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Diagnosis & Repair Procedure

NOTE: For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
NOTE: Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform TEST D: ENGINE SYSTEM CHECK  under SYSTEM TESTS, then go to next step.
  2. Turn ignition to LOCK position. Check fuel filler cap for proper installation, and cap gasket for deterioration. If fuel filler cap is okay, go to next step. If fuel filler cap is faulty, tighten or replace fuel filler cap. After repair, repeat DTC CONFIRMATION TEST .
  3. Check EVAP system vacuum hoses for proper connection, leakage, plugging or deterioration. If vacuum hoses are okay, go to next step. If vacuum hoses are faulty, repair as necessary and repeat DTC CONFIRMATION TEST .
  4. Check EVAP canister vent valve and circuit. See Perform EVAP canister purge valve and circuit check. See EVAP CANISTER VENT VALVE CIRCUIT under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister vent valve and circuit are okay, go to next step. If EVAP canister vent valve and/or circuit are faulty, go to step  10.
  5. Check fuel level sensor and circuit referring to DTC P0461: FUEL LEVEL SENSOR CIRCUIT - PERFORMANCE . If diagnostic procedure results are okay, go to next step. If diagnostic procedure results are faulty, repair as necessary and repeat DTC CONFIRMATION TEST .
  6. Check EVAP canister for damage. See EVAP CANISTER under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister is okay, go to next step. If EVAP canister is faulty, replace EVAP canister and repeat DTC CONFIRMATION TEST .
  7. Check fuel tank, purge line and EVAP system components for leakage. See EVAP SYSTEM LEAKAGE CHECK under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. For vacuum hose locations, see appropriate vacuum diagram in VACUUM DIAGRAMS article. If EVAP system components are okay, go to next step. If EVAP system leak is found, repair as necessary and repeat DTC CONFIRMATION TEST .
  8. Perform FTP sensor component test. See FUEL TANK PRESSURE SENSOR under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is okay, go to next step. If FTP sensor is faulty, replace FTP sensor. After repair, repeat DTC CONFIRMATION TEST .
  9. Perform FTP control valve component test. See FUEL TANK PRESSURE CONTROL VALVE under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP control valve is okay, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO-CODES article. If FTP control valve is faulty, replace FTP control valve. After repair, repeat DTC CONFIRMATION TEST .
  10. Perform EVAP canister vent valve component test. See EVAP CANISTER VENT VALVE under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister vent valve is faulty, replace EVAP canister vent valve. After repair, repeat DTC CONFIRMATION TEST . If EVAP canister vent valve is okay, check EVAP canister vent valve circuits for open or short in Red/Black wire and Blue/White wire between EVAP canister vent valve and ECM. If short or open circuit is found, repair as necessary. If short or open circuit is not found, substitute ECM with a known good unit and repeat DTC CONFIRMATION TEST .
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