Dodge Ram Truck 1500-2500-3500. Manual — part 1038
P0088-FUEL RAIL PRESSURE SIGNAL IS ABOVE MAX LIMIT
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0088-FUEL RAIL PRESSURE SIGNAL IS ABOVE MAX LIMIT (CONTINUED)
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Engine running.
•
Set Condition:
Fuel pressure is above a calibrated value for a calibrated amount of time.
Possible Causes
FUEL CONTROL ACTUATOR (FCA)
FUEL PRESSURE SENSOR
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
Fuel Pressure Sensor
Using the scan tool, compare the scan tool reading for fuel pressure set point to the scan tool reading for actual fuel
pressure.
Does the actual fuel pressure correlate with the fuel pressure setpoint while operating the engine over
various operating conditions?
Yes
>> Go To 2
No
>> Check the electrical connector of the Fuel Control Actuator, if the connection is tight, replace the fuel
control actuator.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING).
2.
FUEL PUMP
Turn the ignition on.
Disconnect the Electronic Fuel Control Actuator connector.
Connect an incandescent test light across the Fuel Control Actuator driver pin and the Fuel Control Actuator return
wire at the fuel control actuator connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily flash the test light brightly, one time,
approximately 20 seconds after being connected.
NOTE: Compare test light brightness to that of a direct connection to the battery.
Did the light flash brightly?
Yes
>> Replace the fuel pump.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
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P0106-INLET AIR PRESSURE SENSOR RATIONALITY
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0106-INLET AIR PRESSURE SENSOR RATIONALITY (CONTINUED)
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the ignition is on.
•
Set Condition:
The Inlet air pressure is above a calibrated threshold.
Possible Causes
INLET AIR PRESSURE SENSOR
INTERMITTENT CONDITION
TROUBLESHOOT OTHER DTC’S FIRST
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
Troubleshoot other DTC’s First
Using the Scan tool, check for additional DTC’s.
Do you have any other air pressure related DTC’s?
Yes
>> Troubleshoot other DTC’s First.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Go To 2
2.
INLET AIR PRESSURE SENSOR
Using the scan tool, monitor the Inlet air pressure sensor values.
Do the readings on the scan tool fluctuate slightly?
No
>> Replace the Inlet Air Temperature/ Pressure sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1077
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