NO.26 EXHAUST SULPHUR SMELL [MZR 1.3, MZR 1.5]

id0103d7803200

26

EXHAUST SULPHUR SMELL
DESCRIPTION
•  Rotten egg smell (sulphur) from exhaust.
POSSIBLE CAUSE
•  Electrical connector disconnected
•  Poor fuel quality
•  Vacuum leakage
•  Continuous memory DTC is stored
•  Improper fuel pressure
―  Restriction in fuel line
―  Pressure regulator malfunction (built-into fuel pump unit)
―  Fuel pump relay or fuel pump circuit malfunction
•  Charcoal canister malfunction
•  Fuel tank vent system malfunction
•  PCM malfunction
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 “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 1.3, MZR 1.5].) (See AFTER SERVICE PRECAUTION [MZR 1.3, MZR 1.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to fuel pipe and 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
VERIFY IF THERE IS DRIVEABILITY MALFUNCTION OR EXHAUST GAS MALFUNCTION
•  Are any drivability or exhaust smoke concerns present?
Yes
Go to the appropriate flow chart.
(See SYMPTOM DIAGNOSTIC INDEX [MZR 1.3, MZR 1.5].)
No
Go to the next step.
2
INSPECT RELATED PART CONDITION
•  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
VERIFY PCM DTC
•  Perform the PCM DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.3, MZR 1.5].)
No
Go to the next step.
4
INSPECT FUEL LINE PRESSURE
•  Install the fuel pressure gauge between fuel pipe and fuel distributor.
•  Start the engine and idle it.
•  Measure the fuel line pressure during idle.
•  Is there any malfunction?
Yes
Low:
•  Inspect the fuel line for restriction.
―  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. (pressure regulator or fuel pump malfunction)
High:
•  Replace the fuel pump unit. (pressure regulator malfunction)
No
Go to the next step.
5
DETERMINE IF MALFUNCTION CAUSE IS CHARCOAL CANISTER OR FUEL TANK VENT SYSTEM
•  Inspect the charcoal canister for fuel saturation.
•  Is an excess amount of liquid fuel present in the charcoal canister?
Yes
Replace the charcoal canister.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
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, replace the PCM.