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DTC P1802: Shift Lever System (LIN communication malfunction)










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 CAN back-up communication (LIN) is normal.

DESCRIPTIONS OF MONITOR METHODS


The CAN back-up communication 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 shift lever diagnostic trouble code. (Refer to .)

Q. Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 3.

STEP 3. Inspection of the TC-SST-ECU connector, intermediate connector, and shift lever-ECU connector: B-107, A-13, C-27
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the wiring harness between B-107 TC-SST-ECU connector terminal No. 17 and C-27 shift lever-ECU connector terminal No. 16.
Check the communication line for open and short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. Check whether the DTC is reset.
10 seconds after turning ON the ignition switch, check that the DTC is reset.

Q. Is DTC No. P1802 set?
Go to Step 6.
This diagnosis is complete.

STEP 6. Replace the shift lever assembly, and check if the diagnostic trouble code is reset.
(1)Replace the shift lever assembly. (Refer to .)
(2)Check the DTC.
(3)After 10 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.

Q. Is DTC No. P1802 set?
Replace the transaxle assembly. (Refer to .)
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)