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.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature - °F (°C)

⁽¹⁾ Ohms

-4 (-20)

15,000-18,000

68 (20)

1000-4000

176 (80)

200-400

248 (120)

50-150

⁽¹⁾	Measure resistance across sensor terminals.

IGNITION SENSOR RESISTANCE

Application	ECM Terminals	Ohms
CRANK	B15 & B16	350-700
CYL	B11 & B12	350-700
TDC	B13 & B14	350-700

INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Ohms

-4 (-20)

15,000-18,000

68 (20)

2000-4000

176 (80)

300-400

⁽¹⁾	Measure resistance between sensor terminals.

MAP SENSOR VOLTAGE ⁽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 between ECU terminals C11 (positive) and C12 (negative).

OXYGEN SENSOR VOLTAGE ⁽¹⁾

Condition

Volts

Lean

Rich

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

THROTTLE POSITION (TP) SENSOR VOLTAGE ⁽¹⁾

Position

Approximate Volts

Fully Closed

0.1-0.5

Fully Open

4.5-4.8

⁽¹⁾	Measure resistance between terminals D11 (positive) and D22 (negative). Voltage should increase smoothly as throttle is opened.

VEHICLE SPEED SENSOR (VSS) VOLTAGE ⁽¹⁾

Model

Approximate Volts

Integra

⁽²⁾

⁽¹⁾	Measure voltage between terminals B10 (positive) and A26 (negative).

⁽²⁾	Rotate left front wheel slowly. Voltage should pulse between zero and 10 volts.