Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

EXHAUST SULPHUR SMELL - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Are any driveability or exhaust smoke concerns present?	Yes	Go to appropriate flow chart.
1	Are any driveability or exhaust smoke concerns present?	No	Go to next step.
2	Inspect following; Electrical connections Vacuum lines Are all items okay?	Yes	Go to next step.
2		No	Service as necessary. Repeat Step 2.
3	Connect WDS or equivalent to DLC-2. Turn ignition key to ON (Engine OFF). Retrieve any DTC. Is "PASSED" displayed?	Yes	No DTC is displayed: Go to next step.
3		No	DTC is displayed: Go to appropriate DTC test.
4	Install fuel pressure gauge between pulsation damper and fuel distributor. Start engine and run it at idle. Is fuel line pressure correct at idle? Fuel line pressure 420-460 kPa {4.3-4.6 kgf/cm2, 61-66 psi}	Yes	Go to next step.
4		No	Zero or low: Inspect fuel pump circuit. Inspect for open fuel pump relief valve. Inspect for fuel leakage inside pressure regulator. Inspect for clogged main fuel line. High: Inspect pressure regulator for high pressure cause. Inspect for clogged fuel return line.
5	Inspect charcoal canister for fuel saturation. Is excess amount of liquid fuel present in canister?	Yes	Replace charcoal canister.
5		No	Inspect fuel tank vent system. If fuel tank vent system is okay, since sulfur content can vary in different fuels, try a different brand. If fuel tank vent system is not okay, repair or replace malfunctioning part.
6	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.