CONTROL CIRCUIT SHORTED TO GROUND INTERMITTENTLY
ECM/PCM RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, check for additional DTCs.
Are other DTCs present?All
Ye s®Refer to the Symptom List for diagnosis of the other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No®Go To 2
2 Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?All
Ye s®Go To 3
No®Go To 6
147
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Install a substitute relay in place of the ECM/PCM Relay.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?All
Ye s®Go To 4
No®Replace the ECM/PCM Relay.
Perform ROAD TEST VERIFICATION - VER-2.
4 Turn the ignition off.
Remove the ECM/PCM Relay from the IPM.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the ECM/PCM Relay Control circuit
while wiggling the wiring harness and connectors.
Was the resistance below 5.0 ohms at any time while wiggling the wiring harness and
connectors?All
Ye s®Repair the ECM/PCM Relay Control circuit for an intermittent
short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No®Go To 5
5 Turn the ignition off.
Remove the ECM/PCM Relay from the IPM.
Turn the ignition on.
Measure the voltage of the ECM/PCM Relay Output circuit.
Is the voltage below 0.5 volt?All
Ye s®Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No®Repair the ECM/PCM Relay Output circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
6WARNING: 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
Ye s®Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No®Test Complete.
148
DRIVEABILITY - DIESEL
P0685-ECM/PCM RELAY CONTROL CIRCUIT SHUTS OFF TOO LATE Ð
Continued

TEST ACTION APPLICABILITY
1WARNING: THE FUEL INJECTION PUMP SUPPLIES HIGH PRESSURE
FUEL TO EACH INDIVIDUAL INJECTOR THROUGH HIGH-PRESSURE
FUEL LINES. FUEL UNDER HIGH PRESSURE CAN PENETRATE SKIN
AND CAUSE PERSONAL INJURY. WEAR SAFETY GOGGLES AND ADE-
QUATE PROTECTIVE CLOTHING.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine several times, turning the ignition off for at least 30 seconds
between each run cycle.
Monitor the DRB for ECM DTCs.
Did this DTC reset?All
Ye s®Go To 2
No®Go To 8
2 Turn the ignition off.
Disconnect the Fuel Pressure Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ECM/PCM Relay Output
circuit.
Does the test light illuminate brightly?All
Ye s®Go To 3
No®Repair the ECM/PCM Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3 Turn the ignition off.
Disconnect the Fuel Pressure Solenoid harness connector.
Disconnect the ECM harness connectors.
Remove the ECM/PCM Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ECM/PCM Relay
connector.
Turn the ignition on.
Measure the voltage of the Fuel Pressure Solenoid Control circuit.
Is the voltage below 1.0 volt?All
Ye s®Go To 4
No®Repair the Fuel Pressure Solenoid Control circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
4 Turn the ignition off.
Disconnect the Fuel Pressure Solenoid harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Fuel Pressure Solenoid Control
circuit.
NOTE: The Fuel Pressure Solenoid Control circuit is duplicated at ECM
cavities C2-80 and C2-81.
Is the resistance above 100k ohms?All
Ye s®Go To 5
No®Repair the Fuel Pressure Solenoid Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
159
DRIVEABILITY - DIESEL
P1131-FUEL PRESSURE SOLENOID OPEN CIRCUIT ÐContinued