P181C

DTC P181C: Clutch 1 (Pressure high 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 clutch 1 pressure is normal.

DESCRIPTIONS OF MONITOR METHODS
The pressure of the clutch 1 is too high.

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)
^ P0841: Clutch 1 pressure sensor system (Poor performance)
^ P0842: Clutch 1 pressure sensor system (Output low range out)
^ P0843: Clutch 1 pressure sensor system (Output high range out)
^ P1836: Shift fork 1 malfunction
^ P183D: Shift fork 2 malfunction

Sensor (The sensor below is determined to be normal)
^ Clutch 1 pressure sensor

LOGIC FLOW CHARTS (Monitor Sequence)

[Target clutch 1 (odd) pressure: 3,000 mbar or more]





DTC SET CONDITIONS [TARGET

CLUTCH 1 (ODD) PRESSURE: 3,000 MBAR OR MORE]

Check Conditions
^ Engine speed: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Clutch 1 (odd) state: Slip or engaged.
^ Target clutch 1 (odd) pressure: 3,000 mbar or more.

JUDGMENT CRITERIA
Calculated pressure: -5,000 mbar or less. (220 millisecond)

OBD-II DRIVE CYCLE PATTERN [TARGET CLUTCH 1 (ODD) PRESSURE: 3,000 MBAR OR MORE]
The calculated pressure remains -5,000 mbar or more for 220 milliseconds.

LOGIC FLOW CHARTS (Monitor Sequence)

[Target clutch 1 (odd) pressure: 1,400 mbar or more to 3,000 mbar or less]





DTC SET CONDITIONS [TARGET CLUTCH 1 (ODD) PRESSURE: 1,400 MBAR OR MORE TO 3,000 MBAR OR LESS]

Check Conditions
^ Engine speed: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Clutch 1 (odd) state: Slip or engaged.
^ Target clutch 1 (odd) pressure: 1,400 mbar or more.

JUDGMENT CRITERIA
Calculated pressure: -2,000 mbar or less. (220 millisecond)

OBD-II DRIVE CYCLE PATTERN [TARGET CLUTCH 1 (ODD) PRESSURE: 1,400 MBAR OR MORE TO 3,000 MBAR OR LESS]
The calculated pressure remains -2,000 mbar or more for 220 milliseconds.

LOGIC FLOW CHARTS (Monitor Sequence)

[Target clutch 1 (odd) pressure: 1,400 mbar or less]





DTC SET CONDITIONS [TARGET CLUTCH 1 (ODD) PRESSURE: 1,400 MBAR OR LESS]

Check Conditions
^ Engine speed: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Clutch 1 (odd) state: Slip or engaged.
^ Target clutch 1 (odd) pressure: 1,400 mbar or less.

JUDGMENT CRITERIA
Calculated pressure: 4,000 mbar or less. (220 millisecond)

OBD-II DRIVE CYCLE PATTERN [TARGET CLUTCH 1 (ODD) PRESSURE: 1,400 MBAR OR LESS]
The clutch 1 (odd) pressure remains 4,000 mbar or more for 220 milliseconds.

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. After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q: Is DTC No. P181C set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.