Test Procedure

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

KG1 DTCS P0201 THROUGH P0204: CHECK FOR SELF-TEST DTCS

Are any of the following DTCs present during the PCM self-test: P0201 through P0204?

Yes	No
For DTCs P0201 through P0204, GO to KG2.	For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

KG2 CHECK THE VPWR CIRCUIT FOR AN OPEN IN THE HARNESS

NOTE: Disconnect the suspect fuel injector harness connector. Only the suspect injector needs to be diagnosed.

Key in OFF position.
Fuel Injector connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) Fuel Injector Connector, Harness Side	( - )
VPWR - Pin 2	Ground

Is the voltage greater than 10 V?

Yes	No
GO to KG3.	REPAIR the open circuit.

KG3 CHECK THE SUSPECT INJ CIRCUIT FOR AN OPEN IN THE HARNESS

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

( + ) PCM Connector, Harness Side	( - ) Fuel Injector Connector, Harness Side
Suspect INJ	INJ - Pin 1

Is the resistance less than 5 ohms?

Yes	No
GO to KG4.	REPAIR the open circuit.

KG4 CHECK THE SUSPECT INJ CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

( + ) Fuel Injector Connector, Harness Side	( - )
INJ - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KG5.	REPAIR the short circuit.

KG5 CHECK THE SUSPECT INJ CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Key ON, engine OFF.

Measure the voltage between:

( + ) Fuel Injector Connector, Harness Side	( - )
INJ - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit.	GO to KG6.

KG6 CHECK THE RESISTANCE OF THE SUSPECT FUEL INJECTOR

Measure the resistance between:

( + ) Fuel Injector Connector, Component Side	( - ) Fuel Injector Connector, Component Side
VPWR - Pin 2	INJ - Pin 1

Is the resistance between 11 ohms - 18 ohms?

Yes	No
GO to KG7.	INSTALL a new fuel injector. RESET the keep alive memory (KAM). REFER to RESETTING THE KEEP ALIVE MEMORY (KAM) .

KG7 CHECK THE FUNCTIONALITY OF THE SUSPECT INJ CIRCUIT

Key in OFF position.
PCM connector connected.
Key ON, engine OFF.

Connect a non-powered test lamp between:

( + ) Fuel Injector Connector, Harness Side	( - ) Fuel Injector Connector, Harness Side
VPWR - Pin 2	INJ - Pin 1

Key ON, engine running.

Is the test lamp blinking?

Yes	No
GO to KG8.	GO to KG9.

KG8 CARRY OUT A THOROUGH WIGGLE TEST ON THE SUSPECT FUEL INJECTOR HARNESS

Key in OFF position.
Fuel Injector connector connected.
Key ON, engine running.
Engine at normal operating temperature.
Access the PCM and monitor the INJ PID.
Wiggle, shake, and bend small sections of the wiring harness while working from the fuel injector to the PCM.

Are any injector values fluctuating in and out of range?

Yes	No
ISOLATE the fault and REPAIR as necessary.	Unable to duplicate or identify the fault at this time. GO to Pinpoint Test Z .

KG9 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins.
- corrosion.
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test and verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.