G6M0088
2) Carbon fouled
Dry fluffy carbon deposits on insulator and electrode are
mostly caused by slow speed driving in city, weak ignition,
too rich fuel mixture, dirty air cleaner, etc.
It is advisable to replace with plugs having hotter heat
range.
G6M0089
3) Oil fouled
Wet black deposits show excessive oil entrance into com-
bustion chamber through worn rings and pistons or exces-
sive clearance between valve guides and stems. If same
condition remains after repair, use a hotter plug.
G6M0090
4) Overheating
White or light gray insulator with black or gray brown spots
and bluish burnt electrodes indicate engine overheating.
Moreover, the appearance results from incorrect ignition
timing, loose spark plugs, wrong selection of fuel, hotter
range plug, etc. It is advisable to replace with plugs having
colder heat range.
G6M0091
C: CLEANING AND REGAPPING
Clean spark plugs in a sand blast type cleaner.
Avoid excessive blasting. Clean and remove carbon or
oxide deposits, but do not wear away porcelain.
If deposits are too stubborn, discard plugs.
After cleaning spark plugs, recondition firing surface of
electrodes with file. Then correct the spark plug gap using
a gap gauge.
Spark plug gap: L
1.0—1.1 mm (0.039—0.043 in)
D: REMOVAL AND INSTALLATION (2500 cc
EXCEPT OUTBACK MODEL)
CAUTION:
All spark plugs installed on an engine, must be of the
same heat range.
Spark plug:
NGK: PFR5B-11
24
6-1SERVICE PROCEDURE
3. Spark Plug
10AI5
ONLY ONE CYLINDER
: Is there a fault in that cylinder?
NOTE:
Check the following items.
Spark plug
Spark plug cord
Fuel injector
Compression ratio
: Repair or replace faulty parts.
: Go to step10AI11.
10AI6
GROUP OF #1 AND #2 CYLINDERS
: Are there faults in #1 and #2 cylinders?
NOTE:
Check the following items.
Spark plugs
Fuel injectors
Ignition coil
If no abnormal is discovered, check for“D: IGNITION
CONTROL SYSTEM”of #1 and #2 cylinders side.
2-7 [T8D0].>
: Repair or replace faulty parts.
: Go to step10AI11.
216
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
10AI7
GROUP OF #3 AND #4 CYLINDERS
: Are there faults in #3 and #4 cylinders?
NOTE:
Check the following items.
Spark plugs
Fuel injectors
Ignition coil
If no abnormal is discovered, check for“D: IGNITION
CONTROL SYSTEM”of #3 and #4 cylinders side.
2-7 [T8D0].>
: Repair or replace faulty parts.
: Go to step10AI11.
10AI8
GROUP OF #1 AND #3 CYLINDERS
: Are there faults in #1 and #3 cylinders?
NOTE:
Check the following items.
Spark plugs
Fuel injectors
Skipping timing belt teeth
: Repair or replace faulty parts.
: Go to step10AI11.
217
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
10AI9
GROUP OF #2 AND #4 CYLINDERS
: Are there faults in #2 and #4 cylinders?
NOTE:
Check the following items.
Spark plugs
Fuel injectors
Skipping timing belt teeth
: Repair or replace faulty parts.
: Go to step10AI11.
10AI10
THE CYLINDER AT RANDOM
: Is the engine idle rough?
: Go to step10AI11.
: Go to DTC P0170.
and [T10T5].>
B2M0759
10AI11
CHECK EGR SYSTEM.
: Is the minimum EGR system pressure value
(value of function mode (F42) less than 1
kPa?
NOTE:
Use the value read in step10X2for function mode F42.
: Clean EGR valve.
CAUTION:
Do not use solvent when cleaning EGR valve
assembly, as it can damage diaphragm.
NOTE:
Remove and blow away the exhaust deposits. Make
sure the valve operates smoothly and the valve seat area
is completely cleaned.
Replace EGR valve as required.
: Go to DTC P0170.
and [T10T5].>
218
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles
