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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.
AIRFLOW MTR TERM RESISTANCE

Terminals (1) Fully Closed: Ohms Fully Open: Ohms
E2 & Vs (2) 200-600 20-1000
E2 & Vc 200-400 200-400
E2 & THAa (3)
-4°F (-20°C) 13,600-18,400 13,600-18,400
68°F (20°C) 2210-2690 2100-2690
140°F (60°C) 493-667 493-667
E1 & Fc Infinite 0
(1) See appropriate I - SYS/COMP TESTS article in the ENGINE PERFORMANCE section for terminal identification.
(2) 20-600 ohms on 323 and Protege.
(3) Intake air thermosensor.
AIRFLOW MTR TERM RESISTANCE

Terminals (1) Temperature Ohms
E2 & Vs
Closed 68°F (20°C) 20-600
Open 68°F (20°C) 20-1000
E2 & Vc (2) 68°F (20°C) 200-400
E2 & THA (3) -4°F (-20°C) 10,000-20,000
68°F (20°C) 2000-3000
140°F (60°C) 400-700
(1) See appropriate I - SYS/COMP TESTS article in the ENGINE PERFORMANCE section for terminal identification.
(2) Measurement is from closed to open.
(3) Intake air thermosensor.
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
EGR POSITION SENSOR RESISTANCE

Terminals Ohms
MX-3 DOHC
"A" & "B"
Zero in. Hg 2300
6 in. Hg 5800
"A" & "C"
Zero in. Hg 5300
6 in. Hg 1200
"B" & "C" 5000
MX-6 2.5L & 626 2.5L
"A" & "B" 5000
"A" & "C" 700-5000
"B" & "C" 700-5000
OXYGEN SENSOR

Operating Condition Voltage
Rapidly Accelerating 0.5-1.0
Deceleration 0.0-0.4
TP SENS CONTINUITY (MX-3 - 1.6L A/T & 1.8L, PROTEGE A/T, 323 A/T)

Test Condition (1) (2) Continuity
MX-3 1.8L
.006" (.15 mm) Yes
.020" (.50 mm) No
All Others
.004" (.10 mm) Yes
.024" (.60 mm) No
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.
(2) Check continuity with ohmmeter connected between TP sensor terminals "E" and IDL.
TP SENSOR CONTINUITY

Test Condition Continuity Between IDL & TL/E Continuity Between POW & TL/E
.004" (.10 mm) (1) Yes No
.039" (1.0 mm) (1) No No
WOT No Yes
(1) Insert feeler gauge of specified thickness between throttle lever and throttle stop screw.