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.

RD1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are DTCs P0133, P0134, P06EA, P164A, P207F, P20EE, P2200, P2201, P2209, P220A, P220E, P225A, P249C, P2A00, U029D, U059E, or U05A1 present?

Yes	No
For DTC P06EA, GO to RD2. For DTC P0133, P0134, P164A, P20EE, P2201, P2209, P220A, P249C, P2A00, U029D or U059E, GO to RD3. For DTC P207F, GO to RK7. For all others, GO to RD6.	GO to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX .

RD2 COMPARE THE AAT, EGT AND IAT PID VALUES

NOTE: Allow the exhaust system temperature to stabilize to the ambient temperature for a minimum of 6 hours.

Ignition ON, engine OFF.
Access the PCM and monitor the AAT (TEMP), EGT14 (TEMP) and IAT11 (TEMP) PIDs.

Are the AAT, EGT14, and IAT11 PID readings within 40°C (72°F) of ambient temperature?

Yes	No
GO to RD3.	REFER to the appropriate pinpoint test to DIAGNOSE the sensor that is out of range. For the AAT sensor, GO to Pinpoint Test FA . For the EGT14 sensor, GO to Pinpoint Test RC . For the IAT11 sensor, GO to Pinpoint Test F .

RD3 CHECK FOR OTHER DTCS

Are any DTCs present other than P0133, P0134, P06EA, P164A, P20EE, P2201, P2209, P220A, P249C, P2A00, U029D, or P059E?

Yes	No
GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to RD6.

RD4 CHECK THE REDUCTANT

Check the quality of the reductant sample using the appropriate test equipment.

Does the reductant pass the quality test?

Yes	No
Drive the vehicle for greater than 16 km (10 miles) at a steady state speed. GO to RD6.	GO to RD5.

RD5 REPLACE THE REDUCTANT

Drain and refill the reductant tank with new reductant.
Drive the vehicle for greater than 16 km (10 miles) at a steady state speed.
Carry out the PCM self-test.

Is DTC P207F present?

Yes	No
GO to RD6.	The system is operating correctly at this time.

RD6 CHECK FOR A SOURCE OF POTENTIAL CONTAMINATION

Investigate the following items as potential sources of NOx sensor contamination:
- use of unapproved silicon sealers
- excessive oil consumption
- coolant leaking internally in the engine
- use of unapproved cleaning agents

Is a concern present?

Yes	No
REPAIR the source of the contamination. CHANGE the engine oil and oil filter. Clear the PCM DTCs. REPEAT the self-test.	GO to RD7.

RD7 CARRY OUT A VISUAL INSPECTION

Visually inspect the NOx module wiring, NOx module ground connections, NOx module, and NOx sensor for the following:
- signs of excessive heat
- damaged wiring harness or connectors
- incorrect harness routing
- incorrect PWRGND or SIGGND connections to the frame
Inspect for radio frequency interference/electromagnetic interference (RFI/EMI).

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to RD8.

RD8 CHECK THE VOLTAGE TO NOX MODULE

NOx Module connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) NOx Module Connector, Harness Side	(-)
VPWR - Pin 6	Ground

Is the voltage greater than 10 V?

Yes	No
For DTC P220A, GO to RD12. For all others, GO to RD9.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

RD9 CHECK THE NOX MODULE CIRCUITS FOR AN OPEN

Ignition OFF.
PCM-B connector disconnected.

Measure the resistance between:

(+) NOx Module Connector, Harness Side	(-) PCM-B Connector, Harness Side
CAN2+ - Pin 5	CAN2+ - Pin 56
CAN2- - Pin 2	CAN2- - Pin 39

Measure the resistance between:

(+) NOx Module Connector, Harness Side	(-)
PWRGND - Pin 1	Ground
GND - Pin 4	Ground

Are the resistances less than 5 ohms?

Yes	No
For DTCs P0133, P06EA, P164A, P207F, P2A00, P2200, P2201 or P220E, GO to RD10. For DTC P225A, GO to RD11. For all others, GO to RD12.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

RD10 INSTALL A NEW NOX SENSOR

Install a new NOx sensor. Refer to the Electronic Engine Controls article.
For DTC P207F,
Carry out the diesel particulate filter manual regeneration with the scan tool.
Drive the vehicle for greater than 16 km (10 miles) at a steady state speed.
For all others,
Carry out a drive cycle. Refer to DRIVE CYCLES .
Carry out the PCM self-test.

Are any DTCs present?

Yes	No
For DTC P207F, INSTALL a new Selective Catalytic Reduction (SCR) Catalyst. REFER to the appropriate Exhaust System article. Clear the PCM DTCs. REPEAT the self-test. For DTC P2200 or P06EA, GO to RD12. For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	The system is operating correctly at this time. Clear the PCM DTCs. REPEAT the self-test.

RD11 CHECK THE NOX MODULE FOR THE LATEST CALIBRATION

NOx Module connector connected.
PCM-B connector connected.
Check the NOx module for the correct calibration version number.

Does the NOx module calibration version number match the PCM?

Yes	No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.	Reprogram the NOx module.

RD12 CHECK FOR CORRECT NOX MODULE OPERATION

Disconnect all the NOx module connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the NOx module connectors and make sure they seat correctly.

Is the concern still present?

Yes	No
GO to RD13.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

RD13 INSTALL A NEW NOX MODULE

Install a new NOX module. Refer to the Electronic Engine Controls article.
Carry out diesel particulate filter regeneration.
Carry out a drive cycle. Refer to DRIVE CYCLES .

Are any DTCs present?

Yes	No
For DTC P0134, P2209 or U059E, INSTALL a new NOx sensor. REFER to the Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test. For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	The system is operating correctly at this time.