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

ECT SENSOR RESISTANCE

Temperature	Ohms
-4°F (-20°C)	14,600-17,800
68°F (20°C)	2200-2700
104°F (40°C)	1000-1300
140°F (60°C)	500-650
176°F (80°C)	290-350

FUEL TEMPERATURE SENSOR RESISTANCE

Temperature	Ohms
68°F (20°C)	2200-2700
176°F (80°C)	290-350

INTAKE AIR THERMOSENSOR RESISTANCE

Application	Ohms
68°F (20°C)	2200-2700
176°F (80°C)	290-350

MANIFOLD ABSOLUTE PRESSURE SENSOR

Application

(1) Voltage

Engine At Idle

1.3-1.6

MAP Sensor Hose Disconnect & Plugged

2.38-2.78

29 in. Hg Applied To Map Sensor⁽¹⁾

4.35-4.65

⁽¹⁾	Positive lead of voltmeter to MAP sensor terminal "A" and negative lead to terminal "B".

OXYGEN SENSOR

Operating Condition	Voltage
Rapidly Accelerating	0.5-1.0
Deceleration	0.0-0.4

TP SENSOR VOLTAGE

Wire Color To Ground⁽¹⁾

Closed Throttle Volts

WOT Volts

Grn/Red (3F)

.75-1.25

4.8-5.0

Blk/Green (3G)

0.7-1.0

4.2-4.6

⁽¹⁾	PCM terminal pin No. in parentheses.