Triumph Rocket III Service Manual page 232

Fuel System/Engine Management
Cooling Fan Relay
Fault Code Possible cause Action
P1552
Fan relay open circuit, or short View & note diagnostic tool 'sensor'
circuit to ground data.
Ensure fan relay connector is
secure.
Disconnect ECM and proceed to
pinpoint test1:·
P1553 Short circuit to battery+ Disconnect fan relay and proceed
to pinpoint test 4
Pinpoint Tests
Test Result Action
1 Check cable and terminal integrity: OK Disconnect fan relay and proceed to test 2
• ECM pin 810 Faulty Rectify fault, proceed to test 5
2 Check cable for short circuit:
OK
Proceed to test 3
• ECM pin 810 to ground Short circuit Locate and rectify wiring fault, proceed to
test 5
3 Check cable continuity: OK Proceed to test 4
• Fan relay pin 4 to ECM pin 810 Open circuit
Locate and rectify wiring fault, proceed to
- Fan relay pin 6 to EMS relay pin 8
test 5
4 Check cable for short circuit: OK Proceed to test 5
- ECM pin 810 to 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 cooling fan
Fault still present Contact Triumph service
Circuit Diagram
EMS Relay
Fuse Box
Fuse6
Cooling Fan Relay
P.-+"'='-':-,-+I,
ECM
LBY-J:l
L-----------iNK-t:j
11.78
Service Manual - Rocket
III