1996 Ford Aspire 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts 1.3L: 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 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.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR VOLTAGE(1)

Temperature °F (°C) (2) Voltage
-4 (-20) 4.7
32 (0) 3.4
68 (20) 2.5
104 (40) 2.0
176 (80) 0.7
212 (100) 0.2
(1) Measure voltage between breakout box test pins No. 41 and 49.
(2) Voltage may vary plus or minus 15 percent.
EGR BOOST (EGRB) SENSOR(1)

Vacuum (In. Hg) (2) Volts
4.4 0.3
11.8 1.5
28.1 4.3
31.0 4.8
(1) Measure voltage between breakout box test pins No. 48 and 49.
(2) Voltage may vary plus or minus 10 percent.
INTAKE AIR TEMPERATURE (IAT) SENSOR VOLTAGE(1)

Temperature °F (°C) (2) Voltage
-4 (-20) 4.7
32 (0) 3.4
68 (20) 2.5
104 (40) 2.0
140 (60) 1.2
176 (80) 0.7
(1) Measure voltage between breakout box test pins No. 45 and 49.
(2) Voltage may vary plus or minus 15 percent.
OXYGEN SENSOR (O2S) VOLTAGE(1)

Engine Condition Voltage
KOEO Less Than 1.0
Idle Less Than 1.0
Deceleration 0-0.4
Acceleration 0.5-1.0
(1) Measure voltage between breakout box test pins No. 78 and 49.
HEATED OXYGEN SENSOR (HO2S) VOLTAGE(1)

Engine Condition Voltage
KOEO Less Than 1.0
Idle Less Than 1.0
Deceleration 0-1.0
Acceleration 0-1.0
(1) Measure voltage between breakout box test pins No. 26 and 49.
MASS AIRFLOW (MAF) SENSOR(1)

Engine Condition Volts
KOEO 1-1.5
Hot Idle 2.0
30 MPH 2.6
55 MPH 2.8
(1) Measure voltage between breakout box test pins No. 38 and 25.
THROTTLE POSITION (TP) SENSOR OUTPUT VOLTAGE(1)

Throttle Position (2) Voltage
0 0.5
1/4 1.3
1/2 2.2
3/4 2.9
Full 3.7
(1) Measure voltage between breakout box pins No. 40 and 49.
(2) Voltage may vary plus or minus 15 percent.
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.