Test Procedure

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2013 Lincoln Navigator, 2013 Lincoln MKZ, 2013 Lincoln MKX, 2013 Lincoln MKT, and 2013 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.

DG1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: For Fiesta, an incorrectly installed KS may set a DTC. Verify the KS is correctly installed before continuing diagnosis. REFER to the appropriate Electronic Engine Controls article.

Are DTCs P0325, P0326, P0327, P0328, P0330, P0331, P0332, P0333 or P130D present?

Yes	No
For DTC P130D, GO to DG7. For all others, GO to DG2 .	For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

DG2 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 4.39 - 5.35 Mohms?

Yes	No
GO to DG3 .	INSTALL a new KS. REFER to the appropriate Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.

DG3 CHECK THE KS CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

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

Are the resistances less than 5 ohms?

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

DG4 CHECK THE KS CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

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

Are the resistances greater than 10K ohms?

Yes	No
GO to DG5 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DG5 CHECK THE KS CIRCUIT FOR A SHORT TO VOLTAGE

Measure the resistance between:

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

Are the resistances greater than 10K ohms?

Yes	No
GO to DG6 .	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

DG6 CHECK THE KS CIRCUIT FOR INTERMITTENT CONCERNS

While observing the resistance, wiggle, shake, and bend small sections of the wiring harness working from the sensor to the PCM.

Measure the resistance between:

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

Are the resistances less than 5 ohms?

Yes	No
GO to DG7 .	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DG7 IDENTIFY THE TYPE OF KNOCK

NOTE: Knock counts on a single cylinder may indicate a concern with the ignition or fuel components for the suspect cylinder. Knock counts distributed among multiple cylinders may indicate a fuel quality concern.

Ignition ON, engine running.
Access the PCM and monitor the KNK_CNTR_CYL1 (MODE), KNK_CNTR_CYL2 (MODE), KNK_CNTR_CYL3 (MODE), KNK_CNTR_CYL4 (MODE), KNK_CNTR_CYL5 (MODE) and KNK_CNTR_CYL6 (MODE) PIDs.

Are the majority of the knock counts on a single cylinder?

Yes	No
DIAGNOSE ignition coil and fuel injection components for the suspect cylinder. REPAIR or INSTALL a new component as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to DG8 .

DG8 CHECK THE LEARNED OCTANE ADJUSTMENT

Access the PCM and monitor the OCTADJ_R_LRND (PER) PID.

Does the OCTADJ_R_LRND PID read less than 15%?

Yes	No
DRAIN and CLEAN the fuel system, REFILL with correct grade fuel. Clear the PCM DTCs. REPEAT the self-test.	GO to DG9 .

DG9 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.
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) , Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.