HFS-3 on BMW 535d - waterinjection.info

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HFS-3 on BMW 535d

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05-08-2017, 07:09 AM

Richard L

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Join Date: Oct 2003

Location: England

Posts: 4,941

Re: HFS-3 on BMW 535d

if you are using the fuel injector signal on the green wire of the grey harness, you need to modify the underside of the circuit board to detect PWM (+). Cut and solder.
Also link the MPS.

Post a picture of your ECU so I can confirm the correct wiring.

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Richard L
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