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Home >> Acura >> 2003 >> MDX Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Performance System Self-Diagnostics >> Diagnostic Tests >> DTC P2A00 Or DTC P2A03
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DTC P2A00 Or DTC P2A03

Code Definition

CAUTION: When substituting or replacement of PCM is recommended, see PCM REMOVAL & REPLACEMENT  for important precautions.
NOTE: This test covers both Front and Rear Air Fuel Ratio (A/F) sensors. The information will be shown Rear (Bank 1) first and Front (Bank 2) second. When discussion of PCM harness connector terminals arises, Rear (A/F) ratio sensor terminals will precede Front A/F ratio sensor terminals. Also, Front A/F ratio sensor terminal information will be enclosed in parentheses ( ).
  1. Using Honda PGM Tester or the HDS, do the DTC CLEAR in the CLEAR menu. Start engine. Hold engine at 3000 RPM with no load in (Park or Neutral) until the radiator fan comes on, then let engine idle.
  2. Using Honda PGM Tester or the HDS, check AF FB AVE (LT FUEL TRIM) in the DATA list. If the value measured is 0.8-1.2, go to next step. If the value measured is not 0.8-1.2, go to next step  1 and recheck.
  3. Test drive vehicle under the following conditions:
    • Engine coolant temperature more than 158°F (70°C).
    • A/T in "D" position.
    • Vehicle speed at 30 MPH or more and engine speed at 2300 RPM or less.
    • Drive with throttle fully opened for 5 seconds from an engine speed of 1600 RPM, then decelerate with the throttle fully closed.
  4. Using the Honda PGM Tester or the HDS, monitor OBD STATUS for DTCs P2A00 and/or (P2A03) in the DTCs menu. If it FAILED, go to next step. If it is passed problem is intermittent, system is OK. If it is EXECUTING, keep driving until the results come on. If it is OUT OF CONDITION, go to step 1 and recheck.
  5. Turn ignition off. Replace A/F ratio sensor. Go to next step
  6. Turn ignition on. Using Honda PGM Tester or the HDS, do the DTC CLEAR in the CLEAR menu. Start engine. Hold engine at 3000 RPM with no load in (Park or Neutral) until the radiator fan comes on, then let engine idle.
  7. Using Honda PGM Tester or the HDS, check AF FB AVE (LT FUEL TRIM) in the DATA list. If the value measured is 0.8-1.2, go to next step. If the value measured is not 0.8-1.2, go to next step  6 and recheck.
  8. Test drive vehicle under the following conditions:
    • Engine coolant temperature more than 158°F (70°C).
    • A/T in "D" position.
    • Vehicle speed at 30 MPH or more and engine speed at 2300 RPM or less.
    • Drive with throttle fully opened for 5 seconds from an engine speed of 1600 RPM, then decelerate with the throttle fully closed.
  9. Using Honda PGM Tester or the HDS, check for Temporary DTCs or DTCs in the DTC menu. If DTCs P2A00 and/or (P2A03) are set, check for poor connections or loose terminals at A/F ratio sensor and PCM harness connector. Go to step  1 . If any other Temporary DTCs or DTCs are set, troubleshoot those indicated. If DTCs P2A00 and/or (P2A03) are not set, go to next step.
  10. Using the Honda PGM Tester or the HDS, monitor OBD STATUS for DTCs P2A00 and/or (P2A03) in the DTCs menu. If it FAILED, go to next step. If it is passed problem is intermittent, system is OK. If it is EXECUTING, keep driving until the results come on. If it is OUT OF CONDITION, go to step  6 and recheck.
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