I
UMI
MPH
FUEL SYSTEM/ENGINE MANAGEMENT 9
PURGE VALVE
Fault Code
Possible cause
Action
PO443
Purge valve system fault
View & note diagnostic tool `sensor' data.
Ensure purge valve connector is secure.
Disconnect ECM and proceed to pinpoint
test 1
PO444
Open circuit or short circuit to earth
PO445
Short circuit to battery+
disconnect purge valve and proceed to
pinpoint test 5
Pinpoint Tests
Test
Result
Action
1
Check cable and terminal integrity:
— ECM pin 26
OK
Proceed to test 2
Faulty
Rectify fault, proceed to test 7
2
Check resistance value:
— ECM pin 1 to ECM pin 26
26Q
Disconnect purge valve and proceed to test
3
Open circuit
Proceed to test 4
Short circuit
Disconnect purge valve and proceed to test
5
3
Check cable for short circuit:
— ECM pin 26 to earth
OK
Proceed to test 7
Short circuit
Locate and rectify wiring fault, proceed to
test 7
4
Check cable continuity:
— ECM pin 26 to valve pin 1
— ECM pin 1 to valve pin 2
OK
Proceed to test 6
Open circuit
Locate and rectify wiring fault, proceed to
test 7
5
Check cable for short circuit:
— ECM pin 1 to ECM pin 26
OK
Proceed to test 6
Short circuit
Locate and rectify wiring fault, proceed to
test 7
6
Check purge valve resistance:
- Valve pin 1 to valve pin 2
2652
Proceed to test 7
Faulty
Renew purge valve, proceed to test 7
7
Reconnect harness, clear fault code and
run diagnostic tool function test to visually
verify operation of purge valve
OK
Action complete — quit test
Fault
Contact Triumph service
Circuit Diagram
ECM Main
Power Relay
Fusebox
Valve
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Y
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N
-I
Engine Control
Module
9.63