Mazda 3 Workshop Manual page 323

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
INSPECT SEALING OF ENGINE COOLANT
PASSAGE
Warning
• Removing the radiator cap when the
radiator is hot is dangerous. Scalding
coolant and steam may shoot out and
cause serious injury.
• When removing the radiator cap,
wrap a thick cloth around and turn it
slowly.
8
• Remove radiator cap.
• Perform procedure to bleed air from the
engine coolant, then run the engine at idle.
• Is there any small bubble, which makes the
engine coolant white at filling opening?
Note
• Large bubbles are normal since
they are remaining air coming out
from the engine coolant passage.
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
9
(See COMPRESSION INSPECTION
• Is it normal?
VERIFY TROUBLESHOOTING OF DTC
P0140 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
• Clear the DTC from the memory using the
10
WDS or equivalent.
• Perform the HO2S heater, HO2S, and TWC
Repair Verification Drive Mode.
(See OBD DRIVE MODE
• Is the PENDING CODE for this DTC
present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
11
(See AFTER REPAIR PROCEDURE
• Are any DTC present?
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Air gets in from poor sealing on head gasket
or other areas between combustion chamber
and engine coolant passage.
Yes
Repair or replace the malfunctioning part,
then go to Step 10.
No Go to the next step.
Yes Go to the next step.
Perform engine overhaul for repairs, then go
No
to the next step.
Replace the PCM, then go to the next step.
Yes
(See PCM REMOVAL/INSTALLATION
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [LF].)
No Troubleshooting completed.
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