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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 diagnostic trouble code, but it may cause driveability problems.

NOTE: Unless stated otherwise in test procedure, perform all resistance and voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
CLOSED THROTTLE POSITION (CTP) SWITCH RESISTANCE

Terminals No. Ohms Closed Throttle Ohms Slightly Open Throttle
4 & 6 0 Infinite (Open)
CRANKSHAFT POSITION (CKP) SENSOR RESISTANCE

Terminals No. Ohms
1 & 2 Approx. 1000
1 & 3 Infinite (Open)
2 & 3 Infinite (Open)
EGR TEMPERATURE SENSOR RESISTANCE TEST

Temperature °F (°C) Ohms
122 (50) 500,000-600,000
257 (125) 35,000-40,000
392 (200) 4500-6500
ECT SENSOR RESISTANCE

Temperature °F (°C) Ohms
86 (30) 1500-2000
104 (40) 1000-1500
122 (50) 800-1000
140 (60) 500-700
158 (70) 375-500
176 (80) 275-375
194 (90) 225-275
ENGINE SPEED (RPM) SENSOR RESISTANCE

Terminals No. Ohms
1 & 2 Approx. 1
1 & 3 Infinite (Open)
2 & 3 Infinite (Open)
HEATED OXYGEN SENSOR (HO2S) VOLTAGE

Condition (1) Volts
Lean Approx. 0.2
Rich Approx. 0.7
(1) Measured between connector terminal and ground.
INTAKE AIR (IAT) SENSOR RESISTANCE

Temperature °F (°C) Ohms
86 (30) 1500-2000
104 (40) 1000-1500
122 (50) 800-1000
140 (60) 500-700
158 (70) 375-500
176 (80) 275-375
194 (90) 225-275
MASS AIRFLOW (MAF) SENSOR TEST

Condition (1) Volts
Key On Engine Off About 0.3-1.1
Engine Running (2) 1.5 Minimum-3.4 Maximum
(1) Backprobe connector terminals No. 1 and 2.
(2) Continuously vary engine speed between idle and 4000 RPM.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Terminals No. Ohms At Idle Ohms Wide Open Throttle
1 & 2 1500-2600 N/A
2 & 3 750-1300 (1) 3600 Maximum
(1) Resistance should gradually increase as throttle is opened.