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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0447: Evaporative Emissions System - Vent Valve Circuit Open >> Diagnostic Procedure

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. Start engine and rev engine 3 or 4 times. Using scan tool, observe EVAP canister vent valve parameter. If EVAP canister vent valve is ON, problem is intermittent. See DIAGNOSTIC AIDS . If EVAP canister vent valve is not ON, 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. Turn ignition on. Using DVOM, measure voltage between ground and EVAP canister vent valve harness connector terminal No. 1 (Black/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step  5.
  4. Turn ignition off. 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 Black/Yellow wire between EVAP canister vent valve and PCM. See WIRING DIAGRAMS article. If problem is found, go to next step.
  5. Repair open or short circuit in Black/Yellow wire between EVAP canister vent valve and PCM. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  6. 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  8. If resistance is not as specified, go to next step.
  7. Replace EVAP canister vent valve. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  8. 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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