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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-757 • Volumetric efficiency is between 20 and 70 per- cent. • The fuel tank temperature is 36°C (97°F) or less. • The fuel tank differential pressure sensor output voltage is 1 − 4 volts. Check Conditions C: For Test to Stop • The intake air temperature is greater than 5°C (41 °F). • When the evaporative emission purge solenoid and evaporative emission ventilation solenoid are − 40 percent of capacity upon engine start-up. • When the evaporative emission purge solenoid and evaporative emission ventilation solenoid are − 85 percent of capacity upon engine start-up. • 10 seconds have elapsed from the start of the previous monitoring. • Monitoring time: 150 seconds. Judgment Criteria • The fuel tank internal pressure is 2 kPa (0.29 psi) or more after the evaporative emission purge . OBD-ll DRIVE CYCLE PATTERN − OBD-ll Drive Cycle − Procedure 1 − Evaporative Emission System Leak Monitor . TROUBLESHOOTING HINTS (The most likely • Loose fuel cap. • Fuel cap relief pressure is incorrect. • Fuel overflow limiter valve failed. • Purge line or vapor line is clogged. • Fuel tank, purge line or vapor line seal failed. • Evaporative emission purge solenoid valve failed. • Evaporative emission ventilation solenoid valve failed. • Fuel tank differential pressure sensor failed. • Evaporative emission canister seal is faulty. • Evaporative emission canister is clogged. |