Sensor Range Charts: Introduction

Sensor operating range information is supplied so that it can be determined if a sensor is out of calibration. A sensor that is out of calibration may not set a trouble code, however, it will cause driveability problems.

ATMOSPHERIC PRESSURE (PA) SENSOR VOLTAGE TEST ⁽¹⁾

BARO Pressure (In. Hg)

Volts

2.8-3.0

2.3-2.5

1.8-2.0

1.3-1.5

.8-1.0

.3-.5

⁽¹⁾	Measure voltage at appropriate ECU terminals. See appropriate wiring diagram in WIRING DIAGRAMS article.

COOLANT TEMPERATURE (TW) SENSOR RESISTANCE TEST ⁽¹⁾

Temperature - °F (°C)

Resistance (Ohms)

-4 (-20)

15,000-18,000

68 (20)

1000-4000

176 (80)

200-400

⁽¹⁾	Measure resistance across sensor terminals.

INTAKE AIR TEMPERATURE (TA) SENSOR RESISTANCE TEST ⁽¹⁾

Temperature - °F (°C)

Resistance (Ohms)

-4 (-20)

15,000-18,000

68 (20)

1000-4000

176 (80)

200-400

⁽¹⁾	Measure resistance across sensor terminals.

MAP SENSOR VOLTAGE TEST ⁽¹⁾

Vacuum Applied (In. Hg.)

Volts

2.8-3.0

2.3-2.5

1.8-2.0

1.3-1.5

.8-1.0

.3-.5

⁽¹⁾	Measure voltage at appropriate ECU terminals. See appropriate wiring diagram in WIRING DIAGRAMS article.

EGR LIFT SENSOR VOLTAGE TEST ⁽¹⁾

Position

Volts (Approx.)

Fully Closed

1.0

Fully Open

4.5

⁽¹⁾	Measure voltage at appropriate ECU terminals. See appropriate wiring diagram in WIRING DIAGRAMS article. Voltage should increase smoothly as vacuum is applied.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Rich

⁽¹⁾	Measure voltage between ground and O2 sensor terminal using a high-impedance DVOM.