DTC P0088:00 [PCM (SKYACTIV-G 2.5T)]

id0102s8146100

Note
•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION

High fuel pressure sensor circuit range/performance problem
DETECTION CONDITION
Determination conditions
•  The actual fuel pressure becomes higher than the target fuel pressure by 1.2 MPa {12 kgf/cm2, 174 psi} while the fuel pressure feedback amount is maintained high.
Preconditions
•  Engine speed: 500 rpm or more*1
•  The following DTCs are not detected:
?  High fuel pressure sensor: P0089:00, P0192:00, P0193:00
?  High pressure fuel pump: P0091:00, P0092:00
*1: Standard can be verified by displaying PIDs using M-MDS
Malfunction determination period
•  5 s period
Drive cycle
•  1
Self test type
•  CMDTC self test
Sensor used
•  High fuel pressure sensor
FAIL-SAFE FUNCTION
•  Limits intake air amount
•  Stops high pressure fuel pump control
VEHICLE STATUS WHEN DTCs ARE OUTPUT
•  Illuminates check engine light.
POSSIBLE CAUSE
•  High pressure fuel pump connector or terminals malfunction
•  High fuel pressure sensor connector or terminals malfunction
•  PCM connector or terminals malfunction
•  High fuel pressure sensor malfunction
•  Fuel injector malfunction
•  High pressure fuel pump malfunction
?  Relief valve (built-into high pressure fuel pump) malfunction
•  PCM malfunction

System Wiring Diagram

•  Not applicable

Function Explanation (DTC Detection Outline)

•  The PCM calculates the target fuel pressure appropriate to the engine conditions relative to the actual fuel pressure based on the high fuel pressure sensor signal and provides feedback to the high pressure fuel pump control. If the difference between the actual fuel pressure and the target fuel pressure relative to the feedback amount is large, the PCM determines a malfunction in the high fuel pressure sensor and stores a DTC.

Repeatability Verification Procedure

1.  Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.
2.  Start the engine and leave it idling for 1 min.
Note
•  The target calculated by the PCM is increased and the DTC P0088:00 determination conditions are met by repeating the Step 3 operation.
3.  Shift to 1st gear and accelerate/decelerate the vehicle to 30—50 km/h {19—31 mph}.
Note
•  Match the engine coolant temperature in the recorded FREEZE FRAME DATA/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.
4.  Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the FREEZE FRAME DATA/snapshot data.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item

Definition

Unit

Condition/Specification
FUEL_PRES
Fuel pressure input from high fuel pressure sensor
KPa {MPa}, mBar {Bar}, psi, in H20
•  Displays fuel pressure
High fuel pressure sensor voltage
V
Ignition switched ON (engine off)
•  Fuel pressure is approx. 16.91 MPa {172.4 kgf/cm2, 2453 psi}: Approx. 2.91 V
Idle (after warm up)
•  Fuel pressure is 3.44—3.95 MPa {35.1—40.2 kgf/cm2, 499—572 psi}: 0.98—1.05 V (ECT is 90 °C {194 °F})


Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is the DTC P0088:00 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
3
PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
Note
•  Recording can be facilitated using the screen capture function of the PC.
•  Record the FREEZE FRAME DATA/snapshot data on the repair order.
—
Go to the next step.
4
PURPOSE: VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition off, then ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Are any other PENDING CODEs and/or DTCs present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
Go to the next step.
No
Go to the next step.
5
PURPOSE: VERIFY CONNECTOR CONNECTIONS
•  Start the engine.
•  Access the FUEL_PRES PID using the M-MDS.
•  Does the PID value fluctuate when the following connectors are shaken?
?  High fuel pressure sensor
?  PCM
Yes
Repair or replace the applicable wiring harness or connector parts.
Go to the troubleshooting procedure to perform the procedure from Step 2.
No
Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure
•  Step 1
?  Perform a unit inspection of the high fuel pressure sensor.
•  Step 2—3
?  Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION
1
PURPOSE: DETERMINE INTEGRITY OF HIGH FUEL PRESSURE SENSOR
•  Inspect the high fuel pressure sensor.
•  Is there any malfunction?
Yes
Replace the fuel distributor, then go to the next step.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T].)
No
Go to the next step.
2
PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Implement the repeatability verification procedure.
•  Perform the DTC Reading Procedure.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
3
PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION
•  Is any other DTC or pending code stored?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
No
DTC troubleshooting completed.