P0088 FUEL RAIL PRESSURE SIGNAL IS ABOVE MAX LIMIT
When Monitored and Set Condition:
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
DIAGNOSTIC PROCEDURE
NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
NOTE: This DTC will only clear by turning the ignition off. It is necessary to operate the engine for at least five seconds to verify the DTC will clear.
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Check for a mechanically stuck Fuel Control Actuator by turning the key switch on and off and listening for a click at the FCA. Do you hear a click from the actuator when the key is cycled off?
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). -
Using the DRBIII®, monitor the fuel pressure while operating the engine at several different RPM settings. Did the fuel pressure reading on the DRBIII® change?
Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
No --> Replace the Fuel Pressure Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).