Mitsubishi Evolution X. Manual — part 171
ON-VEHICLE SERVICE
TSB Revision
ENGINE MECHANICAL
11A-15
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
11.Disconnect scan tool MB991958 from the data link
connector.
COMPRESSION PRESSURE CHECK
M1111002602278
Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
1. Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle in the following
condition:
• Engine coolant temperature: 80 − 95° C (176 − 203° F)
• Lights and all accessories: OFF
• Transaxle: Neutral (P range on vehicles with TC-SST)
NOTE: On vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.
2. Remove all of the ignition coils and spark plugs.
3. Disconnect the all of the injector connectors.
WARNING
Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.
4. Cover the spark plug hole with a shop towel etc., after the
engine has been cranked, check that no foreign material is
adhering to the shop towel.
5. Set compression gauge to one of the spark plug holes.
6. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 200 r/min): 1,090
kPa (158 psi)
Limit (at engine speed of 200 r/min): Minimum 650
kPa (95 psi)
7. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: Maximum 100 kPa (14 psi)
8. If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount of
engine oil through the spark plug hole, and repeat the
operations in steps from 5 to 7.
AK502603AE
Injector
connectors
AK502604AE
Compression gauge
ON-VEHICLE SERVICE
TSB Revision
ENGINE MECHANICAL
11A-16
(1) If the compression increases after oil is added, the cause
of the malfunction is a worn or damaged piston ring
and/or cylinder inner surface.
(2) If the compression does not rise after oil is added, the
cause is a burnt or defective valve seat, or pressure is
leaking from the gasket.
9. Connect the all of the injector connector.
10.Install the spark plugs and ignition coils.
11.Use the scan tool MB991958 to erase the diagnosis codes.
NOTE: This will erase the diagnosis code resulting from the
injector connectors being disconnected.
MANIFOLD VACUUM CHECK
M1111002701711
Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
1. Before inspection, set the vehicle in the following condition:
• Engine coolant temperature: 80 − 95° C (176 − 203° F)
• Lights and all accessories: OFF
• Transaxle: Neutral (P range on vehicles with TC-SST)
NOTE: On vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
ON-VEHICLE SERVICE
TSB Revision
ENGINE MECHANICAL
11A-17
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
2. Connect scan tool MB991958 to the data link connector.
3. Disconnect the ventilation hose from the positive crankcase
ventilation (PCV) valve, and then connect a vacuum gauge
to the ventilation hose. Plug the PCV valve.
4. Start the engine and check that idle speed is approximately
700 r/min.
5. Check the intake manifold vacuum.
Limit: Minimum 60 kPa (18 in Hg)
6. Turn off the ignition switch.
7. Remove the vacuum gauge and then connect the ventilation
hose to the PCV valve.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
8. Disconnect scan tool MB991958 from the data link
connector.
TIMING CHAIN ELONGATION VISUAL CHECK
M1111005200024
NOTE: When the timing chain elongates more than the speci-
fied length, the diagnosis code No. P0012, variable valve tim-
ing (VVT) advanced-angle value abnormal, is output. Unless
the diagnosis code No. P0012, therefore, is output, the visual
check is unnecessary.
NOTE: Unless the work using the following scan tool
MB991958 is correctly carried out due to the malfunction of
ECM, carry out the check whether or not the diagnosis code
exists.
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AK502601AE
Plug
PCV valve
Vacuum gauge
ON-VEHICLE SERVICE
TSB Revision
ENGINE MECHANICAL
11A-18
•
Storing the learning value regarding the amount of timing
chain elongation before the ECM replacement
•
Writing the learning value into the new ECM after the ECM
replacement
1. Remove all the ignition coils.
2. Remove the cylinder head cover.
3. Remove the upper chain guide.
CAUTION
Always rotate the crankshaft clockwise.
4. Rotating the crankshaft clockwise, align the timing mark of
camshaft sprocket with the point on the upper plane of
cylinder head shown in the illustration. As a result of this, the
No.1 cylinder is positioned at the compression TDC.
5. Look at the inside of timing chain case with one eye in the
direction of arrow shown in the illustration. Fix the eye line at
the point where the top axis line of the chain elongation
indicator at the front side of timing chain case is overlapped
with that of the chain elongation indicator at the reverse side
of timing chain case.
AK604565
Timing mark
AF
Timing chain case
AK703387AC
Visual line (visual axis)
Chain elongation
indicator
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