Mazda 3 - Page 359

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Downloaded from https://carmanualshub.com/ - automotive repair manuals website
359
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 [LF].)
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 IAC valve, then go to Step 9.
4
INSPECT A/C MAGNETIC CLUTCH
OPERATION
Note
• The following test should be
performed for the A/C. Go to
the next step for vehicles
without A/C
• Turn the fan switch off.
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
[LF].)
No
Go to the next step.