Sensor Operating Range Charts

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum10-megohm input impedance.

COOLANT TEMPERATURE (TW) 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.

DISTRIBUTOR SENSOR RESISTANCE ⁽¹⁾

Application

Ohms

CRANK Sensor

650-850

CYL Sensor

650-850

TDC Sensor

650-850

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

EGR POSITION SENSOR VOLTAGE ⁽¹⁾

Position

Approximate Volts

Fully Closed

1.0

Fully Open

4.5

⁽¹⁾	Measure voltage between terminals D12 (positive) and D22 (negative). Voltage should increase smoothly as vacuum is applied.

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 D17 (positive) and D21 (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 SENSOR VOLTAGE ⁽¹⁾

Position

Approximate Volts

Fully Closed

0.1-0.5

Fully Open

4.5-4.8

⁽¹⁾	Voltage should increase smoothly as throttle is opened.

VEHICLE SPEED SENSOR VOLTAGE ⁽¹⁾

Model

Approximate Volts

Vigor

⁽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.