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Home >> Suzuki >> 1996 >> Sidekick JS, 2D Utility, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 1.6L >> Circuit Tests >> DTC P0171 - Fuel Trim Lean/DTC P0172 - Fuel Trim Rich
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DTC P0171 - Fuel Trim Lean/DTC P0172 - Fuel Trim Rich

  1. Check fuel pressure. See BASIC TESTING - 1.6L article. If fuel pressure is within specifications, go to next step. If fuel pressure is not as specified, repair as necessary. Retest system.
  2. Check fuel injectors. See TESTS in appropriate BASIC TESTING - 1.6L article. If problem exists, repair as necessary. Retest system. If fuel injectors are okay, go to next step.
  3. Check fuel lever sensor following procedures in DTC P0461. If problem exists, repair as necessary. Retest system. If fuel level sensor is okay, go to next step.
  4. Check MAF sensor circuit performance following procedures in DTC P0101. If problem exists, repair as necessary. Retest system. If MAF sensor circuit is okay, go to next step.
  5. Check ECT sensor circuit performance following procedures in DTC P0125. If problem exists, repair as necessary. Retest system. If ECT sensor circuit is okay, go to next step.
  6. Check HO2S No. 1 sensor circuit performance following procedures in DTCs P0131 and P0132. If problem exists, repair as necessary. If HO2S No. 1 sensor circuit is okay, replace PCM. Retest system.
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