B2240

DTC B2240: Communication error with CAN Box

CAUTION:

- If DTC B2240 is set, be sure to diagnose the CAN bus line.
- When replacing the CAN box unit or multivision display, always check that the communication circuit is normal. (Check that the voltage is 10 V or more.)










TECHNICAL DESCRIPTION (COMMENT)

When the abnormality occurs in the transmission/reception data between the CAN box unit and multivision display, the CAN box unit sets DTC B2240.

TROUBLESHOOTING HINTS

- multivision display malfunction
- CAN box unit malfunction
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- 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 (Vehicles with CAN communication system)

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





(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. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES Go to Step 2.

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

STEP 2. Perform "Network/Connect Line Check" of the MMCS service mode.

Perform "Network/Connect Line Check" of the MMCS service mode, and check that the communication between the CAN box unit and the multivision display is normal. (Refer to Without Manufacture's Scan Tool (Service Mode).)

OK: "CAN BOX OK" is displayed.


NOTE:
When the communication between the multivision display and the CAN box unit is not possible, "CAN BOX" is not displayed.

Q. Is "CAN BOX OK" displayed?

YES Go to Step 5.
NO Go to Step 3.
STEP 3. Check CAN box unit connector C-108 and multivision display connector C-12 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are CAN box unit connector C-108 and multivision display connector C-12 in good condition?

YES Go to Step 4.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 4. Check the wiring harness between CAN box unit connector C-108 (terminal 5, 4, 6) and multivision display connector C-12 (terminal 43, 59, 58).

- Check the communication lines for open circuit and short circuit.

Q. Is the wiring harness between CAN box unit connector C-108 (terminal 5, 4, 6) and multivision display connector C-12 (terminal 43, 59, 58) in good condition?

YES Go to Step 5.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set to the CAN box unit.

(1)Erase the DTC.

(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.

(3)Check if DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Go to Step 6.
NO The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 6. Recheck for diagnostic trouble code.

Temporarily replace the multivision display, and check if the DTC is set to the CAN box unit.

(1)Erase the DTC.

(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.

(3)Check if DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Replace the CAN box unit.
NO Replace the multivision display.