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Home >> Acura >> 1993 >> Legend Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Codes >> Code 45 Or 46: Fuel Metering System
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Code 45 Or 46: Fuel Metering System

  1. Turn ignition off. Remove ACG fuse (No. 15, 7.5-amp) from underdash fuse box for 10 seconds to reset ECM. Start engine, and allow cooling fan to come on. Road test using following procedure:
    • With transaxle in D (A/T) or 3rd gear (M/T), cruise at exactly 35 MPH for 10 seconds.
    • Release throttle. Allow vehicle to decelerate to less than 30 MPH.
    • Accelerate to exactly 35 MPH and cruise for 10 seconds.
    • Repeat procedure 10 times.
    • Stop vehicle. Turn ignition off.
    • Start vehicle. Repeat acceleration/deceleration procedure 5 times.
  2. Check ECM for fault codes. If Code 45 or 46 is not present, problem is intermittent and cannot be duplicated at this time.
  3. If Code 45 or 46 is present, turn ignition off. Check fuel pressure. See BASIC TESTING article in this section. Repair if necessary. If fuel pressure is okay, install a known good MAP sensor. Repeat step 1 and check ECM for fault codes. If Code 45 or 46 is not present, replace original MAP sensor. If Code 45 or Code 46 is present, go to step 4.
  4. If Code 45 is present, install known good injectors on left side of engine. If Code 46 is present, install known good injectors on right side of engine. If Code 45 and 46 are present, install known good injectors on both sides of engine.
  5. Repeat step 1 and check ECM for fault codes. If codes are not present, replace original fuel injectors. If code is present, inspect fuel line between fuel injectors and fuel filter. If restriction is found, replace or repair as necessary. If restriction is not found, replace ECM and retest.
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