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Home >> Suzuki >> 2003 >> XL-7 Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0443: EVAP Control System - Purge Control Valve Circuit Malfunction >> 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. Check EVAP canister purge system operation. See FUEL EVAPORATION under EMISSION SYSTEMS & SUBSYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister purge system operation is not okay, go to next step. If EVAP canister purge system operation is okay, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If intermittent problem is not found, substitute a known-good ECM and repeat DTC CONFIRMATION TEST .
  3. Check EVAP-CPV operation. See FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV operation is not okay, replace EVAP-CPV. After repair, repeat DTC CONFIRMATION TEST . If EVAP-CPV operation is okay, go to next step.
  4. Check for open or short in Blue/Black wire between EVAP-CPV, main relay and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Also, check for open or short in Green/Black wire between EVAP-CPV and ECM. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST . If no problem with wiring is found, go to next step.
  5. Substitute a known-good ECM, and repeat DTC CONFIRMATION TEST . If DTC does not reset, testing is complete.
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