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.

COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C)	Ohms
0 (-18)	14,650
20 (-7)	8100
40 (4)	4780
70 (21)	2350
100 (38)	1250
160 (71)	400
210 (99)	190

IAT SENSOR RESISTANCE

Temperature °F (°C)	Ohms
0 (-18)	14,650
20 (-7)	8100
40 (4)	4780
70 (20)	2350
100 (38)	1250
160 (71)	400
210 (99)	190

THROTTLE POSITION SENSOR (TPS) RESISTANCE (A/T)

Condition

Resistance (Ohms)

Between Terminals A & B ⁽¹⁾

Continuity

Between Terminals A & B ⁽²⁾

No Continuity

Between Terminals A & B ⁽³⁾

Continuity

Between Terminals A & D ⁽³⁾

4370-8130

Between Terminals A & C ⁽³⁾

240-1140

Between Terminals A & C ⁽⁴⁾

3170-6600

⁽¹⁾	With .012" (.30 mm) feeler gauge installed between stop screw and lever.

⁽²⁾	With .035" (.89 mm) feeler gauge installed between stop screw and lever.

⁽³⁾	Throttle valve at idle position.

⁽⁴⁾	Throttle valve at fully open position.

Fig 1: Identifying Throttle Position Sensor Terminals

Courtesy of GENERAL MOTORS CORP.

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

Engine Controls - Sensor Operating Range Charts: Introduction: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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