Cooling fan relay — pinpoint tests (Triumph Rocket III)

Fault Code	Possible cause	Action
P1552	Fan relay open circuit, or short circuit to ground	View & note diagnostic tool "sensor" data. Ensure fan relay connector is secure. Disconnect ECM and proceed to pinpoint test 1
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: - ECM pin B10	OK	Disconnect fan relay and proceed to test 2
1 Check cable and terminal integrity: - ECM pin B10	Faulty	Rectify fault, proceed to test 5
2 Check cable for short circuit: - ECM pin B10 to ground	OK	Proceed to test 3
2 Check cable for short circuit: - ECM pin B10 to ground	Short circuit	Locate and rectify wiring fault, proceed to test 5
3 Check cable continuity: - Fan relay pin 4 to ECM pin B10 - Fan relay pin 6 to EMS relay pin 8	OK	Proceed to test 4
	Open circuit	Locate and rectify wiring fault, proceed to test 5
4 Check cable for short circuit: - ECM pin B10 to ECM pin A20	OK	Proceed to test 5
	Short circuit	Locate and rectify wiring fault, proceed to test 5
5 Reconnect harness, clear fault code and run diagnostic tool function test to visually verify operation of cooling fan	OK	Action complete - quit test
	Fault still present	Contact Triumph service

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This article has been reviewed: Serafim Sazonov

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