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Home >> Suzuki >> 2004 >> Vitara RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0448: Evaporative Emissions System - Vent Control Circuit Open >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Turn ignition on. Using scan tool, observe EVAP canister vent valve parameter. If parameter is about zero percent, problem is intermittent. See DIAGNOSTIC AIDS . If parameter is not as specified, go to next step.
  3. Turn ignition off. Disconnect EVAP canister vent valve 2-pin harness connector. EVAP canister vent valve is located next to EVAP canister. Disconnect PCM Red 80-pin harness connector E-22. PCM is located at right rear of engine compartment. Check for open or short circuit in Blue/Pink wire between EVAP canister vent valve and PCM. See WIRING DIAGRAMS article. If problem is found, go to next step.
  4. Repair open or short circuit in Blue/Pink wire between EVAP canister vent valve and PCM. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  5. Using DVOM, measure resistance between EVAP canister vent valve pins. At 68°F (20°C) resistance reading should be 21.8-28.5 ohms. If resistance is as specified, go to step  7. If resistance is not as specified, go to next step.
  6. Replace EVAP canister vent valve. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  7. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
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