Test Procedure

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Milan, and 2006 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

DG1 CHECK FOR DTCS

Are DTCs P0325, P0326, P0330, or P0331 present?

Yes	No
For KOER and continuous memory DTCs P0325, P0326, P0330 and P0331, GO to DG2.	For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

DG2 KOER AND CONTINUOUS MEMORY DTCS P0325, P0326, P0330 AND P0331: CHECK THE INTERNAL RESISTANCE OF THE KS

KS connector disconnected.

Measure the resistance between:

( + ) KS Connector, Component Side	( - ) KS Connector, Component Side
Suspect KS+	Suspect KS-

Is the resistance between 4.39M - 5.35M ohms?

Yes	No
GO to DG3.	INSTALL a new KS. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article . CLEAR the DTCs. REPEAT the self-test.

DG3 CHECK THE KS+ CIRCUIT FOR AN OPEN IN THE HARNESS

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS+	Suspect KS+

Is the resistance less than 5 ohms?

Yes	No
GO to DG4.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

DG4 CHECK THE KS- CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS-	Suspect KS-

Is the resistance less than 5 ohms?

Yes	No
GO to DG5.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

DG5 CHECK THE KS+ CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) Vehicle Battery
Suspect KS+	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to DG6.	REPAIR the short circuit to ground. CLEAR the DTCs. REPEAT the self-test.

DG6 CHECK THE KS- CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) Vehicle Battery
Suspect KS-	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to DG7.	REPAIR the short circuit to ground. CLEAR the DTCs. REPEAT the self-test.

DG7 CHECK THE KS+ CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS+	VPWR
Suspect KS+	VREF

Are the resistances greater than 10K ohms?

Yes	No
GO to DG8.	REPAIR the short circuit to voltage. CLEAR the DTCs. REPEAT the self-test.

DG8 CHECK THE KS- CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS-	VREF
Suspect KS-	VPWR

Are the resistances greater than 10K ohms?

Yes	No
GO to DG9.	REPAIR the short circuit to voltage. CLEAR the DTCs. REPEAT the self-test.

DG9 CHECK THE KS+ CIRCUIT FOR INTERMITTENT CONCERNS

NOTE: Carefully wiggle all accessible wiring and connectors associated with the KS circuit.

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS+	Suspect KS+

Is the resistance less than 5 ohms?

Yes	No
GO to DG10.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

DG10 CHECK THE KS- CIRCUIT FOR INTERMITTENT CONCERNS

NOTE: Carefully wiggle all accessible wiring and connectors associated with the KS circuit.

Measure the resistance between:

( + ) KS Connector, Harness Side	( - ) PCM Connector, Harness Side
Suspect KS-	Suspect KS-

Is the resistance less than 5 ohms?

Yes	No
GO to DG11.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

DG11 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.