Triumph Rocket III Service Manual page 242

Fuel System/Engine Management
2nd Throttle Actuator
Fault Code Possible cause Action
P0638 2nd throttle actuator motor / wiring View & note "freeze frame" data if
fault available.
View
&
note "sensor" data
Ensure actuator connector is
secure.
Disconnect ECM and proceed to
pinpoint testl:
Pinpoint Tests
Test
Result Action
1 Check cable and terminal integrity: OK Proceed to test 2
- ECM pin B21 Faulty Rectify fault, proceed to test 7
- ECM pin B22
- ECM pin B12
- ECM pin B04
2 Check resistance value: 4n to Ion Disconnect actuator and proceed to test 3
- ECM pin B21 to ECM pin B22 Open circuit Proceed to test 4
- ECM pin B12 to ECM pin B04
Short circuit Disconnect actuator and proceed to test 5
3 Check cable continuity: OK Proceed to test 7
- ECM pin B21 to ground
Short circuit Locate and rectify Wiring fault, proceed to test 7
- ECM pin B22 to ground
- ECM pin B12 to ground
- ECM pin B04 to ground
4 Check cable continuity: OK Proceed to test 6
- ECM pin B21 to actuator pin A
- ECM pin B22 to actuator pin A
Open circuit Locate and rectify wiring fault, proceed to test 7
- ECM pin B12 to actuator pin B
- ECM pin B04 to actuator pin B
5
Check cable for short circuit
OK
Proceed to test 6
- ECM pin B21 to ECM pin B22 Short circuit Locate and rectify Wiring fault, proceed to test 7
• ECM pin B12 to ECM pin B04
6 Check actuator resistance:
4n to Ion Proceed to test 7
- Sensor pin A to sensor pin A
- Sensor pin B to sensor pin B
renew actuator and proceed to test 7
7 Reconnect harness, clear fault code. OK Action complete, quit test
Run diagnostic tool function test to visually
verify operation of actuator
Fault still present
Contact Triumph service
11.88
Service Manual - Rocket
III