U0028

88

CAN 1 Bus Off

Make sure the diagnostic tool is using the latest software version.

Update all ECM software.

Clear fault code and retest.

If fault is still present contact Triumph Service.

U0037

88

CAN 2 Bus Off

1

Check cable and terminal integrity:

- Engine ECM - Connector C pin 1

- Engine ECM - Connector C pin 6

- Instrument pin 3

- Instrument pin 2

- Positive battery ring terminal

- Negative battery ring terminal

- Diagnostic connector pin 6

- Diagnostic connector pin 14

OK

Proceed to test 2

Faulty

Rectify fault, proceed to test 5

2

Check cable for short circuit:

- Instruments pin 3 to battery negative and positive ring terminals

- Instruments pin 2 to battery negative and positive ring terminals

OK

Proceed to test 3

Short Circuit

Locate and rectify wiring fault, proceed to test 5

3

Check cable continuity:

- Engine ECM - Connector C pin 1 to instrument pin 3

- Engine ECM - Connector C pin 6 to instrument pin 2

OK

Proceed to test 4

Open circuit

Rectify wiring fault, proceed to test 5

4

Check CAN bus resistance:

- Diagnostic connector pin 6 to diagnostic connector pin 14

OK (60 Ohms +/- 1 Ohms)

Proceed to test 5

Faulty

Note measured resistance, Diagnostic Trouble Codes and contract Triumph Service

5

Reconnect harness, clear fault code and run engine to verify fault cleared.

OK

Action complete - quit test

Fault still present

Contact Triumph service