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Engine Controls - Basic Testing: Diagnosis Honda Odyssey I

Testing & Diagnostics ~307 words

VISUAL INSPECTION

Visually inspect all electrical wiring for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and not pinched or cut. See VACUUM DIAGRAMS article to verify routing and connections. Inspect air induction system for possible vacuum leaks.

Basic Diagnosis

Begin basic diagnosis of fuel system by determining fuel system pressure. If fuel pump fails to run, inspect power supply to PGM-FI main relay. If all power supplies are present (i.e., battery, ignition and starter switch during cranking), perform functional test of main relay. See WIRING DIAGRAMS section in this article and SYSTEM/COMPONENT TESTS articles.

Pressure Testing

  1. Disconnect negative battery terminal. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-16061-S16631802922000122900000) . Remove 6-mm service bolt and washer. Connect Fuel Pressure Gauge (07406-0040001 ) at 6-mm service bolt hole. Reconnect negative battery terminal. Remove vacuum hose from fuel pressure regulator. Start engine, and note fuel pressure. If engine will not start, turn ignition on, wait for 2 seconds, turn ignition off, then on again and read fuel pressure.
  2. With engine running, reconnect vacuum hose to fuel pressure regulator and note fuel pressure. Both gauge readings should be within specification. See «REGULATED FUEL PRESSURE»(ref-16061-S40602087562000122900000) . If fuel pressure is higher than specified, check for pinched or clogged fuel return hose or defective fuel pressure regulator. If fuel pressure is lower than specified, check for clogged fuel filter, defective fuel pressure regulator or fuel line leakage.
  3. Relieve fuel pressure and remove gauge. Reinstall 6-mm service bolt using new washer. Tighter 6-mm service bolt to 106 INCH lbs. (12 N.m). Start engine and check for leaks. REGULATED FUEL PRESSURE Application At Idle psi (kg/cm 2 ) Vacuum Hose Disconnected 38-46 (2.7-3.2) Vacuum Hose Connected 30-37 (2.1-2.6)

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