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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Self-Diagnostics - 1.6L) >> Diagnostic Tests >> DTC P0137, DTC P0138 & DTC P0140 >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
  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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