Sensor Operating Range Charts

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 (ECT) 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 TEMP (IAT) 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 ECM terminals. See WIRING DIAGRAMS article in ENGINE PERFORMANCE Section.

EGR LIFT SENSOR VOLTAGE TEST ⁽¹⁾

Position

Volts (Approximate)

Fully Closed

1.2

Fully Open

4.3

⁽¹⁾	Measure voltage at appropriate ECM terminals. See WIRING DIAGRAMS article in 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 oxygen 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 (VSS) TEST ⁽¹⁾

Application

⁽²⁾ Voltage

Prelude

Except H22A1 Engine

H22A1 Engine

⁽¹⁾	Backprobe terminals at sensor.

⁽²⁾	Voltage will fluctuate between zero and specified value.