Engine Controls - Sensor Operating Range Charts: Introduction

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. Not all vehicles have all sensors listed.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.

MASS AIRFLOW (MAF) SENSOR RESISTANCE TEST ⁽¹⁾

Conditions

Ohms

Sensor At Rest ⁽²⁾

4500-5500

Sensor At Rest ⁽³⁾

3800-4200

⁽¹⁾	Using Breakout Box (VAG 1598).

⁽²⁾	Measure resistance between terminals No. 23 and 26.

⁽³⁾	Measure resistance between terminals No. 26 and 35.

ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE TEST

Temperature °F (°C)	Ohms
68 (20)	3000-2000
86 (30)	2000-1500
104 (40)	1500-1000
122 (50)	1000-800
140 (60)	700-500
158 (70)	500-375
176 (80)	375-275
194 (90)	275-225

EGR TEMPERATURE SENSOR RESISTANCE TEST

Temperature °F (°C)	Ohms
122 (50)	500,000-600,000
257 (125)	35,000-40,000
392 (200)	4500-6500

ENGINE SPEED SENSOR

Application	Ohms
Engine Speed Sensor	500-700

OXYGEN SENSOR RESISTANCE TEST ⁽¹⁾⁽²⁾

Condition

Ohms

Disconnect & Ground Harness Wire

1.5

Reconnect Sensor

Open Circuit

⁽¹⁾	Using Breakout Box (VAG 1598).

⁽²⁾	Measure resistance between terminals No. 2 and 8.

THROTTLE POSITION SENSOR RESISTANCE TEST ⁽¹⁾⁽²⁾

Position

Ohms

Throttle Closed

0.5

Off Full Throttle

Open Circuit

Full Throttle

0.5

⁽¹⁾	Using Breakout Box (VAG 1598).

⁽²⁾	Measure resistance between terminals No. 6 and 11.

VACUUM SENSOR RESISTANCE TEST ⁽¹⁾

Condition

Ohms

Move Sensor Plate

Changing

⁽¹⁾	Using Breakout Box (VAG 1598), measure resistance between terminals No. 15 and 19.