1992 Acura Vigor LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Code 45: Fuel Metering System

  1. Turn ignition off. Remove BACK UP fuse from underhood fuse/relay box for 10 seconds to reset ECU. Start engine, and allow cooling fan to come on. Road test vehicle using the following procedure:
    • With transaxle in D (A/T) or 3rd gear (M/T), cruise at exactly 35 MPH for 10 seconds.
    • Release throttle and allow vehicle to decelerate below 30 MPH.
    • Accelerate to exactly 35 MPH and cruise for 10 seconds.
  2. Repeat procedure 10 times. Check ECU for fault codes. See RETRIEVING CODES  . If Code 45 is present, go to step 3). If Code 45 is not present, stop vehicle and turn ignition off. Start vehicle and repeat procedure another 5 times. If Code 45 is still not present, problem is intermittent and cannot be duplicated at this time.
  3. If Code 45 is present, turn ignition off. Check fuel pressure. See BASIC TESTING article in the ENGINE PERFORMANCE Section. Repair if necessary. If fuel pressure is okay, install a known good MAP sensor. Repeat steps 1) and 2). If Code 45 is not present, replace original MAP sensor. If code 45 is present, go to step 4).
  4. Install known good fuel injectors. Repeat steps 1) and 2). If Code 45 is not present, replace original fuel injectors. If Code 45 is still present, inspect fuel line between fuel injectors and fuel filter. If restriction is found, replace or repair as necessary. If no restriction is found, substitute a known good ECU, and retest system. If symptom/problem goes away, replace original ECU.
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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.