Mazda 3 - Page 152

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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152
DTC P0505
IAC system problem
DETECTION
CONDITION
• The PCM cannot control idle speed toward target idle speed while KOER
self test.
POSSIBLE CAUSE
• IAC valve circuit malfunction
• Air cleaner element clogged
• Air intake passage clogged
• A/C relay control circuit malfunction
• Generator control circuit malfunction
• Low engine compression (Over capacity of blow-by gas)
• PCM malfunction
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair
information availability.
• Is any related repair information
available?
Yes
Perform repair or diagnosis according to the
available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
VERIFY RELATED PENDING OR
STORED DTC
• Turn the ignition switch off, then to the
ON position. (Engine OFF)
• Verify pending code or stored DTCs
using the WDS or equivalent.
• Does DTC P0511,P2502, P2503 or
P2504 present?
Yes
Perform the applicable DTC troubleshooting.
(See DTC TABLE [Z6].)
No
Go to the next step.
3
INSPECT IAC VALVE
MALFUNCTION
• Start engine.
• Disconnect IAC valve connector.
• Is engine speed decreased?
Yes
Go to the next step.
No
Repair the IAC valve, then go to Step 9.
(See IDLE AIR CONTROL (IAC) VALVE
REMOVAL/INSTALLATION [Z6].)
4
INSPECT A/C MAGNETIC CLUTCH
OPERATION
Note
• The following test should be
performed for A/C. Go to the
Yes
Go to "A/C ALWAYS ON / A/C COMPRESSOR
RUNS CONTINUOUSLY." of ENGINE SYMPTOM
TROUBLESHOOTING, then go to step 9.
(See ENGINE SYMPTOM TROUBLESHOOTING
[Z6].)
No
Go to the next step.