Engine Controls - Sensor Operating Range Charts: Introduction: Notes

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.