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 drive ability problems.

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

COOLANT TEMPERATURE (ACT) 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 (NAT) 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 ACM terminals. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.

ERG LIFT SENSOR VOLTAGE TEST ⁽¹⁾

Position

Volts (Approximate)

Fully Closed

1.2

Fully Open

4.3

⁽¹⁾

Measure voltage at appropriate ACM terminals. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Less Than 0.4

Rich

Greater Than 0.6

⁽¹⁾

Measure voltage between ground and oxygen sensor terminal using a high-impedance DOOM.

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 ⁽¹⁾

Application

Volts

Accord

⁽²⁾ 0-12

Civic & Civic Del Sol

⁽²⁾ 0-5

Prelude

F22A1 & H23A1 Engines

⁽²⁾ 0-5

H22A1 Engine

⁽²⁾ 0-12

⁽¹⁾

Back Probe terminals at sensor.

⁽²⁾

Pulses between specification limits with sensor turning.