Test Procedure

WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

F1 PRELIMINARY DIAGNOSIS

NOTE: Diagnose circuit DTCs before range or performance DTCs.

Are DTCs P009A, P0110, P0111, P0112 or P0113 present?

Yes	No
For F-Series Super Duty, GO to F2. For all others, GO to F3.	RETURN to SYMPTOM CHARTS for further direction.

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	(-) MAF/IAT Sensor Connector, Harness Side
VREF	SIGRTN

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to F3.	GO to PINPOINT TEST B .

F3 CHECK FOR AN OPEN

Ignition OFF.
For Transit,
PCM-T connector disconnected.

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-) PCM-T Connector, Harness Side
IAT	IAT - Pin 9
SIGRTN	SIGRTN - Pin 15

For all others,
PCM-B connector disconnected.

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-) PCM-B Connector, Harness Side
IAT	IAT
SIGRTN	SIGRTN

Are the resistances 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 TO GROUND

Measure the resistance between:

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

Measure the resistance between:

(+) MAF/IAT Sensor Connector, Harness Side	(-) MAF/IAT Sensor Connector, Harness Side
IAT	SIGRTN

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

Ignition ON, engine OFF.

Measure the voltage between:

(+) MAF/IAT Sensor Connector, Harness Side	(-)
IAT	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.	For F-150 and Transit with DTCs P0112 or P0113, INSTALL a new MAF/IAT sensor. Clear the PCM DTCs. REPEAT the self-test. For all others, 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), ECT2_1 (TEMP) and EGRTC (TEMP) PIDs.
For Transit,
Access the PCM and monitor the IAT (TEMP) PID.
For all others,
Access the PCM and monitor the IAT11 (TEMP) PID.
The IAT 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_1 reading (F-650/F-750, F-Series Super Duty)
- Within 20°C (36°F) degrees of the EGRTC 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 Electronic Engine Controls article. Clear the PCM DTCs. REPEAT the self-test.