Dodge Dakota (R1). Manual — part 132
Symptom:
P0400-EGR SHORT CIRCUIT
When Monitored and Set Condition:
P0400-EGR SHORT CIRCUIT
When Monitored:
With the ignition on.
Set Condition:
The ECM detects excessive current draw on the electric vacuum modula-
tor control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
EGR SOLENOID
EGR SOLENOID CONTROL SHORTED TO VOLTAGE
ENGINE CONTROL MODULE - INTERNAL
ENGINE CONTROL MODULE - INTERNAL SHORT TO VOLTAGE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Does the DRB display P0400 EGR OPEN CIRCUIT?
All
Yes
→
Replace the EGR Solenoid.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Measure the voltage of the EGR Solenoid Control circuit.
Is the voltage below 0.5 volt?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
63
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage of the EGR Solenoid Control circuit.
Is the voltage below 0.5 volt?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the EGR Solenoid Control circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
5
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 ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
64
DRIVEABILITY - DIESEL
P0400-EGR SHORT CIRCUIT —
Continued
Symptom:
P0460-FUEL LEVEL UNIT NO CHANGE OVER MILES
When Monitored and Set Condition:
P0460-FUEL LEVEL UNIT NO CHANGE OVER MILES
When Monitored:
With the ignition on.
Set Condition:
The PCM receives a vehicle speed signal for an extended duration without
a change in fuel level signal voltage.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
FUEL TANK OBSTRUCTING THE FUEL LEVEL SENSOR
POWERTRAIN CONTROL MODULE
FUEL LEVEL SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, check for additional PCM DTCs.
Are other Fuel Level Sensor DTCs present?
All
Yes
→
Refer to the Symptom List for diagnosis of other Fuel Level
Sensor related DTCs before continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
2
Turn the ignition off.
Disconnect the Fuel Level Sensor harness connector.
Turn the ignition on.
With the DRB, read and record the Fuel Level Sensor voltage.
NOTE: The DRB should read 10.0 volts with the Fuel Level Sensor harness
connector disconnected.
Connect a 12-volt test light between Fuel Level Sensor harness connector cavities 3
and 4.
With the DRB, read the Fuel Level Sensor voltage.
Did the voltage change to less than 10.0 volts?
All
Yes
→
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
65
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the Fuel Level Sensor from the Fuel Tank in accordance with the Service
Information.
Inspect the inside of the Fuel Tank for any obstructions or deformities.
Is the Fuel Tank OK?
All
Yes
→
Replace the Fuel Level Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair or replace the Fuel Tank in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
66
DRIVEABILITY - DIESEL
P0460-FUEL LEVEL UNIT NO CHANGE OVER MILES —
Continued
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