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Ecu voltage no start

Old Jan 18, 2026 | 01:08 PM
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Rencb112's Avatar
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Default Ecu voltage no start

Hi I have td5 no power to ecu only 2.022v from fuse 1 in the engine bay put voltmeter to ecu and exactly the same voltage.


Earths are all find from ecu if I used jumper cable from main live to fuse 1 in the engine bay fuse box truck will start and run but trying to diagnose low voltage to ecu.

nano come will not connect to ecu because of voltage

battery voltage 12v everywhere else

thanks
 
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Old Jan 18, 2026 | 05:07 PM
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Rencb112's Avatar
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Default Update.

Update. Narrowed it down to now earth output from ecu to r9

Ecu works fine in other truck.

temperature gauge not working continuously overheating light.
 
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