Engine Controls - Sensor Operating Range Charts: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. Although an out-of-calibration sensor may not set a trouble code, 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.

COOLANT TEMPERATURE (TW) SENSOR RESISTANCE TEST ⁽¹⁾

Temperature - °F (°C)

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)

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 WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.

EGR LIFT SENSOR VOLTAGE TEST ⁽¹⁾

Position

Volts (Approximate)

Accord & Prelude

Fully Closed

1.2

Fully Open

4.0

Civic

Fully Closed

1.0

Fully Open

N/A

⁽¹⁾	Measure voltage at appropriate ECU terminals. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Voltage should increase smoothly as vacuum is applied.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Less Than 0.4

Rich

Greater Than 0.6

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

THROTTLE ANGLE (POSITION) SENSOR SPECIFICATIONS

Condition

⁽¹⁾ Volts

Throttle Valve

Fully Closed

Wide Open

4.5

⁽¹⁾	Voltage change from fully closed to wide open should be smooth.

VEHICLE SPEED SENSOR VOLTAGE TEST

Application

Volts

All Models ⁽¹⁾

⁽²⁾ 0-5

⁽¹⁾	Backprobe terminals at sensor.

⁽²⁾	Pulses between 0 and 5 volts with sensor turning.