Fuel Injector - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• PENDING CODE is available if the PCM detects the misfire which affects emission
performance during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
• Spark plug malfunction
• Erratic signal to ignition coil
• Fuel injector malfunction
• Air suction in intake air system (between dynamic chamber and cylinder head)
POSSIBLE
CAUSE
• Inadequate engine compression due to engine internal malfunction
• Related connector or terminal malfunction
• Related wiring harness malfunction
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.
• Is 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 ignition switch is turned
to the ON position and engine idles?
Downloaded from
Yes Go to the next step.
No
Yes
No Go to the next step.
Yes
No Go to the next step.
Yes
[LF].)
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
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. Then go to Step 13.
(See PCM INSPECTION
- automotive repair manuals website
[LF].)