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.

F1 PRELIMINARY DIAGNOSIS

NOTE: Diagnose circuit faults prior to range or performance faults.

Is DTC P0111, P0112 or P0113 present?

Yes	No
GO to F2.	GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

F2 CHECK FOR VOLTAGE AT THE SENSOR

Ignition OFF.
MAF/IAT Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) MAF/IAT Sensor Connector, Harness Side	(-)
VPWR - Pin 3	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to F3.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

F3 CHECK FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM-B connector disconnected.

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-) PCM-B Connector, Harness Side
IAT - Pin 2	IAT - Pin 47

Is the resistance less than 5 ohms?

Yes	No
GO to F4.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

F4 CHECK FOR A SHORT BETWEEN CIRCUITS IN THE HARNESS

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-)
IAT - Pin 2	Ground

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-) MAF/IAT Sensor Connector, Harness Side
IAT - Pin 2	VPWR - Pin 3
IAT - Pin 2	MAFRTN - Pin 4
IAT - Pin 2	MAF - Pin 5

Are the resistances greater than 10K ohms?

Yes	No
GO to F5.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

F5 CHECK FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition ON, engine OFF.

Measure the voltage between:

(+) MAF/IAT Sensor Connector, Harness Side	(-)
IAT - Pin 2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to F6.

F6 INTERMITTENT CHECK

Ignition ON, engine OFF.
Access the PCM and monitor the IAT11_V (VOLT) PID.
While observing the PID, carry out the following:
- Wiggle all accessible harness from the MAF/IAT sensor to the PCM and lightly tap on the sensor.
- Wiggle the MAF/IAT sensor connector.
- Look for sudden changes in the voltage when the harness and connector are wiggled or when the MAF/IAT sensor is tapped.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to F7.

F7 TEMPERATURE SENSOR CORRELATION

NOTE: Check temperature values while engine is at ambient temperature, cold soak the engine for a minimum of 8 hours if necessary.

Ignition ON, engine OFF.
Access the PCM and monitor the AAT (TEMP), CAC_T (TEMP), IAT11 (TEMP), ECT2 (TEMP) and EGRT11 (TEMP) PIDs.
The IAT11 temperature must be within the following ranges:
- Within 15°C (27°F) degrees of the AAT reading
- Within 16°C (28.8°F) degrees of the CAC_T reading
- Within 20°C (36°F) degrees of the ECT2 reading
- Within 20°C (36°F) degrees of the EGRT11 reading

Is the IAT11 PID within specification?

Yes	No
Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary.	INSTALL a new MAF/IAT sensor. REFER to the appropriate Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test. If the concern or DTC is still present, GO to F8.

F8 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.