Mitsubishi Evolution X. Manual - part 170

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-11

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. Set the timing light to the power supply line (terminal No. 4)

of the ignition coil No. 1.

4. Start the engine and run it at idle.
5. Check that the idle speed is approximately 700 r/min.
6. Select scan tool MB991958 actuator test "item number 11".
7. Check that basic ignition timing is within the standard value.

Standard value: 5

° BTDC ± 3°

8. If the basic ignition timing is not within the standard value,

refer to GROUP 13A, Multiport Fuel Injection (MFI)

−

Multiport Fuel Injection (MFI) Diagnosis

− Symptom Chart

P.13A-48

CAUTION

If the actuator test is not canceled, the forced drive will
continue for 27 minutes. Driving in this state could lead to
engine failure.
9. Cancel the setting mode of the scan tool MB991958.
10.Check that the actual ignition timing is at the standard value.

Standard value: Approximately 10

° BTDC

NOTE: Ignition timing fluctuates about

Before Top Dead

Center, even under normal operating condition.
NOTE: It is automatically further advanced by about 5

Before Top Dead Center at higher altitudes.

NOTE: Wait till approximately 1 minute passes after the
engine started, and check the ignition timing when the
engine stabilized.

11.Remove the timing light.

AC608435

Data link connector

MB991827

MB991824

MB991910

AK703277

Power supply line
(terminal No. 4)

Equipment side
connector

No. 1 ignition coil

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-12

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.
12.Disconnect scan tool MB991958 from the data link

connector.

CURB IDLE SPEED CHECK

M1111003502069

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.

CAUTION

AC608435

Data link connector

MB991827

MB991824

MB991910

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-13

3. Set the timing light to the power supply line (terminal No. 4)

of the ignition coil No. 1.

4. Start the engine.
5. Run the engine at idle for 2 minutes.
6. Check the actual ignition timing is at the standard value.

Standard value: Approximately 10

° BTDC

NOTE: Ignition timing fluctuates about

, even under nor-

mal operating condition.
NOTE: It is automatically further advanced by about 5

from

Before Top Dead Center at higher altitudes.

NOTE: Wait till approximately 1 minute passes after the
engine started, and check the ignition timing when the
engine stabilized.

7. Check the idle speed. Select item number 2 and take a

reading of the idle speed.

Curb idle speed: 700

± 100 r/min

NOTE: The idle speed is controlled automatically by the idle
air control system.

8. If the idle speed is outside the standard value, refer to

GROUP 13A, Multiport Fuel Injection (MFI)

− Multiport Fuel

Injection (MFI) Diagnosis

− Symptom Chart

P.13A-48

9. Remove the timing light.

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.
10.Disconnect scan tool MB991958 from the data link

connector.

IDLE MIXTURE CHECK

M1111002101441

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.

AK703277

Power supply line
(terminal No. 4)

Equipment side
connector

No. 1 ignition coil

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-14

CAUTION

3. Set the timing light to the power supply line (terminal No. 4)

of the ignition coil No. 1.

4. Start the engine and let it run at idle.
5. Check that the actual ignition timing is at the standard value.

Standard value: Approximately 10

° BTDC

NOTE: Ignition timing fluctuates about

, even under nor-

mal operating condition.
NOTE: It is automatically further advanced by about 5

from

Before Top Dead Center at higher altitudes.

NOTE: Wait till approximately 1 minute passes after the
engine started, and check the ignition timing when the
engine stabilized.

6. Run the engine and increase the engine speed to 2,500

r/min for 2 minutes.

7. Set the CO, HC tester.
8. Check the CO contents and the HC contents at idle.

Standard value:

CO contents: 0.5% or less
HC contents: 100 ppm or less

9. If there is a deviation from the standard value, inspect the

MFI system (Refer to GROUP 13A

− Multiport Fuel Injection

(MFI)

− Multiport Fuel Injection (MFI) Diagnosis − Symptom

Chart

P.13A-48

)

10.Remove the timing light.

AC608435

Data link connector

MB991827

MB991824

MB991910

AK703277

Power supply line
(terminal No. 4)

Equipment side
connector

No. 1 ignition coil

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