Engine Control System - Sensor 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 will cause driveability problems.

NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.

ECT ⁽¹⁾, DFT ⁽²⁾ & IAT ⁽³⁾ SENSOR RESISTANCE VALUES ⁽⁴⁾

°F (°C)

Ohms

266 (130)

212 (100)

177

194 (90)

241

176 (80)

332

158 (70)

467

140 (60)

667

122 (50)

973

113 (45)

1188

104 (40)

1459

95 (35)

1802

86 (30)

2238

77 (25)

2796

68 (20)

3520

59 (15)

4450

50 (10)

5670

41 (5)

7280

32 (0)

9420

23 (-5)

12,300

14 (-10)

16,180

5 (-15)

21,450

-4 (-20)

28,680

-22 (-30)

52,700

-22 (-30)

52,700

-40 (-40)

100,700

⁽¹⁾	(ECT) Engine Coolant Temperature.

⁽²⁾	(DFT) Diesel Fuel Temperature.

⁽³⁾	(IAT) Intake Air Temperature.

⁽⁴⁾	Measure resistance across sensor terminals.

MAP SENSOR VOLTAGE RANGE ⁽¹⁾

Throttle Position

Volts

At Idle

1.0-1.5

Wide Open Throttle

4.0-4.6

⁽¹⁾	Measured at sensor, or as seen on scan tester. Ensure sensor output changes instantly when intake manifold vacuum is applied and released.

OXYGEN SENSOR VOLTAGE TEST ⁽¹⁾

Condition

Volts

Lean

Rich

⁽¹⁾	Measure voltage between oxygen sensor ground and signal terminals at PCM.