Test Procedure

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

V1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are any DTCs present other than P0016, P0340, or P0341?

Yes	No
GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to V2.

V2 CHECK THE VOLTAGE TO THE CMP SENSOR

CMP Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) CMP Sensor Connector, Harness Side	(-)
VREF - Pin 1	Ground

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to V3.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

V3 CHECK THE CMP SENSOR CIRCUITS FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM-E connector disconnected.

Measure the resistance between:

(+) CMP Sensor Connector, Harness Side	(-) PCM-E Connector, Harness Side
CMP - Pin 2	CMP - Pin 32
SIGRTN - Pin 3	SIGRTN - Pin 47

Are the resistances less than 5 ohms?

Yes	No
GO to V4.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

V4 CHECK THE CMP SENSOR CIRCUITS FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

(+) CMP Sensor Connector, Harness Side	(-)
CMP - Pin 2	Ground
SIGRTN - Pin 3	Ground

Are the resistances greater than 10K ohms?

Yes	No
GO to V5.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

V5 CHECK THE CMP SENSOR CIRCUITS FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition ON, engine OFF.

Measure the voltage between:

(+) CMP Sensor Connector, Harness Side	(-)
CMP - Pin 2	Ground
SIGRTN - Pin 3	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to V6.

V6 CHECK THE CMP SENSOR FOR CORRECT OPERATION

Ignition OFF.
PCM-E connector connected.

Connect a 5 amp fused jumper wire between the following:

Point A CMP Sensor Connector, Harness Side	Point B CMP Sensor Connector, Component Side
VREF - Pin 1	VREF - Pin 1
CMP - Pin 2	CMP - Pin 2
SIGRTN - Pin 3	SIGRTN - Pin 3

Ignition ON, engine OFF.

Measure the voltage between:

(+) CMP Sensor Connector, Component Side	(-)
CMP - Pin 2	Ground

Record the voltage.
Ignition ON, engine running.

Measure the voltage between:

(+) CMP Sensor Connector, Component Side	(-)
CMP - Pin 2	Ground

Record the voltage.

Is the voltage reading less than 0.5V with the ignition ON, engine OFF and greater than 2V with the ignition ON, engine running?

Yes	No
GO to V7.	GO to V8.

V7 INSPECT THE HARNESS

Ignition OFF.
Remove the jumper wire(s).
Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems.
Check the CMP sensor connector for damage or corrosion.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to V9.

V8 CHECK THE CMP SENSOR

Ignition OFF.
Remove the jumper wire(s).
Inspect the CMP sensor connector for damaged or corroded pins.
Remove the CMP sensor.
Inspect the CMP sensor for misalignment and improper installation.
Inspect the CMP sensor for damage.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	INSTALL a new CMP sensor. REFER to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.

V9 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) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.