DTC U0126[00] Lost Communication With Steering Angle Sensor Module (Information Module)

1. Information module system check

Refer to "64.Body Control 10I.Troubleshooting(Information Module) diagnostic system check - information module".

2. Programming verification

1) Connect the scan tool.

2) Display the Vehicle Configuration All Data Setting / Change on the scan tool and verify that the equipped ECU information is programmed correctly.

3) If it is not programmed correctly, reprogram the correct value.

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

Procedure completion

=>Go to Current DTC check.

3. Current DTC check

1) Turn OFF the ignition switch.

2) Turn ON the ignition switch and wait for 5 seconds or more.

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

Yes

=>Go to EHCU DTC check.

No

Go to Intermittent conditions of information module.

Refer to "223.Body Control 36D.Symptom(Information Module) Intermittent Conditions of Information Module".

4. EHCU DTC check

1) Observe the DTC information for the EHCU with a scan tool. Is a steering angle sensor-related DTC set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Steering angle sensor voltage inspection.

5. Steering angle sensor voltage inspection

1) Turn OFF the ignition switch.

2) Disconnect the steering angle sensor harness connector (B33).

3) Turn ON the ignition switch.

4) Measure the voltage of the steering angle sensor (pins 4 and 1 of B33) with a DMM. Is the voltage within the specified range?

Value: 10 to 16 V

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

Refer to "LHD Controller Area Network (Except 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 CAN communication circuit inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. CAN communication circuit inspection

1) Inspect the CAN Low circuit and CAN High circuit between the information module (pins 11 and 23 of C105) and the steering angle sensor (pins 2 and 3 of B33) for the following. Is the result normal?

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

Refer to "LHD Controller Area Network (Except 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 Inspection of steering angle sensor harness connector.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. Inspection of steering angle sensor harness connector

1) Inspect for poor connections at the steering angle sensor harness connector (pins 2 and 3 of B33). Is the connection status normal?

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

Refer to "LHD Controller Area Network (Except 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 Information module harness connector inspection.

No

Repair the connections as necessary.

=>Go to Repair verification.

8. Information module harness connector inspection

1) Inspect for poor connections at the information module harness connector (pins 11 and 23 of C105). Is the connection status normal?

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

Refer to "LHD Controller Area Network (Except 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

Replace the steering angle sensor.

Refer to "6.Steering 6Z.Steering Electrical Control steering angle sensor removal".

Refer to "6.Steering 6Z.Steering Electrical Control steering angle sensor installation".

Refer to "6.Steering 6Z.Steering Electrical Control steering angle sensor setting".

=>Go to Current DTC follow-up check.

No

Repair the connections as necessary.

=>Go to Repair verification.

9. Current DTC follow-up check

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

2) Turn ON the ignition switch and wait for 5 seconds or more.

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

Yes

=>Go to Information module replacement.

No

=>Go to Repair verification.

10. Information module replacement

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.

11. Repair verification

1) Turn OFF the ignition switch.

2) Turn ON the ignition switch and wait for 5 seconds or more.

3) Observe the DTC information with a scan tool.