1994 Mazda MPV LXFACTORY 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.
AIRFLOW SENSOR TERMINAL VOLTAGES

Terminal Wire Color Ignition On: Volts Engine Running: Volts
Black/White(Pwr. Sply.) (1) 12.0 12.0
Green/Orange (Burn-Off) 0 0
Green/Blk. (Airflow Mass) 1.0-2.0 1.9-5.0
Green/White(Ground) (1) 0 0
Black/Orange (Ground) 0 0
(1) Black/White wire on 2.6L.
AIRFLOW METER TERMINAL RESISTANCE

Terminals (1) Fully Closed: Ohms Fully Open: Ohms
E2 & Vs 20-400 20-1000
E2 & Vc 100-300 100-300
E2 & Vb 200-400 200-400
E2 & THAa (2)
-4°F (-20°C) 13,600-18,400 13,600-18,400
68°F (20°C) 2210-2690 2210-2690
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) Intake air thermosensor.
ECT SENSOR RESISTANCE

Temperature Ohms
-4°F (-20°C) (1) 14,600-17,800
68°F (20°C) 2200-2700
176°F (80°C) 280-350
(1) Resistance is 14,500-17,800 ohms on 2.6L.
INTAKE AIR THERMOSENSOR RESISTANCE

Application Ohms
77°F (25°C) (1) 29,700-36,300
185°F (85°C) 3300-3700
(1) Resistance is 29,000-36,000 ohms on MPV.
OXYGEN SENSOR

Operating Condition Voltage
Rapidly Accelerating 0.5-1.0
Deceleration 0.0-0.4
TP SENSOR VOLTAGE

Red Wire Volts Blue Wire Volts: Closed Throttle Blue Wire Volts: WOT
4.50-4.59 .37-.54 3.58-4.23
4.60-4.69 .38-.55 3.66-4.32
4.70-4.79 .39-.56 3.74-4.41
4.80-4.89 .40-.57 3.82-4.51
4.90-4.99 .40-.58 3.90-4.60
5.00-5.09 .41-.60 3.97-4.70
5.10-5.19 .42-.61 4.05-4.79
5.20-5.29 .43-.62 4.13-4.88
5.30-5.39 .44-.63 4.21-4.98
5.40-5.49 .44-.64 4.29-5.07
5.50 .44-.66 4.29-5.17
TP SENSOR RESISTANCE

Application Ohms
Between Terminals "A" & "D" 3000-6000
Between Terminals "B" & "D"
Closed Throttle About 1000 Or Less
Wide Open Throttle 3000-6000
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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.