P1859
DTC P1859: Disengagement too late with clutch 1CAUTION:
^ 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 is normal.
DESCRIPTIONS OF MONITOR METHODS
The disengagement of the clutch 1 is determined to be late.
MONITOR EXECUTION
^ Continuous
LOGIC FLOW CHARTS (Monitor Sequence)
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
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 second or more.
^ Clutch 1 (odd) state: Disengaging.
JUDGMENT CRITERIA
^ The disengagement time of the clutch (depends on the fluid temperature) is outside the threshold value.
OBD-II DRIVE CYCLE PATTERN
The disengagement time of the clutch (depends on the fluid temperature) corresponds with the threshold value.
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. P1859 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction.)