P1872
DTC P1872: Between shift lever and TC-SST system (Q-A function abnormality)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 lever-ECU is normal.
DESCRIPTIONS OF MONITOR METHODS
The shift lever-ECU 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)
^ 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)
^ P0846: Clutch 2 pressure sensor system (Poor performance)
^ P0847: Clutch 2 pressure sensor system (Output low range out)
^ P0848: Clutch 2 pressure sensor system (Output high range out)
^ P185D: Clutch open not possible U0001: Bus off U0100: Engine time-out error
^ P1803: Shift lever system (CAN or LIN time-out error)
^ P1870: Engine torque signal abnormality P1871: APS system (Signal abnormality)
Sensor (The sensor below is determined to be normal)
^ Clutch 1 pressure sensor
^ Clutch 2 pressure sensor
^ APS
^ Shift lever-ECU
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.
^ Time after TC-SST-ECU start: 5 seconds or more.
JUDGMENT CRITERIA
^ Communication algorithm: Undesigned signal.
OBD-II DRIVE CYCLE PATTERN
The communication algorithm is normal.
PROBABLE CAUSES
^ Malfunction of the shift lever-ECU
^ 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. Scan tool diagnostic trouble code
Check the shift lever diagnostic trouble code.
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.
STEP 3. Replace the shift lever assembly, and check if the diagnostic trouble code is reset.
1) Replace the shift lever assembly.
2) Check the DTC
Q: Is DTC No. P1872 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.