Engine Controls - Sensor Operating Range Charts: Introduction

NOTE: For sensor information on 6.0L or 7.3L diesel, see SELF-DIAGNOSTICS - 6.0L DIESEL or SELF-DIAGNOSTICS - 7.3L 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.

AIR CONDITIONING EVAPORATOR TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature - °F (°C)

⁽²⁾ Volts

⁽³⁾ Ohms

-4 (-20)

4.66

276,960

14 (-10)

4.45

160,310

32 (0)

4.14

95,850

50 (10)

3.73

58,990

68 (20)

3.26

37,340

86 (30)

2.74

24,250

104 (40)

2.23

16,110

122 (50)

1.77

10,930

140 (60)

1.37

7550

158 (70)

1.05

5340

176 (80)

0.80

3840

194 (90)

0.61

2800

212 (100)

0.47

2080

⁽¹⁾	Values may differ by as much as 15 percent. For additional testing, see TEST DJ: AIR CONDITIONING EVAPORATOR TEMPERATURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

⁽²⁾	Measure voltage by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

Fig 1: Accelerator Pedal Position Sensor Voltage

Courtesy of FORD MOTOR CO.

BARO SENSOR SPECIFICATIONS ⁽¹⁾

In. Hg

kPa

Volts

Altitude (Ft.)

3.5

11.8

0.15

N/A

16.9

0.40

N/A

33.8

1.25

N/A

50.7

2.10

14,000

67.5

2.90

10,000

70.9

3.10

9000

74.3

3.30

8000

77.7

3.50

7000

81.1

3.62

6000

84.4

3.80

5000

87.8

4.00

4000

91.2

4.14

3000

94.6

4.30

2000

97.9

4.50

1000

⁽¹⁾	Using scan tool, select BARO PID from PID/DATA monitor menu. BARO PID should be within 2 in. Hg (6 Hz) of altitude value. For additional testing, see TEST DQ: BAROMETRIC PRESSURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

CYLINDER HEAD TEMPERATURE SENSOR SPECIFICATIONS ⁽¹⁾

Temperature - °F (°C)

Cold End Volts

Hot End Volts

⁽²⁾ Ohms

-40 (-40)

4.89

N/A

965,808

-22 (-30)

4.81

N/A

513,019

-4 (-20)

4.67

N/A

283,664

14 (-10)

4.45

N/A

162,584

32 (0)

4.14

N/A

96,255

50 (10)

3.73

N/A

59,175

68 (20)

3.26

N/A

37,387

86 (30)

2.74

N/A

24,215

104 (40)

2.23

N/A

16,043

122 (50)

1.76

N/A

10,850

140 (60)

1.36

N/A

7487

158 (70)

1.04

N/A

5268

176 (80) ⁽³⁾

.79

3.99

3775

185 (85) ⁽³⁾

.69

3.86

3215

194 (90) ⁽³⁾

.60

3.71

2750

203 (95) ⁽³⁾

.53

3.56

2361

212 (100) ⁽³⁾

.46

3.41

2034

230 (110)

N/A

3.07

1523

248 (120)

N/A

2.74

1155

266 (130)

N/A

2.41

887

284 (140)

N/A

2.10

689

302 (150)

N/A

1.81

542

320 (160)

N/A

1.55

430

338 (170)

N/A

1.33

345

356 (180)

N/A

1.13

279

374 (190)

N/A

.96

228

392 (200)

N/A

.82

188

410 (210)

N/A

.70

155

428 (220)

N/A

.60

130

446 (230)

N/A

.51

109

464 (240)

N/A

.44

482 (250)

N/A

.35

500 (260)

N/A

.33

⁽¹⁾	Value may vary by 15 percent. For additional testing, see TEST DL: CYLINDER HEAD TEMPERATURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

⁽²⁾	Measure resistance between cylinder head temperature 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.

NOTE: Two different types of internal temperature circuits are used by the PCM. One circuit has a pull-down resistor to SIG RTN and the other does not have a pull-down resistor. To determine if an internal PCM pull-down resistor is used, disconnect the temperature sensor and measure voltage between temperature sensor signal (ECT, IAT or EOT) at sensor harness connector and ground with the key on. If voltage is 5.0 volts, no resistor is used.

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

Temperature - °F (°C)

⁽²⁾⁽³⁾ Volts

⁽²⁾⁽⁴⁾ Volts

⁽⁵⁾ Ohms

14 (-10)

4.45

4.15

160,310

32 (0)

4.14

3.91

95,850

50 (10)

3.73

3.51

58,750

68 (20)

3.26

3.07

37,300

86 (30)

2.74

2.60

24,270

104 (40)

2.23

2.13

16,150

122 (50)

1.77

1.70

10,970

140 (60)

1.37

1.33

7600

158 (70)

1.05

1.02

5370

176 (80)

0.80

0.78

3840

194 (90)

0.61

0.60

2800

212 (100)

0.47

0.46

2070

230 (110)

0.36

0.35

1550

248 (120)

0.28

0.27

1180

⁽¹⁾	Values may differ by as much as 15 percent. For additional testing, see TEST DA: TEMPERATURE SENSOR TEST (IAT, ECT & EOT) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

⁽²⁾	Measure voltage by backprobing signal circuit to ground.

⁽³⁾	With out resistor.

⁽⁴⁾	With resistor.

⁽⁵⁾	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

230 (110)

0.35

1550

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: ENGINE FUEL TEMPERATURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

⁽²⁾	Measure by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

FUEL RAIL PRESSURE SENSOR VOLTAGE-TO-FUEL PRESSURE CONVERSION

Volts ⁽¹⁾

Pressure - psi (kPa)

Natural Gas Vehicles

4.5

150 (1034)

4.1

140 (965)

3.7

130 (896)

3.3

120 (827)

2.9

110 (758)

2.5

100 (689)

2.1

90 (620)

1.7

80 (551)

1.3

70 (482)

0.9

60 (413)

0.5

50 (344)

0.1

40 (275)

0.0

37.6 (259)

Except Natural Gas Vehicles

4.5

70 (482)

3.9

60 (413)

3.4

50 (344)

2.8

40 (275)

2.2

30 (207)

1.6

20 (138)

1.1

10 (69)

0.5

0.0 (0.0)

⁽¹⁾	For additional testing, see TEST DD: FUEL RAIL PRESSURE SENSOR under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

INTAKE AIR TEMPERATURE 2 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 DU: INTAKE AIR TEMPERATURE 2 under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

⁽²⁾	Measure voltage by backprobing signal circuit to ground.

⁽³⁾	Measure resistance between sensor terminals.

MASS AIRFLOW SENSOR BAROMETRIC PRESSURE REFERENCE CHART

Barometric Pressure - In. Hg (kPa)	BARO/MAP PID (Hz)	Altitude
3.5 (11.8)	89.3	N/A
5.0 (16.9)	92.8	N/A
10.0 (33.8)	104.6	N/A
15.0 (50.7)	117.0	14,000
20.0 (67.5)	129.6	10,000
21.0 (70.90	132.5	9000
22.0 (74.3)	135.4	8000
23.0 (77.7)	138.3	7000
24.0 (81.1)	141.1	6000
25.0 (84.4)	144.0	5000
26.0 (87.8)	146.9	4000
27.0 (91.2)	149.8	3000
28.0 (94.6)	152.8	2000
29.0 (97.9)	155.8	1000
30.0 (101.3)	158.9	0 (Sea Level)
31.0 (104.7)	162.0	N/A
31.875 (107.70	164.7	N/A

Fig 2: Throttle Position Sensor Voltage

Courtesy of FORD MOTOR CO.