Mazda 3 Workshop Manual page 317

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
INSPECT GAS LEAKAGE FROM
EXHAUST SYSTEM
• Visually inspect if the re is any gas
7
leakage between the exhaust manifold and
front HO2S.
• Is there gas leakage?
INSPECT SEALING OF ENGINE
COOLANT PASSAGE
• Perform the ENGINE COOLANT
8
LEAKAGE INSPECTION. (See
COOLANT LEAKAGE
• Is there any malfunction?
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
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(See COMPRESSION INSPECTION
• Is it normal?
VERIFY TROUBLESHOOTING OF DTC
P0134 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position
(Engine off).
• Clear the DTC from 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".
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(See AFTER REPAIR PROCEDURE
• Are any DTC present?
Downloaded from
Yes
No
Yes
ENGINE
INSPECTION.)
No Go to the next step.
Yes Go to the next step.
[LF].)
No
Yes
No Go to the next step.
[LF].)
Yes
[LF].)
No Troubleshooting completed.
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Repair or replace any malfunctioning exhaust
part, then go to Step 10.
• Inspect the following harnesses for open
circuit or short to ground, repair or replace
wiring harness if necessary.
- Front HO2S terminal A (wiring
harness-side) to PCM terminal 2AG
(wiring harness-side)
• Repair or replace wiring harness if
necessary.
• If all items above are normal, replace
malfunctioning sensor.
Then go to Step 10.
Repair or replace the malfunctioning part
according to inspection results, then go to Step
10.
Perform engine overhaul for repairs, then go to
the next step.
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF].)
- automotive repair manuals website
[LF].)