Saturday, March 3, 2012

Ford Focus Cylinder Head Temperature Sensor?


Cylinder Head Temperature Sensor
OPERATION
REMOVAL & INSTALLATION
TESTING
Temperature sensor testing vaules

Details are as follows :----

Operation



The CHT measures the metal temperature. The CHT sensor can provide complete engine temperature information and can be used to infer coolant temperature. If the CHT sensor conveys an overheating condition to the PCM, the PCM would then initiate a fail-safe cooling strategy based on information from the CHT sensor. A cooling system failure such as low coolant or coolant loss could cause an overheating condition. As a result, damage to major engine components could occur. Using both the CHT sensor and fail-safe cooling strategy, the PCM prevents damage by allowing air cooling of the engine and limp home capability.

Removal & Installation



  1. Disconnect the battery ground cable.
  2. Pull back the cylinder head temperature (CHT) sensor cover and disconnect the electrical connector.
  3. Remove and discard the CHT sensor.
  4. To install, reverse the removal procedure. 

    Click image to see an enlarged view
    Fig. Removing the CHT sensor

Testing



  1. With the key in OFF position and the CHT sensor connector disconnected, measure the resistance between the sensor pins.
  2. Normal resistance is related to engine temperature. See the chart for normal resistance readings.
CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES
TemperatureCHT Sensor Values
°C°FCold End (volts)Hot End (volts)Resistance (K ohms)
0324.14-96.255
10503.73-59.175
20683.26-37.387
30862.74-24.215
401042.23-16.043
501221.76-10.85
601401.36-7.487
701581.04-5.268
801760.793.993.775
851850.693.863.215
901940.603.712.75
952030.533.562.361
1002120.463.412.034
110230-3.071.523
120248-2.741.155
130266-2.410.8866
140284-2.100.6891
150302-1.810.5417
160320-1.550.4301
170338-1.330.3449
180356-1.130.2791
190374-0.960.2278
200392-0.820.1875
210410-0.700.155
220428-0.600.130
230446-0.510.109
240464-0.440.092
250482 0.350.078
260500 0.330.067
This details will help.
Thanks.

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2 comments:

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