Mazda 3 Workshop Manual page 478

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Improper A/C magnetic clutch operation
Diagnostic procedure
STEP INSPECTION
1 Does the engine idle rough?
Turn off the A/C switch and fan switch.
2
Does the A/C magnetic clutch engage?
Verify the following:
• Proper routing and no damage of
vacuum lines
3
• IAC valve is connected properly.
• No air leakage from intake-air system
Are all items normal?
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO
4 and KOER DTCs using WDS or
equivalent.
Are there any DTCs displayed?
Does the idle speed drop or stall when
5
disconnecting the IAC valve?
Disconnect the vacuum hose between the
6
purge solenoid valve and the intake
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ACTION
Go to symptom troubleshooting "No.8
Engine runs rough/rolling idle".
(See NO.8 ENGINE RUNS
ROUGH/ROLLING IDLE
Go to the next step.
Go to symptom troubleshooting "No.24
A/C is always on or A/C compressor runs
continuously."
(See NO.24 A/C IS ALWAYS ON OR A/C
COMPRESSOR RUNS CONTINUOUSLY
[Z6].)
Go to the next step.
Go to the next step.
Service if necessary.
Repeat Step 3.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
No DTC is displayed:
Go to the next step.
Go to the next step.
Inspect the following:
• Circuit from IAC valve to PCM terminal
2X or 2AB for open and short
• IAC valve for sticking
If normal, go to the next step.
Inspect EVAP control system.
(See Purge Control System
- automotive repair manuals website
[Z6].)
Inspection.)