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

COOLANT TEMP 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.

EGR TEMP SENSOR RESISTANCE TEST ⁽¹⁾⁽²⁾

Temperature °F (°C)

K Ohms

122 (50)

60-83

212 (100)

11-14

⁽¹⁾	Measure resistance across disconnected sensor terminals.

⁽²⁾	Specifications apply to all models except Eclipse, Galant and Montero.

INTAKE AIR TEMP SENSOR RESISTANCE ⁽¹⁾

Temperature °F (°C)

Ohms

32 (0)

6000

68 (20)

2700

176 (80)

400

⁽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.

OXYGEN SENSOR RESISTANCE TEST ⁽¹⁾⁽²⁾

Temperature °F (°C)

Ohms

68 (20)

752 (400)

30 or more

⁽¹⁾	Measure between sensor terminals No. 3 and 4.

⁽²⁾	Information on other models not available from manufacturer.

THROTTLE POSITION SENSOR (TPS) RESISTANCE TEST

Position

Terminal ⁽¹⁾ (Ground-Output)

Ohms

Closed

⁽²⁾ 1-4

3500-6500

Open

⁽¹⁾⁽³⁾

3500-6500

⁽¹⁾	Measure across TPS terminals with connector removed.

⁽²⁾	On Colt Vista, use terminals No. 1 and 2. On Sigma, use terminals No. 2 and 3.

⁽³⁾	Resistance should increase smoothly.

VEHICLE SPEED SENSOR CONTINUITY TEST ⁽¹⁾⁽²⁾

Reed Switch

Condition

Colt Vista, Galant & Van/Wagon

4 Changes in Continuity

One Revolution

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

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

VEHICLE SPEED SENSOR VOLTAGE TEST ⁽¹⁾⁽²⁾

Reed Switch

Volts

1 or Less

Off

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

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

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Sensor Operating Range Charts

Use the Manual With the Right Hardware

When to See a Mechanic

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