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GU 3.0 starting issue

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So this one has me beat. 

3.0 zd30 patrol, will not start off key. 

Fuel pressure all good battery volts good. 

Car will bump start first time every time and run fine. 

Ignition on starter solenoid bridged to rule out key switch still no start. 

Thought maybe lazy so replaced.. turns over a lot quicker but refuses to start off key .. 

Thoughts ? 

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Just check that engine ECU is staying alive during cranking process, it does sounds like 'DR' circuit is dropping hence if engine is turned on without starter motor it fires up. Could possibly be ECU ground/earth issue.


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