Engine Control System & Engine Component Tests: Introduction
NOTE:
For system and component testing procedures on Passport, see
Rodeo in Isuzu SYSTEM & COMPONENT TESTING article.
Before testing separate components or systems, perform procedures in BASIC DIAGNOSTIC PROCEDURES article. Since many computer-controlled and monitored components set Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in appropriate SELF-DIAGNOSTICS article.
CAUTION:
Before disconnecting battery, obtain anti-theft code for radio. After battery is reconnected, the word CODE will appear on radio display. Enter 5-digit anti-theft code using select buttons and radio will begin working. If code is entered wrong 10 times, leave radio on at least one hour and enter code correctly. Any time radio power is lost, pre-selected radio stations will have to be set. For more information, see owners manual.
NOTE:
On Accord, Odyssey, Prelude and S2000 models, when substituting a known-good PCM, a temporary ignition key must be used or engine will not start. See SUBSTITUTING PCM in SELF-DIAGNOSTICS - INTRODUCTION
article. When replacing PCM, immobilizer code must be rewritten to replacement PCM using Honda PGM tester or engine will not start.
NOTE:
For testing and diagnosis of Variable Valve Timing (VTEC) system, see DTC P1253 or DTC P1259 in appropriate SELF-DIAGNOSTICS article.
NOTE:
Unless stated otherwise in testing procedures, preform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Carefully backprobe PCM harness connector using Backprobe Set (07SAZ-001000A) to avoid connector damage. Voltage readings may vary slightly due to battery condition or charging rate.
NOTE:
PCM may also be referred to as ECM. Generator may also be referred to as alternator.