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FJR Motorcycle Forums
Technical & Mechanical Problems
Bike fires and starts then immediately dies.
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<blockquote data-quote="ionbeam" data-source="post: 806517" data-attributes="member: 277"><p>All of the symptoms you list from the diagnostic test are consistent with the the Fuel Injection Relay not being turned on by the ECU. You say that with normal key operation the fuel relay turns on, are you sure it is the fuel relay and not another relay? Do you hear the fuel pump turn on and run for 3-5 seconds when you turn the key on? Are you able to test the fuel pressure on the fuel rail?</p><p></p><p>It is troubling that you can't turn on the Fuel Injection Relay via the diagnostic procedure, this indicates that the ECU can't turn the relay on for some reason. It does fit the symptoms when:</p><p></p><p>-- the fuel pump runs when the key is turned on</p><p></p><p>-- fuel is then delivered to the fuel rail</p><p></p><p>-- the motorcycle starts and consumes the fuel in the fuel rail</p><p></p><p>-- the ECU can not turn on the Fuel Injection Relay so after the fuel in the rail is consumed the engine dies</p><p></p><p>This is why I ask if you can test or monitor fuel pressure on the fuel rail.</p><p></p><p>Did you find any errors stored in memory when you ran the diagnostics?</p></blockquote><p></p>
[QUOTE="ionbeam, post: 806517, member: 277"] All of the symptoms you list from the diagnostic test are consistent with the the Fuel Injection Relay not being turned on by the ECU. You say that with normal key operation the fuel relay turns on, are you sure it is the fuel relay and not another relay? Do you hear the fuel pump turn on and run for 3-5 seconds when you turn the key on? Are you able to test the fuel pressure on the fuel rail? It is troubling that you can't turn on the Fuel Injection Relay via the diagnostic procedure, this indicates that the ECU can't turn the relay on for some reason. It does fit the symptoms when: -- the fuel pump runs when the key is turned on -- fuel is then delivered to the fuel rail -- the motorcycle starts and consumes the fuel in the fuel rail -- the ECU can not turn on the Fuel Injection Relay so after the fuel in the rail is consumed the engine dies This is why I ask if you can test or monitor fuel pressure on the fuel rail. Did you find any errors stored in memory when you ran the diagnostics? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Bike fires and starts then immediately dies.
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