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.

COOLANT TEMP (TW) SENSOR RESISTANCE TEST ⁽¹⁾

Temperature °F (°C)

Resistance (Ohms)

-4 (-20)

15,000-18,000

68 (20)

2000-4000

176 (80)

Integra

200-400

Legend

300-400

⁽¹⁾	Measure resistance across sensor terminals.

DISTRIBUTOR SENSORS RESISTANCE TEST ⁽¹⁾

Application

Resistance (Ohms)

Integra

CRANK Sensor

350-700

CYL Sensor

350-700

TDC Sensor

350-700

Legend

CRANK Sensor

600-950

CYL Sensor

600-950

⁽¹⁾	See appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE Section to identify sensor terminals.

EGR LIFT SENSOR VOLTAGE TEST ⁽¹⁾

Position

Approximate Volts

Fully Closed

1.0

Fully Open

4.5

⁽¹⁾	On Integra, measure voltage between terminals C8 (positive) and C12 (negative). On Legend, measure voltage between terminals D12 (positive) and D22 (negative). Voltage should increase smoothly as vacuum is applied.

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

Temperature °F (°C)

Resistance (Ohms)

-4 (-20)

15,000-18,000

68 (20)

2000-4000

176 (80)

Integra

200-400

Legend

300-400

⁽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⁾	On Integra, measure voltage between ECU terminals C11 (positive) and C12 (negative). On Legend, measure voltage between ECU terminals D17 (positive) and D21 (negative)

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Rich

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

THROTTLE ANGLE SENSOR VOLTAGE TEST ⁽¹⁾

Position

Approximate Volts

Fully Closed

.1-.5

Fully Open

4.5-4.8

⁽¹⁾	On Integra, measure resistance between terminals C7 (positive) and C12 (negative). On Legend, measure resistance between terminals D11 (positive) and D22 (negative). Voltage should increase smoothly as throttle is opened.