Mazda 3 Workshop Manual page 575

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• IAC valve malfunction
• Air leakage from intake-air system
• Improper air/fuel mixture ratio control
• Evaporative emission control system malfunction
• TP sensor misadjustment
• TP sensor or related circuit malfunction
• MAF sensor or related circuit malfunction
• Brake switch or related circuit malfunction
• Neutral/clutch pedal position switch or related circuit malfunction
• Improper A/C magnetic clutch operation
Diagnostic procedure
STEP INSPECTION
• Does the engine idle rough?
1
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 the WDS or equivalent to the
DLC-2.
Retrieve any continuous memory, KOEO
4
and KOER DTCs using WDS or
equivalent.
Are there any DTCs displayed?
Downloaded from
RESULTS
Yes
No
Yes
No
Yes
No
Yes
No
https://carmanualshub.com/
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
[LF].)
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 [LF].)
No DTC is displayed:
- automotive repair manuals website
[LF].)