Mazda 3 Workshop Manual page 325

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• PCV valve malfunction
• EGR valve malfunction
• Vacuum hoses damages or improper connection
• Related connector and terminal malfunction
• Related wiring harness malfunction
• Insufficient compression
Diagnostic procedure
STEP INSPECTION
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
• Has FREEZE FRAME DATA been
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
• Verify related service repair information
2
availability.
• Is any related repair information
available?
VERIFY RELATED PENDING CODE
OR STORED DTC
• Turn the ignition switch off, then to the
ON position (Engine off).
3
• Verify related pending code or stored
DTCs.
• Are other DTCs present?
VERIFY CURRENT INPUT SIGNAL
STATUS (KEY TO ON/IDLE)
• Access BOO, ECT, IAT, MAF, RPM,
TP, and VSS PIDs using WDS or
equivalent.
4
(See PCM INSPECTION
• Is there any signal that is far out of
specification when the ignition switch is
turned to the ON position and the engine
idles?
VERIFY CURRENT INPUT SIGNAL
5 STATUS UNDER TROUBLE
CONDITION
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No Go to the next step.
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ACTION
Record the FREEZE FRAME DATA on repair
order, then go to the next step.
Perform repair or diagnosis according to the
available repair information.
• If vehicle is not repaired, go to the next step.
Go to the appropriate DTC troubleshooting.
(See DTC TABLE [LF].)
Inspect suspected circuit and/or part according to
inspection results.
(See PCM INSPECTION
Then go to Step 21.
Inspect suspected circuit and/or part according to
inspection results.
(See PCM INSPECTION
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