Mazda 3 Workshop Manual page 152

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DTC P0505
DETECTION
CONDITION
POSSIBLE CAUSE
Diagnostic procedure
STEP INSPECTION
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair
1
information availability.
• Is any related repair information
available?
VERIFY RELATED PENDING OR
STORED DTC
• Turn the ignition switch off, then to the
ON position. (Engine OFF)
2
• Verify pending code or stored DTCs
using the WDS or equivalent.
• Does DTC P0511,P2502, P2503 or
P2504 present?
INSPECT IAC VALVE
MALFUNCTION
• Start engine.
3
• Disconnect IAC valve connector.
• Is engine speed decreased?
INSPECT A/C MAGNETIC CLUTCH
OPERATION
4
Note
• The following test should be
performed for A/C. Go to the
Downloaded from
• The PCM cannot control idle speed toward target idle speed while KOER
self test.
• 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
Yes
No Go to the next step.
Yes
No Go to the next step.
Yes Go to the next step.
No
Yes
No Go to the next step.
https://carmanualshub.com/
IAC system problem
ACTION
Perform repair or diagnosis according to the
available repair information.
• If the vehicle is not repaired, go to the next step.
Perform the applicable DTC troubleshooting.
(See DTC TABLE [Z6].)
Repair the IAC valve, then go to Step 9.
(See IDLE AIR CONTROL (IAC) VALVE
REMOVAL/INSTALLATION
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].)
- automotive repair manuals website
[Z6].)