U1434

DTC U1434: Failure information on TPMS-ECU

CAUTION:

- If DTC U1434 is set in the combination meter, diagnose the CAN main bus line.
- If DTC U1434 has been set, SWS related DTC 021 is also set. After SWS has been diagnosed, don't forget to erase DTC 021.

DTC SET CONDITION

The combination meter communicates with the TPMS-ECU (TPMS receiver) via CAN bus line. If failure information is sent to the combination meter, DTC U1434 will be set.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

- The TPMS-ECU (TPMS receiver) or the combination meter may be defective.
Past trouble

- Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the TPMS-ECU (TPMS receiver) and the combination meter. For diagnosis procedures, refer to "How to cope with past trouble" How to Cope With Intermittent Malfunctions ).

TROUBLESHOOTING HINTS

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- Malfunction of TPMS-ECU (TPMS receiver)
- Malfunction of combination meter

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 to diagnose the CAN bus lines.





(1)
CAUTION:
To prevent damage to scan tool (MB991958), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (MB991958).

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result satisfactory?

YES Go to Step 2.

NO Repair the CAN bus lines CAN Bus Diagnostics Chart).

STEP 2. Using scan tool MB991958, read the TPMS diagnostic trouble code.

Check if an TPMS diagnostic trouble code is set.





(1)Turn the ignition switch to "ON" position.
(2)Read the diagnostic trouble code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the TPMS by referring to Diagnosis - Diagnostic Trouble Code Chart Tire Pressure Monitoring System (TPMS).

NO Go to Step 3.

STEP 3. Recheck for diagnostic trouble code.

Check that the diagnostic trouble code is not reset.





(1)Turn the ignition switch to "ON" position.
(2)Erase the diagnostic trouble code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to "ON" position.
(5)Read the diagnostic trouble code.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normally?

YES The procedure is complete.

NO Replace the combination meter.