Mazda 3 Workshop Manual page 464

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Connect the WDS equivalent to the DLC-2
and retrieve DTC.
Are any of following DTCs displayed?
5
DTC
B1213, B1600, B1601, B1602, B1681,
B2103, B2139, B2141, B2431, U2510
Inspect for the following wiring harnesses
and connectors:
• Between coil terminal A and instrument
cluster terminal 2Q
6
• Between coil terminal B and instrument
cluster terminal 2S
Is there any malfunction?
Inspect for the following wiring harnesses
and connectors:
• Between PCM terminal 1W and
instrument cluster terminal 1O
7
• Between PCM terminal 1S and instrument
cluster terminal 1M
Is there any malfunction?
Verify the following:
• Vacuum connection
• External fuel shut off or accessory (such
as kill switch, alarm etc.)
• Fuel quality: proper octane,
contamination, winter/summer blend
• No air leakage from intake-air system
• Intake-air system restriction (such as air
8
cleaner element, fresh air dust)
• Proper sealing of the intake manifold and
components attached to intake manifold:
IAC valve, EGR valve
• Ignition wiring
• Electrical connections
• Fuses
• Smooth operation of throttle valve
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Inspect the instrument cluster and wiring
harness.
(See INSTRUMENT CLUSTER
INSPECTION.)
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
Go to the next step.
Repair or replace the suspected wiring
harness and connector.
Go to the next step.
Repair or replace the suspected wiring
harness and connector.
Go to the next step.
Go to the next step.
Service if necessary.
Repeat Step 8.
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