Mazda 3 Workshop Manual page 518

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Diagnostic procedure
STEP INSPECTION
Are any drive ability or exhaust
1
smoke concerns present?
Inspect following:
• Electrical connections
• Vacuum lines
2
• Fuel quality
Are all items normal?
Connect WDS or equivalent to
DLC-2.
Retrieve any continuous
3
memory, KOEO and KOER
DTCs using WDS or equivalent.
Are there any DTCs displayed?
Install fuel pressure gauge
between the fuel pipe and the
fuel distributor.
Start the engine and idle it.
4
Is fuel line pressure correct
during idle?
(See FUEL LINE PRESSURE
INSPECTION.)
Inspect the charcoal canister for
fuel saturation.
5
Is excess amount of liquid fuel
present in the charcoal canister?
Verify test results.
6
• If normal, return to diagnostic index to service any additional symptoms.
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ACTION
Go to appropriate flow chart.
Go to the next step.
Go to the next step.
Service if necessary.
Repeat Step 2.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
No DTC is displayed:
Go to the next step.
Go to the next step.
Low:
Inspect the fuel line for clogging.
• If normal, replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Replace the charcoal canister.
Inspect fuel tank vent system.
• If fuel tank vent system is normal, suggest trying
a different brand since sulfur content can vary in
different fuels.
• If the fuel tank vent system is not normal, repair
or replace the malfunctioning part.
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