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Home >> Suzuki >> 2002 >> Esteem GL, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.6L >> Diagnostic Tests >> DTC P0137, DTC P0138 & DTC P0140 >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Inspect exhaust system for damage or leaks. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If exhaust system is okay, ensure fuel tank is not empty. Add fuel as necessary and go to next step.
  3. If HO2S No. 2 output voltage as tested in step  2 of DTC confirmation test is less than 1.275 volts, go to next step. If output voltage is not as specified, check for open in Blue wire between HO2S No. 2 and ECM. See WIRING DIAGRAMS article. Also, check for open in Pink wire between HO2S No. 2 and ECM. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  .
  4. If short term fuel trim varied between -20 and 20 percent, go to next step. If short term fuel trim does not vary between -20 and 20 percent, check fuel system operation. See DTC P0171 OR P0172  .
  5. Turn ignition off. Check for poor terminal contact at HO2S No. 2 and ECM harness connectors. If poor terminal contact is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  6. Check for open or short in Blue wire between HO2S No. 2 connector terminal No. 1 and ECM 22-pin connector E92 terminal No. 22, and in Pink wire between HO2S No. 2 connector terminal No. 2 and ECM 22-pin connector E92 terminal No. 10. See Figure . See WIRING DIAGRAMS article. If wires are okay, check for faulty HO2S No. 2. If problem is found, repair or replace as necessary. After repair, repeat DTC CONFIRMATION TEST  .
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