Mazda 3 Workshop Manual page 411

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- Below 0.45 V just after release of
accelerator pedal (lean condition)
VERIFY CURRENT INPUT SIGNAL
STATUS OF MAF SENSOR
• Connect the WDS or equivalent to the
DLC-2
• Start the engine.
8
• Access the MAF PID.
• Verify that the MAF PID changes quickly
according to engine speed.
• Is the PID normal?
INSPECT PURGE SOLENOID
OPERATION
• Carry out Purge Control System
Inspection.
9
(See Purge Control System
• Does purge control system work
properly?
INSPECT PCV VALVE OPERATION
• Inspect PCV valve operation.
(See POSITIVE CRANKCASE
10
VENTILATION (PCV) VALVE
INSPECTION.)
• Is PCV valve normal?
INSPECT EGR VALVE OPERATION
• Carry out EGR Control System
Inspection.
11
(See EGR Control System
• Does EGR control system work properly?
INSPECT VTCS OPERATION
• Carry out Variable Tumble Control
System (VTCS) Operation Inspection.
12
(See Variable Tumble Control Operation
Inspection.)
• Does VTCS work properly?
INSPECT FUEL LINE PRESSURE
• Turn ignition switch to off.
13
• Inspect fuel line pressure.
Downloaded from
Yes Go to the next step.
No Replace MAF/IAT sensor, then go to Step 15.
Yes Go to the next step.
No
Inspection.)
Yes Go to the next step.
No Replace PCV valve, then go to Step 15.
Yes Go to the next step.
No
Inspection.)
Yes Go to the next step.
No
Yes Go to the next step.
No
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Repair or replace malfunctioning part according
to inspection result, then go to Step 15.
Repair or replace malfunctioning part according
to inspection result, then go to Step 15.
Repair or replace malfunctioning part according
to inspection result, then go to Step 15.
If fuel pressure is too high, replace fuel pump
nit, then go to Step 15.
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