NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZ-CD 1.6 (Y6)]

20	FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION	• Fuel smell or visible leakage.
POSSIBLE CAUSE	• Excessive fuel pressure • Fuel metering valve malfunction • Fuel pressure limiter malfunction • Fuel pressure sensor or related circuit malfunction • Fuel leakage Предупреждение 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 injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.

FUEL ODOR (IN ENGINE COMPARTMENT)

DESCRIPTION

• Fuel smell or visible leakage.

POSSIBLE CAUSE

• Excessive fuel pressure

• Fuel metering valve malfunction

• Fuel pressure limiter malfunction

• Fuel pressure sensor or related circuit malfunction

• Fuel leakage

Предупреждение

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 injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.

STEP	INSPECTION	RESULTS	ACTION
1	Visually inspect fuel leakage at fuel injector and fuel line. Is there any fuel leakage?	Yes	Service if necessary.
No	Go to the next step.
2	Visually inspect for damaged or cracked fuel filter. Is the fuel filter normal?	Yes	Go to the next step.
No	Replace the fuel filter.
3	Inspect fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [MZ-CD 1.6 (Y6)].) Is the fuel pressure normal?	Yes	Go to the next step.
No	Repair or replace if necessary.
4	Inspect fuel metering valve. (See ПРОВЕРКА ДОЗИРУЮЩЕГО КЛАПАНА [MZ-CD 1.6 (Y6)].) Is the fuel metering valve normal?	Yes	Go to the next step.
No	Replace the fuel pump. (See СНЯТИЕ И УСТАНОВКА ТНВД [MZ-CD 1.6 (Y6)].)
5	Perform the self-test function using the M-MDS. Turn the engine switch to the ON position. Retrieve any DTC. Are DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. Communication error message is displayed: Inspect for the following: • Open circuit between PCM control relay and PCM terminal 236 or 231 • Open circuit between PCM control relay and PCM terminal 241 • PCM control relay stuck open • Open or poor ground circuit (PCM terminal 307, 308 or 332) • Poorly connected vehicle body ground
No	No DTC is displayed: Remove and inspect the common rail.
6	Verify test results. • If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZ-CD 1.6 (Y6)].) • If the malfunction remains, inspect related Service Information and perform 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. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)

STEP

INSPECTION

RESULTS

ACTION

Visually inspect fuel leakage at fuel injector and fuel line.

Is there any fuel leakage?

Yes

Service if necessary.

Go to the next step.

Visually inspect for damaged or cracked fuel filter.

Is the fuel filter normal?

Yes

Go to the next step.

Replace the fuel filter.

Inspect fuel pressure sensor.

(See FUEL PRESSURE SENSOR INSPECTION [MZ-CD 1.6 (Y6)].)

Is the fuel pressure normal?

Yes

Go to the next step.

Repair or replace if necessary.

Inspect fuel metering valve.

(See ПРОВЕРКА ДОЗИРУЮЩЕГО КЛАПАНА [MZ-CD 1.6 (Y6)].)

Is the fuel metering valve normal?

Yes

Go to the next step.

Replace the fuel pump.

(See СНЯТИЕ И УСТАНОВКА ТНВД [MZ-CD 1.6 (Y6)].)

Perform the self-test function using the M-MDS.

Turn the engine switch to the ON position.

Retrieve any DTC.

Are DTCs displayed?

Yes

DTC is displayed:

Go to the appropriate DTC test.

Communication error message is displayed:

Inspect for the following:

• Open circuit between PCM control relay and PCM terminal 236 or 231

• Open circuit between PCM control relay and PCM terminal 241

• PCM control relay stuck open

• Open or poor ground circuit (PCM terminal 307, 308 or 332)

• Poorly connected vehicle body ground

No DTC is displayed:

Remove and inspect the common rail.

Verify test results.

• If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZ-CD 1.6 (Y6)].)

• If the malfunction remains, inspect related Service Information and perform 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. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)