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.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE ⁽¹⁾

Temperature - °F (°C)

Ohms

176 (80)

317-325

68 (20)

2200-2700

-4 (-20)

14,600-17,800

⁽¹⁾	Measure resistance between terminals of sensor.

MASS AIRFLOW (MAF) SENSOR RESISTANCE

Measure Between Terminals

Resistance

No. 1 (BLU/GRN) & No. 3 (BLK/RED) ⁽¹⁾

140°F (60°C)

493-667

68°F (20°C)

2210-2690

-4°F (-20°C)

13,600-18,400

No. 2 (RED/YEL) & No. 5 (BLK/RED)

MAF Closed

200-600

MAF Open

20-1200

No. 4 (LT GRN/YEL) & No. 5 (BLK/RED)
200-400

⁽¹⁾	Intake air temperature sensor terminals.

OXYGEN SENSOR VOLTAGE ⁽¹⁾

Condition

Volts

Increase Engine Speed

.5-1.0

Decrease Engine Speed

0-.4

⁽¹⁾	Measure voltage between ground and O2S sensor terminal with engine running and at normal operating temperature.

THROTTLE POSITION (TP) SENSOR RESISTANCE ⁽¹⁾

Application

Ohms

Closed Throttle

Less Than 1000

Full Throttle

About 5000

⁽¹⁾	Measure resistance between terminals No. 3 (Light Green/Orange wire) and No. 1 (Black/Red wire) of TP sensor connector.