Engine Controls - Sensor Operating Range Charts: Introduction

NOTE: Information for Escort also applies to ZX2, unless otherwise indicated.

NOTE: For sensor information on Villager, see SENSOR OPERATING RANGE CHARTS - VILLAGER. For sensor information on 7.3L diesel, see SELF-DIAGNOSTICS - EEC-V (DIESEL) article.

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it will cause driveability problems.

NOTE: Unless specified otherwise, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance.

BARO SENSOR SPECIFICATIONS ⁽¹⁾

In. Hg

Volts

Frequency (Hz)

17.1

2.45

122.4

18.3

2.65

125.5

19.5

2.85

128.7

20.7

3.05

131.9

21.8

3.25

135.1

23.0

3.45

138.3

24.2

3.65

141.8

25.4

3.85

145.4

26.6

4.05

148.9

27.7

4.25

152.5

28.9

4.45

156.1

30.1

4.65

159.6

31.0

4.80

162.4

⁽¹⁾	Using scan tool, select BARO PID from PID/DATA monitor menu. Using a vacuum pump, apply vacuum to BARO vent. Compare PID readings with table specifications. For additional testing, see TEST DQ under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

CYLINDER HEAD TEMPERATURE (CHT) SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

Volts

⁽²⁾ Ohms

-40 (-40)

4.89

965,808

-22 (-30)

4.81

513,019

-4 (-20)

4.67

283,664

14 (-10)

4.45

162,584

32 (0)

4.14

96,255

68 (20)

3.26

37,387

104 (40)

2.23

16,043

158 (70)

1.04

5268

185 (85) ⁽³⁾

.69 Or 3.86

3215

194 (90) ⁽³⁾

.60 Or 3.71

2750

212 (100) ⁽³⁾

.46 Or 3.41

2034

248 (120)

2.74

1155

284 (140)

2.10

689

302 (150)

1.81

542

320 (160)

1.55

430

338

1.33

345

356

1.13

279

374

.96

228

392

.82

188

410

.70

155

428

.60

130

446

.51

109

464

.44

482

.35

500

.33

⁽¹⁾	Value may vary by 15 percent. For additional testing, see TEST DL under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

⁽²⁾	Measure resistance between CHT sensor terminals.

⁽³⁾	At this temperature, there is a voltage overlap zone where it is possible to have either a cold end (low voltage) or hot end (high voltage) reading at the same temperature. Either voltage specification listed is correct.

ENGINE COOLANT TEMPERATURE SENSOR & INTAKE AIR TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

50 (10)

3.51

58,750

68 (20)

3.07

37,300

86 (30)

2.60

24,270

104 (40)

2.13

16,150

122 (50)

1.70

10,970

140 (60)

1.33

7600

158 (70)

1.02

5370

176 (80)

0.78

3840

194 (90)

0.60

2800

212 (100)

0.46

2070

230 (110)

0.35

1550

248 (120)

0.27

1180

⁽¹⁾	Values may differ by as much as 15 percent. For additional testing, see TEST DA under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

⁽²⁾	Measure by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

ENGINE COOLANT TEMPERATURE SENSOR & INTAKE AIR TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

50 (10)

3.51

58,750

68 (20)

3.07

37,300

86 (30)

2.60

24,270

104 (40)

2.13

16,150

122 (50)

1.70

10,970

140 (60)

1.33

7600

158 (70)

1.02

5370

176 (80)

0.78

3840

194 (90)

0.60

2800

212 (100)

0.46

2070

230 (110)

0.35

1550

248 (120)

0.27

1180

⁽¹⁾	Values may differ by as much as 15 percent. For additional testing, see TEST DA under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

⁽²⁾	Measure by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

ENGINE FUEL TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

-40 (-40)

4.54

92,500

50 (10)

3.51

58,750

68 (20)

3.07

27,300

86 (30)

2.60

24,270

104 (40)

2.13

16,150

122 (50)

1.70

10,970

140 (60)

1.33

7700

158 (70)

1.02

5370

176 (80)

0.78

3840

194 (90)

0.60

2800

212 (100)

0.46

2070

248 (120)

0.27

1180

275 (135)

0.19

810

302 (150)

0.13

560

⁽¹⁾	Values may differ by as much as 15 percent. For additional testing, see TEST DB under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

⁽²⁾	Measure by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

FUEL RAIL PRESSURE (FRP) SENSOR VOLTAGE-TO-FUEL PRESSURE CONVERSION

Volts ⁽¹⁾

Pressure (psi)

Natural Gas Vehicles

4.5

150

4.1

140

3.7

130

3.3

120

2.9

110

2.5

100

2.1

1.7

1.3

0.9

0.5

0.1

0.0

37.5

Except Natural Gas Vehicles

4.5

3.9

3.4

2.8

2.2

1.6

1.1

0.5

Zero

⁽¹⁾	For additional testing, see TEST DD under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.

THROTTLE POSITION SENSOR SPECIFICATIONS

Throttle Angle

⁽¹⁾ Volts

0°

.65

10°

.97

20°

1.44

30°

1.90

40°

2.37

50°

2.84

60°

3.31

70°

3.78

80°

3.90

⁽¹⁾	Values may vary by 15 percent. For additional testing, see TEST DH under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.