Test Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2019 Ford Transit-350 HD, 2019 Ford Transit-350, 2019 Ford Transit-250, 2019 Ford Transit-150, and 2019 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

DL1 CHECK FOR DTCS

Are DTCs P1022, P1023, P2C3A, or P2C3B present?

Yes	No
GO to DL2.	RETURN to SYMPTOM CHARTS for further direction.

DL2 CHECK THE RESISTANCE OF THE CHT2 SENSOR WITH THE ENGINE OFF

NOTE: Refer to the chart at the beginning of this test for the resistance specifications.

Ignition OFF.
CHT2 Sensor connector disconnected.

Measure the resistance between:

(+) CHT2 Sensor Connector, Component Side	(-) CHT2 Sensor Connector, Component Side
CHT2	SIGRTN

Is the resistance within specification?

Yes	No
GO to DL3.	INSTALL a new CHT2 sensor. REFER to the Electronic Engine Controls article. CLEAR the DTCs. REPEAT the self-test.

DL3 CHECK FOR AN OPEN CIRCUIT

Ignition OFF.
PCM-E connector disconnected.
For F150,
PCM-T connector disconnected.

Measure the resistance between:

(+) PCM-T Connector, Harness Side	(-) CHT2 Sensor Connector, Harness Side
CHT2 - Pin 40	CHT2

Measure the resistance between:

(+) PCM-E Connector, Harness Side	(-) CHT2 Sensor Connector, Harness Side
SIGRTN	SIGRTN

For all others,

Measure the resistance between:

(+) PCM-E Connector, Harness Side	(-) CHT2 Sensor Connector, Harness Side
CHT2	CHT2
SIGRTN	SIGRTN

Are the resistances less than 5 ohms?

Yes	No
GO to DL4.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DL4 CHECK FOR A SHORT TO GROUND

Measure the resistance between:

(+) CHT2 Sensor Connector, Harness Side	(-)
CHT2	Ground

Are the resistances greater than 10K ohms?

Yes	No
GO to DL5.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

DL5 CHECK FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) CHT2 Sensor Connector, Harness Side	(-)
CHT2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to DL6.

DL6 CHECK THE RESISTANCE OF THE CHT SENSOR

NOTE: Refer to the chart at the beginning of this test for the resistance specifications.

Ignition OFF.
CHT2 Sensor connector connected.
PCM-E connector connected.
PCM-T connector connected.
Run the engine until the engine temperature stabilizes.
Ignition OFF.
CHT2 Sensor connector disconnected.

Measure the resistance between:

(+) CHT2 Sensor Connector, Component Side	(-) CHT2 Sensor Connector, Component Side
CHT2	SIGRTN

Is the resistance within specification?

Yes	No
GO to DL7.	INSTALL a new CHT2 sensor. REFER to the Electronic Engine Controls article. CLEAR the DTCs. REPEAT the self-test.

DL7 CHECK THE CHT2 SENSOR

Ignition ON, engine OFF.

Measure the voltage between:

(+) CHT2 Sensor Connector, Harness Side	(-) CHT2 Sensor Connector, Harness Side
CHT2	SIGRTN

Observe the digital multi meter (DMM) for an indication of a concern while shaking, wiggling, and bending the CHT2 circuit between the CHT2 and the PCM. Note that voltage changes suddenly when a concern is detected.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to DL8.

DL8 TEMPERATURE SENSOR CORRELATION

NOTE: Cold soak the vehicle at ambient temperature for at least 6 hours while not in direct sunlight.

NOTE: All PID's may not be available on all vehicles.

Ignition OFF.
CHT2 Sensor connector connected.
Ignition ON, engine OFF.
Access the PCM and monitor the AAT (TEMP), CHT2 (TEMP), ECT (TEMP) and ECT1 (TEMP) PIDs.

Are the PID values within 16.67°C (30°F) of each other?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST ZZ .	INSTALL a new CHT2 sensor. REFER to the Electronic Engine Controls article. CLEAR the DTCs. Clear the PCM DTCs. REPEAT the self-test.