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DTC P1873: Clutch 1 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 1 pressure is normal.

DESCRIPTIONS OF MONITOR METHODS


The clutch 1 pressure is determined to be abnormal.

PROBABLE CAUSES



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?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) After repairing the CAN bus line, go to Step 2.

STEP 2. Scan tool diagnostic trouble code.
Check the engine diagnostic trouble code. (Refer to GROUP 13A - Troubleshooting .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
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.P1873 set?
Replace the transaxle assembly. (Refer to .)
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)