P0843

DTC P0843: Clutch 1 Pressure Sensor System (Output 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 sensor is normal.

DESCRIPTIONS OF MONITOR METHODS
The output of the clutch 1 pressure sensor 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)
^ P0753: Shift select solenoid 1 system (Open circuit)
^ P0973: Shift select solenoid 1 system (Short to ground)
^ P0974: Shift select solenoid 1 system (Short to power supply)
^ P2733: Clutch/shift switching solenoid 1, spool stuck
^ P2736: Clutch/shift switching solenoid 1 system (Open circuit)
^ P2738: Clutch/shift switching solenoid 1 system (Short to ground)
^ P2739: Clutch/shift switching solenoid 1 system (Short to power supply)
^ P181B: Clutch 1 (Pressure low range out)
^ P181C: Clutch 1 (Pressure high range out)
^ P181E: Clutch 2 (Pressure low range out)
^ P181F Clutch 2 (Pressure high range out)
^ P185D: Clutch open not possible

Sensor (The sensor below is determined to be normal)
^ Shift select solenoid 1
^ Clutch/shift switching solenoid 1

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.

JUDGMENT CRITERIA
^ Sensor voltage: 2.48 V or more. (160 millisecond)

OBD-II DRIVE CYCLE PATTERN
The voltage of the clutch 1 pressure sensor remains 2.48 V or less for 160 milliseconds.

PROBABLE CAUSES
^ Malfunction of TC-SST-ECU
^ Malfunction of clutch 1 pressure sensor

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

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.
1. seconds after turning ON the ignition switch, check that the diagnostic trouble code is reset.
Q: Is DTC No. P0843 set?
YES: Replace the mechatronic assembly.
NO: Intermittent malfunction.