1994 Mazda 626 ES, StandardFACTORY OEM SERVICE PROCEDURE

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.
AIR CHARGE TEMPERATURE (ACT) SENSOR RESISTANCE

Temperature Ohms
77°F (25°C) 29,000-36,300
185°F (85°C) 3300-3700
AIRFLOW SENSOR TERMINAL VOLTAGES

Terminal Wire Color Ignition On: Volts Engine Running: Volts
Red/Black (Power Supply) 12.0 12.0
Black/Blue (Airflow Mass)
M/T 1.0-1.5 1.5-5.0
A/T 0 0.6-0.7
Black/Green (Ground) 0 0
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
"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 SENSOR CONTINUITY

Test Condition (1) (2) Continuity
.006" (.15 mm) Yes
.020" (.50 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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.