Mazda 3 Workshop Manual page 331

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
VERIFY CURRENT INPUT SIGNAL
STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as in Step 4 while
5 simulating FREEZE FRAME DATA
condition.
• Is there any signal which causes drastic
changes?
INSPECT SPARK PLUG CONDITION
• Turn the ignition switch off.
• Remove spark plug from suspected
cylinder.
• Inspect spark plug condition:
6
- Cracks
- Excess wear
- Gap
- Wet
• Is any problem found on spark plug?
INSPECT IGNITION COIL WIRING
HARNESSES
• Inspect the ignition coil related wiring
7
harness condition (intermittent open or
short circuit) for all cylinders.
• Are wiring harness conditions normal?
INSPECT FOR AIR SUCTION AT
INTAKE-AIR SYSTEM
• Inspect for air leakage at following:
- Around connection of dynamic
8
chamber and intake manifold
- Around connection of intake
manifold and cylinder head
• Is air leakage found?
INSPECT FUEL INJECTOR WIRING
HARNESS
• Remove intake air system parts.
• Disconnect the fuel injector connector on
suspected cylinder.
9
• Connect NOID LIGHT to fuel injector
terminals.
• Inspect dim of light during cranking.
• Does noid light illuminate?
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Yes
No Go to the next step.
Yes
No Go to the next step.
Yes Go to the next step.
No
Yes
No Go to the next step.
Yes Go to the next step.
No
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Inspect suspected circuit and/or part according
to inspection results. Then go to Step 13.
(See PCM INSPECTION
• If spark plug is wet, fuel flooding is suspected.
Go to step 13.
• If spark plug has a cracks, excessive wear or
improper gap, replace the malfunctioning spark
plug. Then go to Step 13.
Repair the wiring harnesses, then go to Step
13.
Repair or replace suspected part, then go to
Step 13.
Inspect for fuel injector wiring harnesses.
Repair or replace it if necessary, then go to
Step 13.
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