Mazda 3 Workshop Manual page 585

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• No restriction of intake-air system
• Proper sealing of intake manifold and
components attached to intake
manifold; such as EGR valve, IAC
valve
• Fuel quality (such as proper octane,
contamination, winter/summer blend)
Are all items normal?
Connect the WDS or equivalent to the
DLC-2.
Retrieve any continuous memory,
KOEO and KOER DTCs using WDS
2
or equivalent.
If engine stall condition exists, retrieve
continuous memory and KOEO DTCs.
Are there any DTCs displayed?
3 Is the engine overheating?
Connect the WDS or equivalent to the
DLC-2.
Access RPM, MAF, TP, IAT and VSS
PIDs.
4
Drive the vehicle while monitoring
PIDs.
Are PIDs within specifications?
(See PCM INSPECTION
Downloaded from
Yes
No
Yes
No
Yes
No
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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.
RPM PID:
Inspect the CKP sensor and related wiring
harness for vibration and/or intermittent
open/short circuit.
MAF PID:
Inspect for intermittent open circuit of MAF
sensor and related wiring harness.
TP PID:
Inspect if TP sensor output increases
smoothly.
IAT PID:
Inspect for air suction in intake-air system.
If normal, inspect intermittent short circuit of
IAT sensor and related wiring harness.
VSS PID:
- automotive repair manuals website
[LF].)