Inspection Procedure 5

Inspection Procedure 5: Communication between the Scan Tool and the TPMS is not Possible.

CIRCUIT OPERATION

The TPMS receiver is linked to the data link connector via CAN bus line to communicate with the scan tool.

TECHNICAL DESCRIPTION (COMMENT)

If the system does not communicate with scan tool, power supply to data link connector or CAN bus lines may be defective.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)

- Malfunction of the TPMS receiver

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

DIAGNOSIS

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. 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. Check that the TPMS receiver communicates with the scan tool.

(1)Turn the ignition switch to "ON" position.
(2)Check if scan tool MB991958 can communicate with the TPMS receiver.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result satisfactory?

YES The procedure is complete.

NO Replace the TPMS receiver, and execute "Tire Pressure Sensor ID Registration"
on scan tool MB991958 "Special Function" (Refer to Tire Pressure Sensor ID Registration). Then go to Step 3.

STEP 3. Check that the TPMS receiver communicates with the scan tool.