LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 519 (Engine Controls - Pinpoint Test A: No Start Through Pinpoint Test DN: Pressure And Temperature Sensors - (Except Diesel & Hybrid)) >> Pinpoint Test DL: Cylinder Head Temperature (CHT) Sensor >> Introduction

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

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 2020 Lincoln Navigator, 2020 Lincoln Nautilus, 2020 Lincoln MKZ, 2020 Lincoln Corsair, and 2020 Lincoln Continental. 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 CHT2 sensor is located in the exhaust manifold.

This pinpoint test is intended to diagnose the following:

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.

G13533223Courtesy 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   96.255
10 50 3.73   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: Cylinder Head Temperature (CHT) Sensor Connector
G13533224Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
CHT (Cylinder Head Temperature) 1
SIGRTN (Signal Return) 2
Fig 2: Cylinder Head Temperature 2 (CHT2) Sensor Connector
G13533225Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
CHT2 (Cylinder Head Temperature 2) 1
SIGRTN (Signal Return) 2
Fig 3: Powertrain Control Module (PCM) Connector - For PCM Connector Views
G13533226Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
CHT2 (Cylinder Head Temperature 2) E40
SIGRTN (Signal Return) E13
scientia non olet · About LEMON Manuals