P0777

DTC P0777: Clutch Cooling Flow Solenoid System (Stuck)

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 cooling flow solenoid is normal.

DESCRIPTIONS OF MONITOR METHODS
The clutch cooling flow solenoid is determined to be seized.

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)
^ P0776: Clutch cooling flow solenoid system (Drive current range out)
^ P0964: Clutch cooling flow solenoid system (Open circuit)
^ P0965: Clutch cooling flow solenoid system (Overvoltage)
^ P0966: Clutch cooling flow solenoid system (Short to ground)
^ P0967: Clutch cooling flow solenoid system (Short to power supply)

Sensor (The sensor below is determined to be normal)
^ Not applicable

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: 500 r/min or more.
^ Time since above engine condition: 400 millisecond or more.
^ Clutch 1 target pressure: 380 mbar or more.
^ Clutch 2 target pressure: 380 mbar or more.

JUDGMENT CRITERIA
^ Clutch 1 pressure: 100 mbar or less, and clutch 2 pressure: 100 mbar or less. (3 seconds)

OBD-II DRIVE CYCLE PATTERN
The Clutch 1 pressure and clutch 2 pressure remain 100 mbar or more for 3 seconds.

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. P0777 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.