Mitsubishi Lancer Evolution X. Manual — part 576

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-261

DTC P1873: Clutch 1 System (Pressure abnormality)

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnostic trouble code may be
set. Prior to this diagnosis, diagnose the CAN
bus lines.

• Whenever the ECU is replaced, ensure that

the CAN bus lines are normal.

.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the clutch 1 pressure is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The clutch 1 pressure is determined to be abnormal.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of clutch assembly
• Malfunction of engine system

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −

Troubleshooting

P.54C-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Scan tool diagnostic trouble code.
Check the engine diagnostic trouble code. (Refer to GROUP
13A − Troubleshooting

P.13A-48

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 3.

STEP 3. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the
DTC is reset.
Q: Is DTC No.P1873 set?

YES : Replace the clutch assembly. (Refer to GROUP 22D

−transaxle

P.22D-6

.) After replacing the clutch

assembly, go to Step 4.

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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STEP 4. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the
DTC is reset.
Q: Is DTC No.P1873 set?

YES : Replace the mechatronic assembly. (Refer to

P.22C-421

.)

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

DTC P1874: Clutch 2 System (Pressure abnormality)

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnostic trouble code may be
set. Prior to this diagnosis, diagnose the CAN
bus lines.

• Whenever the ECU is replaced, ensure that

the CAN bus lines are normal.

.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the clutch 2 pressure is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The clutch 2 pressure is determined to be abnormal.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of clutch assembly
• Malfunction of engine system

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −

Troubleshooting

P.54C-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Scan tool diagnostic trouble code.
Check the engine diagnostic trouble code. (Refer to GROUP
13A − Troubleshooting

P.13A-48

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 3.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-263

STEP 3. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the
DTC is reset.
Q: Is DTC No.P1874 set?

YES : Replace the clutch assembly. (Refer to GROUP 22D

−Transaxle

P.22D-6

.) After replacing the clutch

assembly, go to Step 4.

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 4. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the
DTC is reset.
Q: Is DTC No.P1874 set?

YES : Replace the mechatronic assembly. (Refer to

P.22C-421

.)

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

DTC P1875: Damper Speed Sensor System (Poor performance)

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnostic trouble code may be
set. Prior to this diagnosis, diagnose the CAN
bus lines.

• Whenever the ECU is replaced, ensure that

the CAN bus lines are normal.

.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the damper (closer to the
engine than input shaft) is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The damper speed sensor is determined to be
abnormal.

.

MONITOR EXECUTION

• Continuous

.

MONITOR EXECUTION CONDITIONS
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• P0715: Input shaft 1 (odd number gear axle)

speed sensor system (Output high range out)

• P0716: Input shaft 1 (odd number gear axle)

speed sensor system (Poor performance)

• P0717: Input shaft 1 (odd number gear axle)

speed sensor system (Output low range out)

• P2766: Input shaft 2 (even number gear axle)

speed sensor system (Poor performance)

Sensor (The sensor below is determined to be

normal)

• Input shaft 1 (odd number gear axle) speed sen-

sor

• Input shaft 2 (even number gear axle) speed sen-

sor

.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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LOGIC FLOW CHARTS (Monitor Sequence)

.

AC710617

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 400 msec

No

Yes

Sensor output speed
> 16,000 r/min