NO.26 EXHAUST SULPHUR SMELL [MZR 1.6]

id0103f9803200

26

EXHAUST SULPHUR SMELL
DESCRIPTION
•  Rotten egg smell (sulphur) from exhaust.
POSSIBLE CAUSE
•  Electrical connector disconnection
•  Poor fuel quality
•  Vacuum leakage
•  Continuous memory DTC is stored
•  Improper fuel pressure
•  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 the "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 1.6].) (See AFTER SERVICE PRECAUTION [MZR 1.6].)
Caution
•  If there is foreign material on the connecting area of the quick release connector, it might damage the connector or fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
Are any drive ability or exhaust smoke concerns present?
Yes
Go to the appropriate symptom troubleshooting.
(See SYMPTOM DIAGNOSTIC INDEX [MZR 1.6].)
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
Connect the M-MDS to the DLC-2.
Perform the KOEO or KOER self test.
(See KOEO/KOER SELF TEST [MZR 1.6].)
Are any continuous memory DTCs present?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE [MZR 1.6].)
No
Go to the next step.
4
Install the fuel pressure gauge between the fuel pipe and the fuel distributor.
Start the engine and idle it.
Is the fuel line pressure correct during idle?
(See FUEL LINE PRESSURE INSPECTION [MZR 1.6].)
Yes
Go to the next step.
No
Low:
•  Inspect the fuel line for clogging.
―  If there is a 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.
5
Inspect the charcoal canister for fuel saturation.
Is the excess amount of liquid fuel present in the charcoal canister?
Yes
Replace the charcoal canister.
(See CHARCOAL CANISTER REMOVAL/INSTALLATION [MZR 1.6].)
No
Inspect the fuel tank vent system.
(See FUEL TANK INSPECTION [MZR 1.6].)
•  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 sulfur content can vary in different fuels.
6
Verify the test results.
•  If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 1.6].)
•  If malfunction remains, inspect related Service information perform repair or diagnosis.
―  If vehicle repaired, troubleshooting completed.
―  If vehicle not repaired or additional diagnostic information not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)