Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (see FREEZE FRAME DATA ).

CHECK FUEL LEAK (HIGH PRESSURE SIDE)
1. Check around and beneath the car for gasoline leaks, fumes, etc.
  OK:
  
  No gasoline leaks present.
NG: REPAIR OR REPLACE FUEL SYSTEM

OK: GO TO Next Step

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0087)

Connect the intelligent tester to the DLC3.
Turn the power switch ON (IG) and turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read the DTCs using the intelligent tester.

Result

RESULT CHART

Display (DTC output)	Proceed to
P0087	A
P0087 and other DTCs	B

HINT:

If any codes other than P0087 are output, perform troubleshooting for those DTCs first.

B: GO TO DTC CHART

A: GO TO Next Step

CHECK MISFIRE COUNT (CYL #1, #2, #3, #4, #5 AND #6)

Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
Connect the intelligent tester to the DLC3.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / D-4S TEST / D-4S INJ SWITCH / DIRECT. (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire rate values that are displayed on the tester (example: CYL #1). If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

Shift the shift lever to the D position.
Repeat procedure "A" to "B" above.

Monitor all of the misfire rate values that are displayed on the tester (example: CYL #1).

Result

RESULT CHART

Misfire Count	Proceed to
No misfire counts, or misfire counts occur randomly in all cylinders	A
Misfire counts occur in particular cylinder	B

B: REPLACE FUEL INJECTOR FOR DIRECT INJECTION

A: GO TO Next Step

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (TARGET FUEL PRESS)

Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
Connect the intelligent tester to the DLC3.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / TARGET FUEL PRESS / USER DATA /FUEL PRESS.

Check that the fuel pressure fluctuates when the target fuel pressure changes.

HINT:

The TARGET FUEL PRESS operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 25%.

Result

RESULT CHART

Inspection Result	Proceed to
The fuel pressure changes the correct amount (exact value) according to target fuel pressure commands from the intelligent tester	A
Does not reflect fuel pressure changes	B

A: REPLACE ECM

B: GO TO Next Step

CHECK FUEL LEAK (FUEL RELIEF VALVE)

Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
Connect the intelligent tester to the DLC3.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / FUEL PRESS.

Check that the fuel pressure fluctuates when the fuel return hose is pressed with your fingers.

Result

RESULT CHART

Inspection Result	Proceed to
Pressing the hose raises the fuel pressure slightly	A
Fuel pressure does not fluctuate	B

A: GO TO step 9

B: GO TO Next Step

REPLACE FUEL PUMP (FOR HIGH PRESSURE)

CHECK DTC OUTPUT

Clear DTCs (see DTC CHECK/CLEAR ).
Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
Connect the intelligent tester to the DLC3.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read the DTCs using the intelligent tester.

Result

RESULT CHART

Display (DTC output)	Proceed to
P0087	A
No output	B

B: END

A: GO TO Next Step

INSPECT FUEL PRESSURE SENSOR
1. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
2. Connect the intelligent tester to the DLC3.
3. Turn the tester ON.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / TARGET FUEL PRESS / USER DATA / FUEL PRESS.
5. Check that the fuel pressure fluctuates when the target fuel pressure changes.
  HINT:
  
  The TARGET FUEL PRESS operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure 25%.
  
  OK:
  
  Fuel pressure fluctuates.
NG: REPLACE FUEL PRESSURE SENSOR

OK: REPLACE ECM

INSPECT FUEL RELIEF VALVE

Disconnect the E82 fuel relief valve connector.
Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
Connect the intelligent tester to the DLC3.
Turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / FUEL PRESS.

Check the fuel pressure before disconnecting and after connecting the fuel relief valve connector.

Result

RESULT CHART

Fuel Pressure	Proceed to
Fuel pressure rises	A
Fuel pressure does not change	B

B: REPLACE FUEL RELIEF VALVE

A: GO TO Next Step

INSPECT FUEL RELIEF VALVE RELAY

Remove the fuel relief valve relay from the engine room No. 1 relay block.

Measure the resistance of the fuel relief valve relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

Fig 1: Measuring Resistance Of Fuel Relief Valve Relay

NG: REPAIR FUEL RELIEF VALVE RELAY

OK: REPLACE ECM