1995 Honda Prelude VTECFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts - 2.2L: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. Although an out-of-calibration sensor may not set a trouble code, 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.
COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE TEST (1)

Temperature - °F (°C) Ohms
-4 (-20) 15,000-18,000
68 (20) 1000-4000
176 (80) 200-400
(1) Measure resistance across sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE TEST (1)

Temperature - °F (°C) Ohms
-4 (-20) 15,000-18,000
68 (20) 1000-4000
176 (80) 200-400
(1) Measure resistance across sensor terminals.
MAP SENSOR VOLTAGE TEST (1)

Vacuum Applied - In. Hg Volts
0 2.8-3.0
5 2.3-2.5
10 1.8-2.0
15 1.3-1.5
20 .8-1.0
25 .3-.5
(1) Measure voltage at appropriate ECM terminals. See WIRING DIAGRAMS  section at the end of this article.
EGR LIFT SENSOR VOLTAGE TEST (1)

Position Volts (Approximate)
Fully Closed 1.2
Fully Open 4.3
(1) Measure voltage at appropriate ECM terminals. See WIRING DIAGRAMS  section. Voltage should increase smoothly as vacuum is applied.
OXYGEN SENSOR VOLTAGE TEST (1)

Condition Volts
Lean Less Than 0.4
Rich Greater Than 0.6
(1) Measure voltage between ground and oxygen sensor terminal using a high-impedance DVOM.
THROTTLE POSITION (TP) SENSOR VOLTAGE

Condition Volts
Throttle Valve
Fully Closed .5
Wide Open 4.5
VEHICLE SPEED SENSOR (VSS) TEST (1)

Application (2) Voltage
Accord 5
Odyssey 12
Prelude
Except H22A1 Engine 5
H22A1 Engine 12
(1) Backprobe terminals at sensor.
(2) Voltage will fluctuate between zero and specified value.
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.