Triumph Rocket III Classic Service Manual page 314

Fuel System/Engine Management
Vehicle Speed Output - Rocket III and Classic
Fault Code Possible cause Action
P1500 Vehicle Speed Circuit Fault
View
8.
note 'freeze frame' data if
available.
View
8.
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 instruments and proceed to test 2
- ECM pin B32
- ECM pin B08
- ECM pin B09
- ECM pin A06
Faulty Rectify fault, proceed to test 5
2 Check cable for short circuit: OK Proceed to test 3
- ECM pin B32 to ground Short circuit
Locate and rectify wiring fault, proceed to test
5
3 Check cable continuity:
OK Proceed to test 4
- Instrument pin 13 to ECM pin 832 Open circuit Locate and redify wiring fault, proceed to test
- Instrument pin 10 to ground
5
- Instrument pin 2 to alarm control
unit pin 1
4 Check cable for short circuit: OK Renew instruments, proceed to test 5
ECM pin A20 to ECM pin B32 Short circuit Locate and rectify wiring fault, proceed to test
5
5 Reconned harness, clear fault code and run OK Adion complete - quit test
(
diagnostic tool function test to visually verify
operation of speedometer.
Fault still present Contact Triumph service
11.110
Service Manual - Rocket III / Classic / Touring