Diagnosis Procedure

BLEED THE FUEL LINE
1. Start the engine, and let the engine run at idle at least for 10 minutes.
2. Perform DTC confirmation procedure of DTC P0087.
  Is 1st trip DTC detected?
  
  YES: GO TO 2.
  
  NO: GO TO 6.

CHECK LOW FUEL PRESSURE

WITH CONSULT

Start the engine.

Check "L/FUEL PRES SEN V" in "DATA MONITOR" mode of "ECM" using CONSULT.

Monitor item	Condition	Value (Approx.)
L/FUEL PRES SEN V	Engine speed: idle	3, 000 - 3, 300 mV
L/FUEL PRES SEN V	Engine speed: 3, 000 rpm (no load)	3, 000 - 3, 300 mV

WITHOUT CONSULT

Start the engine.

Check low fuel pressure sensor signal voltage.

+		-	Condition	Value (Approx.)
Low fuel pressure sensor
Connector	Terminal
F39	2	Ground	Engine speed: idle	3.0 - 3.3 V
F39	2	Ground	Engine speed: 3, 000 rpm (no load)	3.0 - 3.3 V

Is inspection result normal?

YES: GO TO 3.

NO: Check low fuel pressure system. Refer to "DIAGNOSIS PROCEDURE ".

CHECK LOW PRESSURE FUEL LINE FOR INTERNAL LEAKAGE
WITH CONSULT
1. Turn ignition switch OFF.
2. Turn ignition switch ON.
3. Select "L/FUEL PRES SEN" in "DATA MONITOR" of "ECM" with CONSULT.
4. Check the following value 30 minutes after turning the ignition switch ON.
  L/FUEL PRES SEN: More than 0.20 MPa
WITHOUT CONSULT
1. Turn ignition switch OFF.
2. Connect fuel pressure gauge. Refer to "WORK PROCEDURE ".
3. Turn ignition switch ON.
4. Check the following value 30 minutes after turning the ignition switch ON.
  Low fuel pressure: 206 kPa (2.2 kgf/cm ² , 30 psi) or more
  
  Is inspection result normal?
  
  YES: GO TO 4.
  
  NO: Replace low pressure fuel pump. Refer to "REMOVAL AND INSTALLATION ".
CHECK HIGH PRESSURE FUEL PUMP
Check high pressure fuel pump. Refer to "COMPONENT INSPECTION (HIGH PRESSURE FUEL PUMP) ".

Is inspection result normal?

YES: GO TO 5.

NO: Repair or replace the error-detected parts.
CHECK LIFTER
Check lifter. Refer to "REMOVAL AND INSTALLATION ".

Does the lifter top surface have scratches and/or dents?

YES: Replace the error-detected parts.

NO: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".
CHECK LOW PRESSURE FUEL LINE FOR INTERNAL LEAKAGE
WITH CONSULT
1. Turn ignition switch OFF.
2. Turn ignition switch ON.
3. Select "L/FUEL PRES SEN" in "DATA MONITOR" mode of "ECM" using CONSULT.
4. Check the following value 30 minutes after turning the ignition switch ON.
  L/FUEL PRES SEN: More than 0.20 MPa
WITHOUT CONSULT
1. Turn ignition switch OFF.
2. Connect fuel pressure gauge. Refer to "WORK PROCEDURE ".
3. Turn ignition switch ON.
4. Check the following value 30 minutes after turning the ignition switch ON.
  Low fuel pressure: 206 kPa (2.2 kgf/cm ² , 30 psi) or more
  
  Is inspection result normal?
  
  YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".
  
  NO: Replace low pressure fuel pump. Refer to "REMOVAL AND INSTALLATION ".