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.

NOTE: See TESTS W/CODES article or SYSTEM/COMPONENT TESTS article for additional sensor testing procedures.

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

CRANKSHAFT POSITION SENSOR (CKP) VOLTAGE

Application

⁽¹⁾ Volts

SLX

2.5

⁽¹⁾	Measure voltage between signal circuit and ground while cranking engine.

ECT & IAT SENSOR RESISTANCE

Temperature °F (°C)

⁽¹⁾ Ohms

-40 (-40)

100,700

-22 (-30)

52,700

5 (-15)

21,450

23 (-5)

12,300

41 (5)

7280

59 (15)

4450

77 (25)

2796

95 (35)

1802

113 (45)

1188

140 (60)

667

176 (80)

332

212 (100)

177

⁽¹⁾	Measure resistance across disconnected sensor terminals.

OXYGEN SENSOR VOLTAGE ⁽¹⁾

Condition

Volts

Lean

0.1

Rich

1.0

⁽¹⁾	Test at normal operating temperature.

OXYGEN SENSOR HEATING ELEMENT RESISTANCE ⁽¹⁾

Application

⁽²⁾ Ohms

SLX

3-6

⁽¹⁾	Resistance will vary with temperature change.

⁽²⁾	See WIRING DIAGRAMS section for heater circuit identification.

THROTTLE POSITION SENSOR VOLTAGE ⁽¹⁾

Position

⁽²⁾ Volts

Closed Throttle

0.22

Open Throttle

4.88

⁽¹⁾	For terminal locations, see WIRING DIAGRAMS section.

⁽²⁾	Voltage should increase smoothly from closed to wide open throttle.

VEHICLE SPEED SENSOR VOLTAGE ⁽¹⁾

Application

⁽²⁾ Volts

SLX

Toggles between 0.6 & 10

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

⁽²⁾	With ignition on, turn speedometer cable to cycle reed switch on and off.