NO.26 EXHAUST SULPHUR SMELL [MZR 1.8, MZR 2.0, MZR 2.5]

id0103d4803200

26

EXHAUST SULPHUR SMELL
DESCRIPTION
•  Rotten egg smell (sulphur) from exhaust.
POSSIBLE CAUSE
•  Electrical connector disconnection
•  Poor fuel quality
•  Vacuum leakage
•  PCM DTC is stored
•  Excessive or insufficient fuel pressure
―  Fuel pump relay or fuel pump circuit malfunction
―  Clogging fuel line
―  Pressure regulator malfunction (built-in fuel pump unit)
―  Fuel pump unit malfunction
•  Charcoal canister malfunction
Warning
•  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system:
―  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 “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 1.8, MZR 2.0, MZR 2.5].) (See AFTER SERVICE PRECAUTION [MZR 1.8, MZR 2.0, MZR 2.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Are any drivability or exhaust smoke concerns present?
Yes
Go to the appropriate flow chart.
No
Go to the next step.
2
Inspect the following:
•  Electrical connections
•  Fuel quality
•  Vacuum lines
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
Repeat Step 2.
No
Go to the next step.
3
Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].)
No
Go to the next step.
4
Inspect the fuel line pressure.
(See FUEL LINE PRESSURE INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].)
Is there any malfunction?
Yes
Zero or low:
•  Inspect the fuel pump relay and the fuel pump circuit.
•  Inspect the fuel line for clogging.
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Replace the fuel pump unit.
High:
•  Replace the fuel pump unit.
No
Go to the next step.
5
Inspect the charcoal canister for fuel saturation.
Is an excess amount of liquid fuel present in the canister?
Yes
Replace the charcoal canister.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
No
Inspect the fuel tank vent system.
•  If the fuel tank vent system is not normal:
―  Repair or replace the malfunctioning part according to the inspection results.
•  If the fuel tank vent system is normal:
―  Suggest trying a different brand since the sulfur content can vary in different fuels.
6
Verify test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
―  If the vehicle is repaired, troubleshooting is completed.
―  If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.