Triumph Rocket III Classic Service Manual page 310

Fuel System/Engine Management
Tachometer - Rocket III and Classic
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Fault Code Possible cause Action
P0654 Tachometer system fault View & note 'freeze frame' data if
available.
View & note 'sensor' data.
Ensure instrument connector is secure.
Disconnect ECM and proceed to
pinpoint test 1:-
Pinpoint Tests
Test Result Action
1 Check cable and terminal integrity: OK
Disconnect instrument and proceed to test 2
- ECM pin B14
Faulty Rectify fault, proceed to test 5
(
2 Check cable for short circuit: OK Proceed to test 3
- ECM pin B 14 to ground
Short circuit Locate and rectify wiring fault, proceed to test
5
3 Check cable continuity: OK
Proceed to test 4
- Instrument pin 1 to ECM pin B 14 Open circuit Locate and rectify wiring fault, proceed to test
- Instrument pin 10 to earth
5
- Instrument pin 2 to alarm control
unit pinl
4 Check cable for short circuit: OK Renew instruments, proceed to test 5
- ECM pin B 14 to ECM pin A20 Short circuit Locate and rectify wiring fault, proceed to test
5
5 Reconnect harness, clear fault code and run OK Action complete - quit test
diagnostic tool function test to visually verify
operation of tachometer
Fault still present Contact Triumph service
1U06
SelVice Manual - Rocket Ill/ Classic / Touring