P1874

DTC P1874: Clutch 2 System (Pressure 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 clutch 2 pressure is normal.

DESCRIPTIONS OF MONITOR METHODS
The clutch 2 pressure is determined to be abnormal.

PROBABLE CAUSES
^ Malfunction of TC-SST-ECU
^ Malfunction of clutch assembly
^ Malfunction of engine system

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. Scan tool diagnostic trouble code.
Check the engine diagnostic trouble code. Diagnostic Trouble Code Descriptions
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.

STEP 3. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the DTC is reset.
Q: Is DTC No. P1874 set?
YES: Replace the clutch assembly. After replacing the clutch assembly, go to Step 4.
NO: Intermittent malfunction.

STEP 4. Check whether the DTC is reset.
After 30 seconds with the engine idle status, check that the DTC is reset.
Q: Is DTC No. P1874 set?
YES: Replace the mechatronic assembly.
NO: Intermittent malfunction.