Engine Controls - Sensor Operating Range Charts: Introduction

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 may cause driveability problems.

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

BAROMETRIC PRESSURE SENSOR OUTPUT VOLTAGE ⁽¹⁾

Vacuum: In. Hg.

⁽²⁾ Volts

3.84

3.36

2.66

1.93

1.26

.58

⁽¹⁾	Measure voltage between breakout box test pins BP and SIGRTN on Capri, or between test pins BP and GND on Festiva.

⁽²⁾	Voltage may vary by plus or minus 15 percent.

ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE ⁽¹⁾

Temperature °F (°C)

Ohms

-4 (-20)

14,600-17,800

68 (20)

2200-2700

104 (40)

1000-1300

140 (60)

500-650

176 (80)

290-350

⁽¹⁾	Measure resistance between breakout box test pins ECT and SIGRTN on Capri, or between test pins ECT and GND on Festiva.

IGNITION DIAGNOSTIC MONITOR VOLTAGE ⁽¹⁾

RPM

Volts

500

1.103

1000

1.257

1500

1.542

2000

1.768

2500

2.06

3000

2.15

3500

2.26

4000

2.50

4500

2.47

5000

2.40

⁽¹⁾	Measure voltage between breakout box test pins IDM and VPWR.

THROTTLE POSITION SENSOR RESISTANCE & VOLTAGE ⁽¹⁾

Throttle Opening

⁽²⁾⁽³⁾ Ohms

⁽²⁾⁽³⁾ Volts

1/8

989

.998

1/4

1104

1.60

3/8

1278

2.37

1/2

1462

2.74

5/8

1480

3.15

3/4

1459

3.43

7/8

1144

3.60

Fully Open

1072

4.02

⁽¹⁾	Measure resistance and voltage between breakout box test pins TP and SIGRTN on Capri.

⁽²⁾	Capri only. Festiva uses throttle position switch.

⁽³⁾	Resistance and voltage may vary by plus or minus 15 percent.

VANE AIRFLOW METER VOLTAGE ⁽¹⁾

Door Opening

⁽²⁾⁽³⁾ Volts

1/8

3.24

1/4

5.60

3/8

5.62

1/2

5.83

5/8

6.02

3/4

6.57

7/8

7.46

Fully Open

7.87

⁽¹⁾	Measure voltage between breakout box test pins VAF and SIGRTN on Capri, or between test pins VAF and GND on Festiva.

⁽²⁾	Capri only. On Festiva, voltage should vary smoothly from .5-1.5 volts with door fully open, to 4.5-5 volts with door fully closed.

⁽³⁾	Voltage may vary by plus or minus 15 percent.

VANE AIR TEMPERATURE RESISTANCE ⁽¹⁾

Temperature °F (°C)

⁽²⁾ Ohms

-4 (-20)

15,000

32 (0)

5200

68 (20)

2500

104 (40)

1100

140 (60)

600

176 (80)

300

⁽¹⁾	Measure resistance between breakout box test pins VAT and SIGRTN on Capri, or between test pins VAT and GND on Festiva.

⁽²⁾	Resistance may vary by plus or minus 15 percent