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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 574 (Symptom Troubleshooting (Engine - MZI-3.7)) >> No. 26 Exhaust Sulphur Smell [MZI-3.7] >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION RESULTS ACTION
1 Are any driveability or exhaust smoke concerns present? Yes Go to the appropriate flow chart
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
No Service if necessary Repeat Step 2
3 Connect the M-MDS to the DLC-2
Switch ignition to ON (Engine off)
Retrieve any DTCs
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to the appropriate DTC inspection
(See DTC TABLE [MZI-3.7]
No No DTC is displayed: 
Go to the next step
4 Install the fuel pressure gauge between the fuel pipe and the fuel distributor
Start engine and idle it.
Is fuel line pressure correct at idle?
(See FUEL LINE PRESSURE INSPECTION [MZI-3.7] .)		 Yes Go to the next step.
No Low: 
Perform "Fuel Pump Operation Inspection" and "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
High: 
Perform "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results.
If there is no malfunction, replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
5 Inspect the charcoal canister for fuel saturation.
Is excess amount of liquid fuel present in canister?		 Yes Replace the charcoal canister.
No Inspect the fuel tank vent system.
If the fuel tank vent system is normal, suggest trying a different brand since sulphur content can vary in different fuels.
If the fuel tank vent system is not normal, repair or replace the malfunctioning part.
6
  • Verify test results.
    • If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .)
    • 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, reprogram the PCM if a later calibration is available. Retest
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