Test Procedure

AR1 CHECK FOR DTCS

Are DTCs P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 present?

Yes	No
GO to AR3.	GO to AR2.

AR2 RECREATE THE MISFIRE SYMPTOM USING FREEZE FRAME AND CUSTOMER INFORMATION

NOTE: To recreate the original conditions that set the DTC or caused the symptom, the vehicle may require driving.

Access the misfire freeze frame data (if available) and record the operating conditions.
Obtain information from the customer information worksheet or any other available data from the customer.
Recreate the misfire symptom using the freeze frame and customer information.

Can the symptom be recreated?

Yes	No
GO to AR3.	Unable to duplicate or identify the concern at this time. REFER to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , if a driveability concern exists.

AR3 CHECK FOR OTHER NON-MISFIRE CONTINUOUS MEMORY DTCS

Are there any non-misfire continuous memory DTCs present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to AR4.

AR4 CHECK FOR DTCS

Are any DTCs present other than P0300, P0301, P0302, P0303, P0304 P0305, P0306, P0307 or P0308?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to AR5.

AR5 CHECK THE LOW PRESSURE FUEL SYSTEM

NOTE: The fuel pump runs for 30 seconds then shuts off at ignition ON, engine OFF.

NOTE: On some vehicles, the FP PID may not turn off the fuel pump. Cycle the ignition from ON to OFF to command the fuel pump OFF.

Is the FLP PID greater than 379 kPa (55 psi)?

Yes	No
GO to AR6.	GO to PINPOINT TEST MA .

AR6 RELATIVE COMPRESSION TEST

Carry out the Relative Compression Test. Refer to the scan tool manufacturer's manual for specific information on the scan tool setup, operation, and specific cables and adapters required.

Do all cylinders pass the test?

Yes	No
GO to AR7.	GO to AR9.

AR7 CYLINDER POWER BALANCE CHECK

Carry out the Power Balance Test. Refer to the scan tool manufacturer's manual for specific information on the scan tool setup, operation, and specific cables and adapters required.

Are all cylinders contributing correctly during the power balance test?

Yes	No
GO to PINPOINT TEST M .	GO to AR8.

AR8 CHECK THE SUSPECT FUEL INJECTOR RESISTANCE AT THE FUEL INJECTOR

NOTE: Only diagnose the fuel injectors for the cylinders identified as weak during the power balance test.

(+) Suspect Fuel Injector Connector, Component Side	(-) Suspect Fuel Injector Connector, Component Side
INJ	INJRTN

Is the resistance between 150K - 210K ohms?

Yes	No
GO to AR9.	GO to PINPOINT TEST P .

AR9 CARRY OUT A CYLINDER COMPRESSION TEST ON THE SUSPECT CYLINDER

Carry out a cylinder compression test on the suspect cylinder. Refer to the appropriate Engine article.

Are any concerns present?

Yes	No
REPAIR as necessary. Refer to the appropriate Engine article. Clear the PCM DTCs. REPEAT the self-test.	GO to AR10.

AR10 CHECK FOR A LEAKING FUEL INJECTOR

Is there any fuel mist from the glow plug hole?

Yes	No
INSTALL a new Fuel Injector. REFER to the appropriate Fuel Charging and Controls article. Clear the PCM DTCs. REPEAT the self-test.	GO to PINPOINT TEST M .