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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.
CLOSED THROTTLE POSITION (CTP) SWITCH RESISTANCE

Terminals Ohms @ Closed Throttle Ohms @ Slightly Open Throttle
4 & 6 0 Infinite
CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE

Terminals No. Ohms
1 & 2 1000
1 & 3 0
2 & 3 0
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature Ohms
68°F (20°C) About 2500
176°F (80°C) About 330
INTAKE MANIFOLD CHANGE-OVER (IMCO) VALVE SWITCH RESISTANCE

Terminals No. Ohms
1 & 2 25-35
MASS AIRFLOW (MAF) SENSOR TEST

Condition (1) Volts
Key On Engine Off About 0.3-1.1
Engine Running (2) About 1.5-3.4
(1) Backprobe connector terminals No. 1 and 2.
(2) Vary engine speed between idle and 4000 RPM.
OXYGEN SENSOR (O2S) VOLTAGE

Condition (1) Volts
Lean About 0.2
Rich About 0.7
(1) Measured between connector terminal and ground.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Terminals Ohms @ Idle Ohms @ Wide Open Throttle
1 & 2 1500-2600 N/A
2 & 3 750-1300 3600