Mazda 3 Workshop Manual page 407

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
VERIFY CURRENT INUPUT SIGNAL
STATUS OF FRONT HO2S
• Access O2S11 for P2177 PID using WDS
or equivalent.
• Check PID under following accelerator
pedal condition (in NEUTRAL).
• Is PID reading normal?
- Above 0.45 V when accelerator
pedal is suddenly depressed (rich
condition).
- 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 FOR EXCESSIVE AIR
SUCTION OF INTAKE AIR SYSTEM
• Visually inspect for loosen, cracks or
9
damages hoses on intake-air system.
• Is there any malfunction?
INSPECT PURGE SOLENOID
OPERATION
• Carry out Purge Control System
Inspection.
10
(See Purge Control System
• Does purge control system work
properly?
INSPECT FUEL LINE PRESSURE
• Turn ignition switch to off.
• Inspect fuel line pressure.
11
(See FUEL LINE PRESSURE
INSPECTION.)
• Is fuel line pressure normal?
Downloaded from
No
Yes Go to the next step.
No Replace MAF/IAT sensor, then go to Step 16.
Yes
No Go to the next step.
Yes Go to the next step.
No
Inspection.)
Yes Go to Step 12.
No
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Visually inspect for any gas leakage between
exhaust manifold and front HO2S.
Then go to Step 16.
Repair or replace source of air suction, then go
to Step 16.
Repair or replace malfunctioning part according
to inspection result, then go to Step 16.
If fuel pressure is too high, replace fuel pump
nit, then go to Step 16.
If fuel line pressure is low, go to the next step.
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