DESCRIPTION

Fuel pressure sensor circuit range/performance problem

DETECTION CONDITION

Determination conditions

• The actual fuel pressure is lower than the target fuel pressure by 1.2 MPa {12 kgf/cm², 174 psi} or more even though the fuel pressure feedback amount is maintained high.

Preconditions

• Engine speed: 500 rpm or more^*1

• The following DTCs are not detected:

• Fuel pressure sensor: P0089:00, P0192:00, P0193:00

• High pressure fuel pump: P0091:00, P0092:00

• ^*1: Value 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

• 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

• Air suction in fuel line due to fuel is runout

• High pressure fuel pump connector or terminals malfunction

• Fuel pressure sensor connector or terminals malfunction

• PCM connector or terminals malfunction

• Fuel pressure sensor malfunction

• Fuel delivery system malfunction (insufficient fuel pressure)

• Fuel injector malfunction

• High pressure fuel pump malfunction

• Relief valve (built-into high pressure fuel pump) malfunction

• PCM malfunction

Item

Definition

Unit

Condition/Specification

FUEL_PRES

Fuel pressure input from fuel pressure sensor

KPa , mBar , psi, in H20

• Displays fuel pressure

Fuel pressure sensor voltage

V

Ignition switched ON (engine off)

• Fuel pressure is approx. 3.6 MPa {37 kgf/cm², 522 psi}: Approx. 1.01 V (ECT is 92 °C {198 °F})

Idle (after warm up)

• Fuel pressure is approx. 3.45 MPa {35.2 kgf/cm², 500 psi}: Approx. 1 V (ECT is 92 °C {198 °F})

Racing (Engine speed is 2,000 rpm)

• Fuel pressure is approx. 3.21 MPa {32.7 kgf/cm², 466 psi}: Approx. 0.96 V (ECT is 86 °C {187 °F})

Racing (Engine speed is 4,000 rpm)

• Fuel pressure is approx. 5.59 MPa {57.0 kgf/cm², 811 psi}: Approx. 1.29 V (ECT is 84 °C {183 °F})

STEP

INSPECTION

RESULTS

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Is the DTC P0087:00 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 2.0)].)

3

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

• Verify the snapshot data FLI.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Is the snapshot data FLI 5% or less?

Yes

Refill the fuel.

Go to the troubleshooting procedure to perform the procedure from Step 3.

No

Go to the next step.

5

• Switch the ignition off, then ON (engine off).

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• 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 2.0)].)

Go to the next step.

No

Go to the next step.

6

• Start the engine.

• Access the FUEL_PRES PID using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Does the PID value fluctuate when the following connectors are shaken?

• 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 3.

No

Go to the next step.

7

NOTE:

• Verify the fuel pressure on the low pressure side with the operation of the high pressure fuel pump turned off.

• Bleed the remaining pressure in the fuel line using the following procedure.

• Switch the ignition off.

• Disconnect the high pressure fuel pump connector.

• Disconnect the fuel pump relay.

• Start the engine and wait until the engine stalls.

• Switch the ignition off.

• Install the fuel pump relay.

• Switch the ignition ON (engine off).

• Display PID FUEL_PRES and simulation item FP using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Turn simulation item FP on.

• Is the FUEL_PRES PID value 430 kPa {4.38 kgf/cm², 62.4 psi} or more?

Yes

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.

STEP

INSPECTION

RESULTS

ACTION

1

• Inspect the fuel pump unit.

  (See FUEL PUMP UNIT INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the fuel pump unit, then go to Step 3.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction.

• If there is any malfunction:

• Repair or replace the malfunctioning part according to the inspection results, then go to Step 3.

• If there is no malfunction:

• Go to the next step.

2

• Inspect the fuel pressure sensor.

  (See FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the fuel distributor, then go to the next step.

(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

3

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See CLEARING DTC [PCM (SKYACTIV-G 2.0)].)

• Implement the repeatability verification procedure.

  (See Repeatability Verification Procedure.)

• Perform the DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the next step.

No

Go to the next step.

4

• Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.