Mitsubishi Evolution X. Manual - part 394

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-33

DTC P0746: Line Pressure Solenoid System (Drive current range out)

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 line pressure solenoid 
is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The difference between the actual current of the line 
pressure solenoid and target current is large.

.

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)

• P0960: Line pressure solenoid system (Open cir-

cuit)

• P0961: Line pressure solenoid system (Overvolt-

age)

• P0962: Line pressure solenoid system (Short to 

ground)

• P0963: Line pressure solenoid system (Short to 

power supply)

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - high>

.

DTC SET CONDITIONS

Check Conditions <Rationality-high>

• Voltage of battery: 8 V or more.

• Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA <Rationality-high>

• Calculated current (actual current − target cur-

rent): 500 mA or more. (1 second)

AC710625

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 1 sec

No

Yes

Calculated current > 500 mA

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-34

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-HIGH>

The value of the calculated current (actual current 

− 

target current) remains 500 mA or less for 1 second.

.

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - low>

.

DTC SET CONDITIONS

Check Conditions <Rationality-low>

• Voltage of battery: 8 V or more.

• Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA <Rationality-low>

• Calculated current (target current − actual cur-

rent): 500 mA or more. (12 seconds)

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-LOW>

The value of the calculated current (target current 

− 

actual current) remains 500 mA or less for 12 sec-
onds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

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.

AC710626

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 12 sec

No

Yes

Calculated current > 500 mA

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-35

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P0746 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 P0753: Shift Select Solenoid 1 System (Open circuit)

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 shift select solenoid 1 
circuit is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift select solenoid 1 circuit is determined to be 
open.

.

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)

AC710622

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 1 sec

No

Yes

FET* output > 1 V

*FET : Field Effect Transistor

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-36

.

DTC SET CONDITIONS

Check Conditions

• Voltage of battery: 8 V or more.

• Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA

• FET (Field Effect Transistor) output: 1 V or more. 

(1 second)

.

OBD-II DRIVE CYCLE PATTERN

The FET channel output remains 1 V or less for 1 
second.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

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. P0753 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 P0758: Shift Select Solenoid 2 System (Open circuit)

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 shift select solenoid 2 
circuit is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift select solenoid 2 circuit is determined to be 
open.

.

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

.