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2.0L HDI 2004 Bosch ECU.
Do these ECUs have a permanent battery supply? ie. battery voltage with ignition off, key out.
With a battery voltage of 12.41 Volts and using a high resistance DVM with the ECU not connected (off the vehicle) and the ignition key out. I have the following:
Plug .1. Blue Plug. One of the connections reads 11.86 Volts
Plug .2. Middle Plug. One of the connections reads 12.02 Volts.
Plug .3. Blue Plug (Thick Wires) No voltage detected.
Is this as it should be and where do these less than battery voltages come from.
Tony.
Last edited by Tony Jones (2019-11-25 00:16:59)
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Those voltages are probably just battery voltage with some resistance factored in (long wires, corroded connections)
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I don't see how they are due to resistance with no load applied, the DVM has such a high internal resistance that it would still show the battery voltage through a wet piece of string.
If it ever stops raining I will repeat the test with some load applied and see how the voltage falls.
The wires with this voltage appearing on them are very thin and I don't know how they are protected against over current and or short circuit.
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