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2008 - MX-5 - Engine

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [LF]



20

FUEL ODOR (IN ENGINE COMPARTMENT)

DESCRIPTION

Gasoline fuel smell or visible leakage

POSSIBLE CAUSE

  • Excessive fuel pressure

  • Purge solenoid valve malfunction

  • Fuel tank vent system blockage

  • Charcoal canister malfunction

  • Fuel leakage from fuel system

WARNING:

The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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 [LF].)

    (See AFTER SERVICE PRECAUTION [LF].)

CAUTION:

  • Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean 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

Visually inspect for fuel leakage at fuel injector O-ring and fuel line.

Service if necessary.

Install the fuel pressure gauge between the fuel pipe and the fuel distributor.

Start engine and idle it.

Measure fuel line pressure during idle.

Is fuel line pressure correct during idle?

(See FUEL LINE PRESSURE INSPECTION [LF].)

Yes

Go to the next step.

No

Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [LF].)

2

Inspect for blockage/restriction or open circuit in wiring harness between the engine vacuum port and the charcoal canister.

Inspect for blockage in fuel tank vent system.

Is malfunction indicated?

Yes

Replace vacuum hose.

No

Go to the next step.

3

Inspect the purge solenoid valve.

(See PURGE SOLENOID VALVE INSPECTION [LF].)

Is the solenoid operating properly?

Yes

Go to the next step.

No

Replace the purge solenoid valve.

(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [LF].)

4

Connect the M-MDS to the DLC-2.

Turn the ignition switch to the ON position (Engine off).

Retrieve any DTCs.

Are there any DTCs displayed?

Yes

DTC is displayed:

Go to the appropriate DTC inspection.

(See DTC TABLE [LF].)

No

No DTC is displayed:

Inspect charcoal canister for fuel saturation.

If excess amount of liquid fuel is present, replace the charcoal canister.

5

  • Verify test results.

    • If normal, return to diagnostic index to service any additional symptoms.

      (See SYMPTOM DIAGNOSTIC INDEX [LF].)

    • 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, replace the PCM.

        (See PCM REMOVAL/INSTALLATION [LF].)




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