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Where is the coolant temp sensor located? Ford shows 2 sensors, The cylinder head temp sensor and a coolant temp sensor. I've replaced the CHT sensor but can't find the other.

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  • syspro Dec 12, 2014

    Hi Justin Scott, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? year and model

  • Justin Scott Dec 12, 2014

    It is a 2008 Ford F150 with a 5.4


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5.4 Only uses CHT sensor for CTS.

Posted on Dec 12, 2014

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Posted on Dec 12, 2014

Testimonial: "No... It's not anywhere on the top of the engine. The CHT sensor is."

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1 Answer

Where is located the 2006 ford focus of 2.0 engine coolant module temperature sensor

It doesn't have a coolant sensor it has a CHT, cylinder head temperature sensor. This type of sensor is much more precise measuring engine operating temperature.

Oct 13, 2016 | 2006 Ford Focus

2 Answers

My toyota hilux 2007 model starts well produces alot of white smook idles roughly when i scan i will have this code p1290 so What do i do

Without looking at any computer code I will tell you that is definately in the emissions of the vehicle, try have the sensor replaced that is associated with the fuel system, there are several sensors on vehicles, but if it putting off alot of white smoke its running too rich for one and 2 it probaby gets better when the vehicle is warmed up the motor, definately check the exhaust of the vehicle too hope this helps

Apr 27, 2016 | Toyota Cars & Trucks

1 Answer

4.6 L. V8 Triton. Where is the CHT sensor located?

Cylinder Head Temperature (CHT) Sensor -4.6L and 5.4L Removal
  1. Remove the intake manifold; refer to Section 303-01B .
  1. Remove the cylinder head temperature (CHT) sensor.
    1. Disconnect the connector.
    1. Remove the CHT sensor.

Feb 22, 2016 | 1998 Ford F150 Regular Cab

1 Answer

Diagnostic code P1290 means what? I can not find it anywhere. Please help Thank you

P1290 Ford
P1290 Ford - Cylinder Head Temperature Sensor Signal Less Than Self-Test Range

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3 What does this mean?

Forum Code

Possible causes

- Wrong thermostat

- Not at operating range

- Engine overheated

- Low engine coolant level

- Faulty Cylinder Head Temperature (CHT) sensor

- Cylinder Head Temperature (CHT) sensor harness is open or shorted

- Cylinder Head Temperature (CHT) sensor circuit poor electrical connection

What does this mean?

When is the code detected?

The Engine Control Module (ECM) detected the cylinder head temp below expected values

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1290 Ford Description

The Cylinder Head Temperature (CHT) Sensor is mounted into the wall of the cylinder head and is not connected to any coolant passages. The CHT sends a signal to the Powertrain Control Module (PCM) indicating the cylinder head temperature. If the temperature exceeds 126°C (-258°F), the PCM disables four fuel injectors at a time. The PCM will alternate which four injectors are disabled every 32 engine cycles. The four cylinders that are not being fuel injected act as air pumps to aid in cooling the engine. If the temperature exceeds 154 °C (310°F), the PCM disables all of the fuel injectors until the engine temperature drops below 154°C (310°F).

Read more:

Aug 11, 2015 | Cars & Trucks

1 Answer

I have a 2000 crown vic and my coolant fan wont come on unless i cut the a/c on or unplugged the cylinder head sensor i changed thermostat and temp sensor it still same thing what could be the problem

You have a wiring problem from sensor to the PCM - engine computer .
    Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
  • Disconnect PCM.
  • Measure resistance between CHT signal and SIG RTN circuits and then between CHT signal and PWR GND circuits at the PCM harness connector.
  • the PCM is what controls the cooling fan !
  • This Pinpoint Test is intended to diagnose the following:
    • Cylinder head temperature (CHT) sensor (6G004)
    • Harness circuits: CHT, VREF, and SIG RTN
    • Powertrain control module (PCM) (12A650)

    Tables and Graphs

    On applications that do not use a ECT sensor, the CHT sensor is used to determine the engine coolant temperature in place of the ECT sensor. In this case the PCM may store both CHT and ECT Diagnostic Trouble Codes (DTCs). 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 voltage 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 temperature to voltage expected values.
    Voltage values were calculated for VREF = 5.0 volts. These values can vary 15 percent due to sensor and VREF variations.
    • Run engine at 2000 rpm until engine temperature becomes stabilized.
    • No Starts or Vehicle that Stalls:
      • GO to DL3 .
    • Check that upper radiator hose is hot and pressurized.
    • Rerun Key On Engine Running (KOER) Self-Test.
    Is DTC P1288 or P1116 present? Yes No GO to DL2 . Engine temperature was not stabilized. REPAIR any other DTCs as necessary. DL2 CHECK VREF CIRCUIT VOLTAGE AT TP SENSOR
    • Refer to schematic at the beginning of this pinpoint test.
    • Disconnect throttle position (TP) sensor.
    • Key on, engine off.
    • Measure the voltage between VREF and SIG RTN circuits at the TP sensor harness connector.
    Is voltage between 4.0 volts and 6.0 volts? Yes No There is sufficient VREF voltage. RECONNECT TP sensor. GO to DL3 . GO to C1 . DL3 CHECK RESISTANCE OF CYLINDER HEAD TEMPERATURE SENSOR WITH ENGINE OFF
    • Disconnect CHT sensor.
    • Measure resistance between CHT signal and SIG RTN pins at the CHT sensor. Refer to the table at the beginning of this pinpoint test for resistance specifications.
    Is resistance within specification? Yes No For No Starts or Stalls, RETURN to Section 3 , Symptom Charts.

    All others, GO to DL4 . REPLACE CHT sensor. You need a scan tool to do some of these tests
      Note: Verify that engine is at operating temperature before taking CHT readings.
    • Run engine for two minutes at 2000 rpm.
    • Measure resistance between CHT signal and SIG RTN pins at the CHT sensor. Refer to the table at the beginning of this Pinpoint Test for resistance specifications.
    • Key off.
    Is resistance within specification? Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). REPLACE CHT sensor. DL5 DTC P1289 OR P1290: ACCESS CHT PID AND CHECK VOLTAGE
    • Connect scan tool.
    • Key on, engine off.
    • Access CHT V PID.
      Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
    • Disconnect PCM.
    • Measure resistance of CHT circuit between PCM harness connector pin and CHT sensor harness connector.
    • Measure resistance of SIG RTN circuit between PCM harness connector pin and CHT sensor harness connector.
    Is each resistance less than 5.0 ohms? Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). REPAIR open circuits. free wiring diagrams at

Jul 13, 2015 | Cars & Trucks

1 Answer

Cooling problem,code#P1299,on a 06 Ford Escape 2.3l

P1299 - Cylinder Head Over Temperature Protection Active Description: Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM strategy called fail-safe cooling was activated to cool the engine. Possible Causes:
  • Engine cooling system concerns
  • Low engine coolant level
  • Base engine concerns
Diagnostic Aids: Refer to Section 1, Powertrain Control Software , for more information on the fail-safe cooling strategy and cylinder head temperature sensor. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DL .

Feb 19, 2015 | 2006 Ford Escape

1 Answer

2001 Excursion 6.8 V10, hard start, high idle, code P1288 KOEO, and KOER, no memory codes, with temp gauge in normal range scan data reads 20 deg F, suspect CHT sensors looking for sensor location.

CHT -cylinder head temperature sensor located under the intake have to remove intake manifold to replace sensor its in the cylinder head.

Oct 22, 2013 | Ford Cars & Trucks

1 Answer

Can not find the location of the CHT sensor for a 2001 ford expedtion please help find

CHT- Cylinder Head Temperature Sensor

I do not know the exact location
On my Lincoln LS, it is in the intake side of
the cyl head & not really too accessible

They are used instead of a Coolant Temp
Sensor and will also be one of 2 Fail Safes
that can occur. The other is the Throttle Body
Motor (TACM) ETC Failsafe

I wouldn't rush off to replace it,without knowing
how to test it.

I will check here in awhile & let you know if I
can shed some light on it.

Obviously a professional scan tool is always
the place to start.

Apr 26, 2011 | Ford Expedition Cars & Trucks

1 Answer

Need to located the temperature sensor on 2002 ford f-150 4.2

The coolant temperature is measured from the cylinder head temperature sensor CHT and is located on the drivers side cylinder head in the rear. It is connected to the harness by connector C107 and has gray/red and yellow/light green wires going to pins 39 and 55 of the processor.

Apr 07, 2011 | 2002 Ford F150 Regular Cab

1 Answer

Location of CHT sensor

It is located at the back of the passenger side cylinder head close to where the intake manifold and head meet.It will have a YE/LG and GY/RD wires to it.

May 24, 2009 | 2005 Ford Expedition

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