Mazda 3 Workshop Manual page 552

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Intake-air system restriction (e.g. air
cleaner element, fresh air duct.)
Are all items normal?
Connect the WDS or equivalent to
the DLC-2.
Retrieve any KOEO and KOER DTCs
2
using WDS or equivalent.
Is any KOEO or KOER DTC
displayed?
3 Is the engine overheating?
Inspect the ignition coil related wiring
harness condition (intermittent open
or short circuit) for all cylinders.
4
Are wiring harness conditions
normal?
Inspect spark plug conditions.
5
Is spark plug wet, covered with
carbon or grayish white?
Visually inspect the CKP sensor and
teeth of crankshaft pulley.
6
Are the CKP sensor and teeth of
crankshaft pulley normal?
Measure the gap between the CKP
sensor and teeth of crankshaft pulley.
Specification
7
0.5-1.9 mm {0.020-0.75 in}
Is the gap within the specification?
8 Remove and shake the PCV valve.
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DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [LF].)
No DTC is displayed:
Go to the next step.
Go to symptom troubleshooting "No.17
Cooling system concerns - Overheating".
(See NO.17 COOLING SYSTEM
CONCERNS-OVERHEATING
Go to the next step.
Go to the next step.
Repair the wiring harnesses
Spark plug is wet or covered with carbon:
Inspect for fuel leakage from fuel injector.
Spark plug is grayish white:
Inspect the fuel injector for clogging.
Install the spark plugs on original cylinders.
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Adjust the CKP sensor.
(See CRANKSHAFT POSITION (CKP)
SENSOR REMOVAL/INSTALLATION
Go to the next step.
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[LF].)
[LF].)