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 sensor terminals.

MASS AIRFLOW (MAF) SENSOR RESISTANCE

Measure Between Terminals

Resistance

No. 1 (Blue/Green) ⁽¹⁾ & No. 3 (Black/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/Yellow) & No. 5 (Black/Red)

MAF Closed

200-600

MAF Open

20-1200

No. 4 (Light Green/Red) & No. 5 (Black/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 Blue/White wire at O2S sensor with engine running and at normal operating temperature.

TP SENSOR CONTINUITY SPECIFICATIONS (A/T)

Test Condition ⁽¹⁾

Check Between Pin Nos. ⁽²⁾

Continuity?

.004" (.1 mm)

1 & 2

Yes

.024" (.6 mm)

1 & 2

⁽¹⁾	Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.

⁽²⁾	For information on connector terminal identification and test conditions, see ADJUSTMENTS article.

TP SENSOR CONTINUITY SPECIFICATIONS (M/T)

Test Condition ⁽¹⁾

Continuity Between IDL & E? ⁽²⁾

Continuity Between POW & E?

.004" (.1 mm)

Yes

.039" (1.0 mm)

Wide Open Throttle

Yes

⁽¹⁾	Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.

⁽²⁾	For information on connector terminal identification and test conditions, see ADJUSTMENTS article.