DTC U0046[88] CAN Communication Malfunction (CAN 4 Bus Off) (Central GateWay)

Note

The installed devices vary depending on the vehicle. All the devices that may be connected to the CAN communication circuit are shown in the diagnostic procedure. Perform diagnosis only for the applicable device procedure.

1. Body control system check

Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) diagnostic system check - central gateway controls".

2. Current DTC check

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Observe the DTC information with a scan tool. Is a DTC set?

Yes

=>Go to ECM inspection.

Go to Intermittent conditions of body control system.

Refer to "223.Body Control 36D.Symptom(Central GateWay) intermittent conditions of body control system".

3. ECM inspection

1) Turn OFF the ignition switch.

2) Disconnect the ECM harness connector (C9 for 4JJ3 engine models, C7 for RZ4E engine models).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to Battery sensor inspection.

=>Go to ECM replacement.

4. Battery sensor inspection

1) Turn OFF the ignition switch.

2) Disconnect the battery sensor harness connector (C49).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to Rear differential lock control unit inspection.

=>Go to Battery sensor replacement.

5. Rear differential lock control unit inspection

1) Turn OFF the ignition switch.

2) Disconnect the rear differential lock control unit harness connector (C57).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to TCCM inspection.

=>Go to Rear differential lock control unit replacement.

6. TCCM inspection

1) Turn OFF the ignition switch.

2) Disconnect the TCCM harness connector (C15).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to TCM inspection.

=>Go to TCCM replacement.

7. TCM inspection

1) Turn OFF the ignition switch.

2) Disconnect the TCM harness connector (E7).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to Information module inspection.

=>Go to TCM replacement.

8. Information module inspection

1) Turn OFF the ignition switch.

2) Disconnect the information module harness connector (C105).

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool for DTC U0046[88] being set as a current failure. Is a DTC set?

Yes

=>Go to Powertrain CAN communication circuit inspection.

=>Go to Information module replacement.

9. Powertrain CAN communication circuit inspection

1) Inspect the Powertrain CAN communication circuit for the following. Is the result normal?

Open circuit or high resistance
Short together between circuits
Short to battery or short to ignition power supply circuit
Short to ground

Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Central gateway control unit replacement.

Repair the circuit as necessary.

=>Go to Repair verification.

10. ECM replacement

Note

Perform programming after replacing the ECM.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM setting".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM setting".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM setting".

Procedure completion

=>Go to Repair verification.

11. Battery sensor replacement

Refer to "1.Engine 1J.Electrical(4JJ3 with DPD) battery sensor removal".

Refer to "1.Engine 1J.Electrical(4JJ3 with DPD) battery sensor installation".

Refer to "1.Engine 1J.Electrical(RZ4E-TC) battery sensor removal".

Refer to "1.Engine 1J.Electrical(RZ4E-TC) battery sensor installation".

Procedure completion

=>Go to Repair verification.

12. Rear differential lock control unit replacement

Note

Be sure to perform programming after replacing the rear differential lock control unit.

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit removal".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit installation".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit setting".

Procedure completion

=>Go to Repair verification.

13. TCCM replacement

Note

Perform programming after replacing the TCCM.

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM removal".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM installation".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM setting".

Procedure completion

=>Go to Repair verification.

14. TCM replacement

Note

Perform programming after replacing the TCM.

Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM removal".

Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM installation".

Refer to "5.Transmission, Transaxle 5Z.Transmission Electrical Control(AWR6B45) TCM setting".

Procedure completion

=>Go to Repair verification.

15. Information module replacement

Note

Perform programming after replacing the information module.

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control information module removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control information module installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control information module setting".

Procedure completion

=>Go to Repair verification.

16. Central gateway control unit replacement

Note

Perform programming after replacing the central gateway control unit.

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control central gateway control unit setting".

Procedure completion

=>Go to Repair verification.

17. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool.