1993 Honda Prelude VTECFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts: 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 drive ability problems.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DOOM) with a minimum 10-megohms input impedance.
COOLANT TEMPERATURE (ACT) 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 (NAT) 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 ACM terminals. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
ERG LIFT SENSOR VOLTAGE TEST (1)

Position Volts (Approximate)
Fully Closed 1.2
Fully Open 4.3
(1)
Measure voltage at appropriate ACM terminals. See WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
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 DOOM.
THROTTLE ANGLE (POSITION) SENSOR SPECIFICATIONS

Condition (1) Volts
Throttle Valve
Fully Closed .5
Wide Open 4.5
(1)
Voltage change from fully closed to wide open should be smooth.
VEHICLE SPEED SENSOR VOLTAGE TEST (1)

Application Volts
Accord (2) 0-12
Civic & Civic Del Sol (2) 0-5
Prelude
F22A1 & H23A1 Engines (2) 0-5
H22A1 Engine (2) 0-12
(1)
Back Probe terminals at sensor.
(2)
Pulses between specification limits with sensor turning.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.