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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0449: Evaporative Emission Control System - Vent Valve/Solenoid Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. 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 with engine off. Using scan tool, read and record FAILURE RECORDS data. Clear DTCs. Start engine and operate vehicle within noted FAILURE RECORDS data conditions. If scan tool indicates DTC P0449 RAN AND PASSED, check for intermittent problem. See DIAGNOSTIC AIDS  . If scan tool does not indicate DTC P0449 RAN AND PASSED, go to next step.
  3. Turn engine off. Disconnect EVAP canister vent valve 2-pin harness connector. EVAP canister vent valve is located on EVAP canister, under vehicle. Turn ignition on. Using DVOM, measure voltage between ground and EVAP canister vent valve harness connector terminal No. 1 (Black/Yellow wire). See WIRING DIAGRAMS article. If battery voltage exists, leave harness connector disconnected and go to step  5 . If battery voltage does not exist, harness connector disconnected and go to next step.
  4. Check for open, short to ground or short to voltage in Black/Yellow wire between CB-12 ENGINE IG (15-amp) fuse and EVAP canister vent valve. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  5. Using DVOM, measure resistance between EVAP canister vent valve pins No. 1 and 2 (component side). Resistance should be less than 5 ohms. If resistance is as specified, go to next step. If resistance is not as specified, go to step  7 .
  6. Turn ignition off. Disconnect PCM Red 32-pin harness connector C-1. PCM is located under center console in front of shifter. Check for open, short to ground or short to voltage in Brown/White wire between PCM and EVAP canister vent valve. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  7. Replace EVAP canister vent solenoid. 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. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
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