P1890

DTC P1890 TEACH-IN NOT COMPLETED

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 Teach-In is completed normally.

DESCRIPTIONS OF MONITOR METHODS
It is judged that Teach-In is not completed normally.

PROBABLE CAUSES
^ Teach-In not completed
^ Malfunction of TC-SST-ECU
^ Malfunction of clutch assembly

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) Erase the DTC.
2) After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.
Q: Is DTC No. P1890 set?
YES: Go to Step 3.
NO: Intermittent malfunction.

STEP 3. Scan tool Teach-in
1) Perform Teach-In (the same item as the mechatronic assembly replacement). TC-SST Teach-In
2) After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.
Q: Is DTC No. P1890 set?
YES: Go to Step 4.
NO: This diagnosis is complete.

STEP 4. Replace the mechatronic assembly, and check if the DTC is reset.
1) Replace the mechatronic assembly.
2) After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.
Q: Is DTC No. P1890 set?
YES: Go to Step 5.
NO: This diagnosis is complete.

STEP 5. Replace the clutch assembly, and check if the DTC is reset.
1) Replace the clutch assembly.
2) After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.
Q: Is DTC No. P1890 set?
YES: Replace the transaxle assembly.
NO: This diagnosis is complete.