Sensor Operating Range Charts

NOTE: For connector and terminal identification see WIRING DIAGRAMS article.

AIRFLOW METER VOLTAGE TEST ⁽¹⁾

Condition

Volts

700-3000 RPM

2.7-3.2

⁽¹⁾	Measure voltage between terminals No. 3 and 6 of airflow sensor connector.

BAROMETRIC PRESSURE SENSOR VOLTAGE TEST ⁽¹⁾

psi (kg/cm² )

Volts

2.9 (20)

0.79

6.9 (49)

1.84

15 (103)

4.0

⁽¹⁾	Measure voltage between terminals No. 5 and 6 of barometric pressure sensor connector.

COOLANT TEMPERATURE SENSOR RESISTANCE TEST ⁽¹⁾

Temperature °F (°C)

Ohms

32 (0)

5900

68 (20)

2500

104 (40)

1100

176 (80)

300

⁽¹⁾	Measure resistance across disconnected sensor terminals.

INTAKE AIR TEMP SENSOR RESISTANCE ⁽¹⁾

Temperature °F (°C)

Ohms

32 (0)

6600-5400

68 (20)

2970-2300

176 (80)

310-430

⁽¹⁾	Measure resistance between terminals No. 4 and 6 of airflow sensor connector.

MOTOR POSITION SENSOR RESISTANCE TEST ⁽¹⁾

Condition

Ohms

Connector Unplugged

4000-6000

Apply 6 volts ⁽²⁾

Resistance Changes Smoothly

⁽¹⁾	Measure resistance between terminals No. 2 and 3 of motor position sensor connector.

⁽²⁾	Apply 6 volts between terminals No. 1 and 2. Check resistance between terminals No. 3 and 5.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾⁽²⁾

Condition

Volts

Lean

0.1

Rich

1.0

⁽¹⁾	Measure between sensor terminal No. 1 and ground or between terminals No. 1 and 2.

⁽²⁾	Test at normal operating temperature.

THROTTLE POSITION SENSOR (TPS) RESISTANCE TEST

Position

Terminal ⁽¹⁾ (Ground-Output)

Ohms

Closed

1-3

3500-6500

Open

1-2

500-(3500-6500)

⁽¹⁾	Measure across TPS terminals with connector removed.

VEHICLE SPEED SENSOR VOLTAGE TEST ⁽¹⁾⁽²⁾

Reed Switch

Volts

1 or Less

Off

⁽¹⁾	Measure voltage at back of speedometer. See WIRING DIAGRAMS article.

⁽²⁾	Roll vehicle to cycle reed switch on and off.