Triumph Rocket III Service Manual page 233

Tachometer
Fuel System/Engine Management
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
- ECM pin 814
2
Faulty Rectify fault, proceed to test 5
2 Check cable for short circuit
OK Proceed to test 3
- ECM pin 814to 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 814
Open circuit Locate and rectify wiring fault, proceed to
- Instrument pin 10 to earth
test 5
- Instrument pin 2 to alarm control
unit pin1
4 Check cable for short circuit OK Renew instruments, proceed to test 5
- ECM pin 814to ECM pin A20
Short circuit Locate and rectify wiring fault, proceed to
test 5
5 Reconnect harness, clear fault code and OK Action complete - quit test
run diagnostic tool function test to
visually verify operation of tachometer
Fault still present Contact Triumph service
Circuit Diagram
~
Fuse Box
Instruments
J
LGN
FuseS
G
c=::::J
GR
KM
R 814
10
'It:
A06
BOB
Bog
Service Manual - Rocket III
11.79