Mitsubishi Evolution X. Manual — part 443

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-229

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1875 set?

YES : Replace the TC-SST assembly. (Refer to

P.22C-341

.)

NO : Intermittent malfunction. (Refer to GROUP 00

− How

to Cope with Intermittent Malfunction

P.00-15

.)

DTC P1876: 1st Gear Block

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 gear engagement is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the 1st gear is determined to be
impossible.

.

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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

AC710729

START

No

Good

Malfunction

END

Yes

Yes

Monitoring condition met

No

Gear (synchro) engagement
is 3 times blocked

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-230

DTC SET CONDITIONS

Check Conditions

• Engine speed: 500 r/min or more.

• Time since above engine condition: 400 millisec-

ond or more.

• Target gear: 1st gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked.

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 1st gear is engaged.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST gear

DIAGNOSTIC PROCEDURE

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-14

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1876 set?

YES : Replace the TC-SST assembly. (Refer to

P.22C-341

.)

NO : Intermittent malfunction. (Refer to GROUP 00

− How

to Cope with Intermittent Malfunction

P.00-15

.)

DTC P1877: Gear Block 2nd Gear

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 gear engagement is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the 2nd gear is determined to be
impossible.

.

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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-231

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Engine speed: 500 r/min or more.

• Time since above engine condition: 400 millisec-

ond or more.

• Target gear: 2nd gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked.

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 2nd gear is engaged.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST gear

DIAGNOSTIC PROCEDURE

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-14

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1877 set?

YES : Replace the TC-SST assembly. (Refer to

P.22C-341

.)

NO : Intermittent malfunction. (Refer to GROUP 00

− How

to Cope with Intermittent Malfunction

P.00-15

.)

AC710729

START

No

Good

Malfunction

END

Yes

Yes

Monitoring condition met

No

Gear (synchro) engagement
is 3 times blocked

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-232

DTC P1878: Gear Block 3rd Gear

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 gear engagement is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the 3rd gear is determined to be
impossible.

.

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)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Engine speed: 500 r/min or more.

• Time since above engine condition: 400 millisec-

ond or more.

• Target gear: 3rd gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked.

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 3rd gear is engaged.

.

AC710729

START

No

Good

Malfunction

END

Yes

Yes

Monitoring condition met

No

Gear (synchro) engagement
is 3 times blocked