Will94
Member
Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
User status: Offline
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Hey peepz
If i unplug the EGR, does the ECU run the engine as if the EGR was fine or does it back off power to play it safe?
Also wondering if anyone knows how i can fool it to thinking the EGR is plugged in (so it doesnt go wrong AGAIN)
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Stu_22
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Registered: 25th Mar 02
Location: Luton
User status: Offline
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Its wired through the TPS so may be a bit difficult and I'm sure if it could been done would of been done by now
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Ellis
Member
Registered: 11th Sep 07
Location: Aberdeenshire
User status: Offline
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Ooooh this would be rather handy to know...
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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cant remeber the wiring off the top of my head but its a simple case of measuring the output from the valve back to the ecu and replicating it.
for example, on some cars when we do a decat we need to remove one of the lambda sensors as they give a fault light on the dash without the cat being in. We use an oscilloscope to measure the 'normal' output of that sensor under varying driving conditions on the dyno and that gives us a good idea of the signals that it feeds back to the ecu.
usually this is betwen 0.100 volts and 0.750 volts, continuously switching. its easy to then replicate that feed back to the ecu using an oscilloscope and make up a circuit that will plug into the wiring loom plug for the lambda and trick the ecu to thinking that the sensor is there and working properly.
some circuits of this type are readily available to buy off the shelf.
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Ellis
Member
Registered: 11th Sep 07
Location: Aberdeenshire
User status: Offline
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How would you make a circuit to vary voltage like that?
My electrical knowledge doesn't stretch that far! Haha
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Will94
Member
Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
User status: Offline
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quote:
Originally posted by Dave A
cant remeber the wiring off the top of my head but its a simple case of measuring the output from the valve back to the ecu and replicating it.
for example, on some cars when we do a decat we need to remove one of the lambda sensors as they give a fault light on the dash without the cat being in. We use an oscilloscope to measure the 'normal' output of that sensor under varying driving conditions on the dyno and that gives us a good idea of the signals that it feeds back to the ecu.
usually this is betwen 0.100 volts and 0.750 volts, continuously switching. its easy to then replicate that feed back to the ecu using an oscilloscope and make up a circuit that will plug into the wiring loom plug for the lambda and trick the ecu to thinking that the sensor is there and working properly.
some circuits of this type are readily available to buy off the shelf.
I was thinking something like this, but hoping the circuitry wouldnt be overly complicated to create. Not sure how complicated the EGR is in electrical terms 
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