Pinpoint Test DL: Cylinder Head Temperature (CHT) Sensor

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: On a typical vehicle, the CHT sensor is located in the cylinder head and the cylinder head temperature 2 sensor is located in the exhaust manifold.

Refer to ELECTRONIC ENGINE CONTROLS - 3.0L DIESEL for schematic and connector information.

Normal Operation and Fault Conditions

On applications that do not use an ECT sensor, the CHT sensor is used to determine the engine coolant temperature. To cover the entire temperature range of both the CHT and ECT sensors, the PCM has a dual switching resistor circuit on the CHT input. A graph showing the temperature switching from the COLD END line to the HOT END line, with increasing temperature and back with decreasing temperature is included. Note the temperature to voltage overlap zone. Within this zone it is possible to have either a COLD END or HOT END value at the same temperature. For example, at 90°C (194°F) the voltage could read either 0.60 volt or 3.71 volts. Refer to the table for the expected values.

Voltage values calculated for reference voltage = 5 volts. These values can vary by 15% due to sensor and reference voltage variations.

Courtesy of FORD MOTOR COMPANY

Refer to the DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P1022:00	Cylinder Head Temperature Sensor 2 Circuit Low: No Sub Type Information	Sets when the PCM detects a CHT2 circuit concern is present.
PCM P1023:00	Cylinder Head Temperature Sensor 2 Circuit High: No Sub Type Information	Sets when the PCM detects a CHT2 circuit concern is present.
PCM P2C3A:00	Cylinder Head Temperature Sensor "B" Circuit Low: No Sub Type Information	Sets when the PCM detects the CHT2 circuit is shorted to ground. This DTC illuminates the malfunction indicator lamp (MIL).
PCM P2C3B:00	Cylinder Head Temperature Sensor "B" Circuit High: No Sub Type Information	Sets when the PCM detects a CHT2 circuit concern is detected. This DTC illuminates the MIL.

Possible Sources

CHT sensor circuitry concern
CHT sensor (6G004)
PCM (12A650)

PINPOINT TESTS DL: CYLINDER HEAD TEMPERATURE (CHT) SENSOR (Gas)

PINPOINT TESTS DL: CYLINDER HEAD TEMPERATURE (CHT) SENSOR (Diesel)