NO.26 EXHAUST SULPHUR SMELL [WITH WU-TWC]


26	EXHAUST SULPHUR SMELL
DESCRIPTION	Rotten egg smell (sulphur) from the exhaust
POSSIBLE CAUSE	• Electrical connectors are disconnected or connected improperly • Charcoal canister malfunction • Vacuum lines are disconnected or connected improperly. • Improper fuel pressure • Poor fuel quality 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	Are any driveability or exhaust smoke concerns present?	Yes	Go to the appropriate flow chart.
1	Are any driveability or exhaust smoke concerns present?	No	Go to the next step.
2	Inspect the following: • Electrical connections • Vacuum lines • Fuel quality Are all items normal?	Yes	Go to the next step.
2		No	Service if necessary. Repeat Step 2.
3	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.
3		No	No DTC is displayed: Go to the next step.
4	Install a fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Is the fuel line pressure correct at idle?	Yes	Go to the next step.
4		No	Zero or low: • Inspect the fuel pump relay and the fuel pump related circuits. • Inspect for fuel leakage inside the pressure regulator. • Inspect for a clogged main fuel line. High: • Inspect the pressure regulator for the high pressure cause. • Inspect for a clogged fuel return line. • Inspect the vacuum hose to the pressure regulator.
5	Inspect the charcoal canister for fuel saturation. Is an excess amount of liquid fuel present in the charcoal canister?	Yes	Replace the charcoal canister.
5		No	Inspect the fuel tank vent system. • If the fuel tank vent system is normal, suggest trying a since sulfur content can vary in different fuels different brand. • If the fuel tank vent system is not normal, repair or replace the malfunctioning parts.
6	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.