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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 473 (ENGINE CONTROLS - PINPOINT TESTS (DIESEL))PINPOINT TESTS DL: CYLINDER HEAD TEMPERATURE (CHT) SENSORINTRODUCTION
2021 Ford Edge SE, 4WD

Pinpoint Tests DL: Cylinder Head Temperature (CHT) Sensor: Introduction

2021 Ford Edge SE, 4WDSECTION Introduction
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NOTE: On a typical vehicle, the CHT sensor is located in the cylinder head and the CHT2 sensor is located in the exhaust manifold.

This pinpoint test is intended to diagnose the following:

  • cylinder head temperature (CHT) sensor (6G004)
  • cylinder head temperature 2 (CHT2) sensor (6G004)
  • harness circuits: CHT, CHT2, and SIGRTN
  • PCM (12A650)

On applications that do not use an engine coolant temperature (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 VREF = 5 volts. These values can vary by 15% due to sensor and VREF variations.

G13533583Courtesy of FORD MOTOR CO.
CYLINDER HEAD TEMPERATURE (CHT) AND CHT2 SENSOR EXPECTED VALUES

Temperature CHT Sensor Values
°C °F Cold End (volts) Hot End (volts) Resistance (K ohms)
-40 -40 4.89 - 965.808
-30 -22 4.81 - 513.019
-20 -4 4.67 - 283.664
-10 14 4.45 - 162.584
0 32 4.14 1 - 96.255
10 50 3.73 1 - 59.175
20 68 3.26 - 37.387
30 86 2.74 - 24.215
40 104 2.23 - 16.043
50 122 1.76 - 10.85
60 140 1.36 - 7.487
70 158 1.04 - 5.268
80 176 0.79 3.99 3.775
85 185 0.69 3.86 3.215
90 194 0.60 3.71 2.75
95 203 0.53 3.56 2.361
100 212 0.46 3.41 2.034
110 230 - 3.07 1.523
120 248 - 2.74 1.155
130 266 - 2.41 0.8866
140 284 - 2.10 0.6891
150 302 - 1.81 0.5417
160 320 - 1.55 0.4301
170 338 - 1.33 0.3449
180 356 - 1.13 0.2791
190 374 - 0.96 0.2278
200 392 - 0.82 0.1875
210 410 - 0.70 0.155
220 428 - 0.60 0.130
230 446 - 0.51 0.109
240 464 - 0.44 0.092
250 482   0.35 0.078
260 500   0.33 0.067
Fig 1: Powertrain Control Module-E (PCM-E) Connector
G13533584Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
Fig 2: Powertrain Control Module-T (PCM-T) Connector
G13533585Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.