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Mitsubishi Lancer Evolution X. Manual - part 546

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-141

LOGIC FLOW CHARTS (Monitor Sequence)

DTC SET CONDITIONS

Check Conditions

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.
• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds

or more.

• Input shaft 1 (odd) speed: 500 r/min or more.
• Input shaft 2 (even) speed: 500 r/min or more.
• Shift fork 1 position: Neutral.
• Input shaft 2 (even) gear: Engaged.
• Engine speed − input shaft 2 speed: 50 r/min or

less.

JUDGMENT CRITERIA

• Calculated speed: 40 r/min or less. (500 millisec-

ond)

OBD-II DRIVE CYCLE PATTERN

The calculated speed remains 40 r/min or more for
500 millisecond.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of shift fork position sensor 1

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

AC711383

START

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 500 msec

Yes

Calculated input
shaft speed

Calculated input shaft
speed <= 40 r/min

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-142

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. Check whether the DTC is reset.
After driving in the 3rd gear, check that the DTC is reset.
Q: Is DTC No.P1823 set?

YES : Go to Step 3.
NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

STEP 3. Scan tool diagnostic trouble code for other
systems
Check if a shift fork and shift fork position sensor-related diag-
nostic trouble code No. other than P1823 is stored.
Q: Is the DTC set?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Scan tool Teach-In
(1) Carry out the Item No. 1: Plausibility check. (Refer to

Special Function (Teach-In Reference Table

P.22C-365

).)

(2) After Teach-In, check which result ("Yes" or "No") is

displayed in the Data list No. 101: Normal End. (Refer to
Special Function (Teach-In Reference Table

P.22C-365

).)

Q: Which is displayed, "Yes" or "No"?

"Yes" : Replace the transaxle assembly. (Refer to

P.22C-412

"No" : Go to Step 5.

STEP 5. Replace the mechatronic assembly, and check if
the DTC is reset.
After driving in the 3rd gear, check that the DTC is reset.
Q: Is DTC No.P1823 set?

YES : Replace the transaxle assembly. (Refer to

P.22C-412

NO : This diagnosis is complete.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-143

DTC P1824: Shift Fork Position Sensor 1 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 shift fork position sen-
sor 1 is normal.

DESCRIPTIONS OF MONITOR METHODS

The shift fork position sensor 1 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)

• P1820: Shift fork position sensor 1 system (Volt-

age low range out)

• P1821: Shift fork position sensor 1 system (Volt-

age high range out)

• P1822: Shift fork position sensor 1 system (Out-

put range out)

• P1823: Shift fork position sensor 1 system (Neu-

tral)

• P1836: Shift fork 1 malfunction
• P1852: Shift fork 1 or 2 opposite direction move-

ment

• P1855: Shift fork 3 or 4 opposite direction move-

ment

• P1857: Odd number gear axle interlock
• P1876: Gear block 1st
• P1877: Gear block 2nd
• P1878: Gear block 3rd
• P1879: Gear block 4th
• P187A: Gear block 5th
• P187B: Gear block 6th
• P187C: Gear block reverse

Sensor (The sensor below is determined to be

normal)

• Not applicable

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-144

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 1 current gear: 1st gear>

DTC SET CONDITIONS <SHIFT FORK 1
CURRENT GEAR: 1ST GEAR>

Check Conditions

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.
• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds

or more.

• Input shaft 1 (odd) speed: 500 r/min or more.
• Shift fork 1 current gear: 1st gear.

• Clutch 1 (odd) transmit torque: 40 N⋅ m (30 ft-lb)

or more.

• Requested shift fork: Not shift fork 1.

JUDGMENT CRITERIA

• Shift fork 1 position: 6 mm (0.24 inch) or less.

(250 millisecond)

OBD-II DRIVE CYCLE PATTERN <SHIFT
FORK 1 CURRENT GEAR: 1ST GEAR>

The travel distance of the shift fork 1 remains 6 mm
(0.24 inch) or more for 250 millisecond.

AC710682

START

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 250 msec

Yes

Shift fork position
< 6 mm (0.24 inch)

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