NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [WITH WU-TWC]


20	FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION	Gasoline fuel odor or visible leakage
POSSIBLE CAUSE	• Excessive fuel pressure • Purge solenoid valve malfunction • Fuel tank vent system blockage • Charcoal canister malfunction • Fuel leakage from fuel system Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. Caution • If there is foreign material on the connecting area of the quick release connector, it might damage the connector or the fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.


STEP	INSPECTION	RESULTS	ACTION
1	Visually inspect for fuel leakage at the fuel injector O-ring and fuel line. Service if necessary. Install a fuel pressure gauge between fuel pipe and the fuel distributor. Start the engine and idle it. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle?	Yes	Go to the next step.
1		No	Inspect the pressure regulator for the cause of high pressure.
2	Inspect for blockage/restriction or openings between the engine vacuum port and the charcoal canister. Inspect for blockage in the fuel tank vent system. Are there any malfunction?	Yes	Replace the vacuum hose.
2		No	Go to the next step.
3	Inspect the purge solenoid valve. Does the solenoid operate properly?	Yes	Go to the next step.
3		No	Replace the purge solenoid valve.
4	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. (See KOEO/KOER SELF-TEST.) Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test.
4		No	No DTC is displayed: Inspect the charcoal canister for fuel saturation. • If an excess amount of liquid fuel is present, replace the charcoal canister.
5	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect related Service information and perform repair or diagnosis. - If the vehicle is repaired, the troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.