Mazda 6 2002, Workshop Manual

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F–126
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0327
A6E397001085W03
10 INSPECT SEALING OF ENGINE COOLANT
PASSAGE
Warning
•
Removing radiator cap when radiator is
hot is dangerous, Scalding coolant and
steam may shoot out and cause serious
injury.
•
When removing radiator cap, wrap thick
cloth around and turn it slowly.
•
Remove radiator cap.
•
Implement procedure to bleed air from engine
coolant, then run engine at idle.
•
Is there any small bubble which makes engine
coolant white at filling opening?
Note
•
Large bubbles are normal since they are
remaining air coming out from engine
coolant passage.
Yes Air gets in from poor sealing on head gasket or other areas
between combustion chamber and engine coolant
passage. Repair or replace faulty parts, then go to Step 12.
No Go to next step.
11 INSPECT ENGINE COMPRESSION
•
Inspect engine compression.
(See
B–9 COMPRESSION INSPECTION .)
•
Is engine compression okay?
Yes Go to next step.
No Overhaul the engine, then go to next step.
12 INSPECT FUEL INJECTOR OPERATION
•
Remove fuel injector from suspected cylinder.
•
Swap injector with injector on other cylinder.
•
Start engine and run it at idle.
•
Is misfire DTC for cylinder which has a
suspected fuel injector?
Yes Replace injector, then go to step 13.
No Go to next step.
13 VERIFY TROUBLESHOOTING OF MISFIRE DTC
COMPLETED
•
Make sure to reconnect all disconnected
connectors.
•
Start engine.
•
Clear DTC from PCM memory using WDS or
equivalent.
•
Run PCM adaptive memory procedure drive
mode.
(See
F–64 OBD DRIVE MODE .)
•
Is same PENDING CODE or stored code the
same as DTC present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION .)
No Go to next step.
14 VERIFY AFTER REPAIR PROCEDURE
•
Perform “After Repair Procedure”.
(See
F–66 AFTER REPAIR PROCEDURE .)
•
Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE .)
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0327 Knock sensor circuit low input
DETECTION
CONDITION
•
PCM monitors input signal from knock sensor when engine is running. If input voltage at PCM terminals
between 2P and 2S is
below 0.9 V , PCM determines that knock sensor circuit has malfunction.
Diagnostic support note
•
This is a continuous monitor (CCM).
•
MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
•
PENDING CODE is available if PCM detects the above malfunction condition.
•
FREEZE FRAME DATA is available.
•
DTC is stored in the PCM memory.
POSSIBLE
CAUSE
•
Knock sensor malfunction
•
Connector or terminal malfunction
•
Open or short to ground circuit between knock sensor connector terminal A and PCM terminal 2S
•
Open or short to ground circuit between knock sensor connector terminal B and PCM terminal 2P
•
Short knock sensor two wires