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You can't bypass it the ecm works by monitoring variations from sensors all over the engine your best possible solution is to repair the wires that were cut
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All Toyota engines utilize one of the most sophisticated vehicle Immobilizer systems on the market. There is no known way to bypass these systems. What this means, is that even if you somehow successfully installed a used D-4D engine into your vehicle, the ECU would be locked and not allow the engine to run as the ECU needs to be programmed to your specific vehicle. It's a common misconception that simply having a key from the donor vehicle is a method of bypassing this programmer. All Toyota D-4D ECU's use volatile memory chips for their immobilizers which means that if the battery power is cut to the ECU for any considerable length of time, the ECU will have to be re-programmed.
If u mean bypass as in putting a new wire in, I'd be in plugging the Ecu connector and lambda sensor then running a simple test to make sure u got the right wire , a four wire lambda is 2 heater wires usually the same colour which when on is positive 1 5v Ecu feed and a earth
There is only one way to bypass security. There is a wire that has to be cut, while the engine is running. This puts the ECU in default mode and will start and run the car. After the security is set, it is to late. You will have to have it scanned for codes and have it fixed. EVEN aftermarket stuff doesn't bypass it. It just sends a signal for the ECU to read.
There is no easy way to bypass the immobilizer on this car without switching to a red label ecu and cutting wires OR having your ecu reprogrammed without the immobilizer. A better question is why are you doing this? If you are switching ECUs, you can usually have a new EWS module programmed for $75-100.
If you have had the dreaded spinning key and are planning on switching columns, you can usually drill and pin/screw the tumbler in less than 30 minutes and avoid the hassle all together. The other option is to swap key/module/immobilizer module all at once.
If you have already swapped the column, keep your old key and decoder ring, tape them together, and stick them up under the plastic of your new column - problem solved.
As you can see, the answer starts with a different question - what are you trying to accomplish.
all BMW 3series come with a factory fitted imobiliser, it can be bypassed under the dash near steering wheel, (usually purple wires) but i advise you seek an auto electrician to do it for you as any mistake can blow the ECU (brain for the car) rendering it useless without replacing the ECU and they are not cheap (but also generally not too expensive either)
When contacting the AUTO ELECTRICIAN, tell them that the imobiliser has gave up the goat (most auto electricians should be familliar with the bmw's imobiliser problem, as its a common fault) tell them that you want it bypassing, or removed completely (they will charge for this service) it also maybe an idea to have your log book handy and some form of I.D as most electricians will not disable an imobiliser without proof of ownership or proof of person (i dont need to state why, as this is obvious)
if this doesnt solve your problem, there is a fault with the chip inside the key, or it maybe that the ECU isnt reading the chip!
If you are looking for a method of preventing the vehicle from being stolen, a better approach is to cut off the ignition supply to the engine management unit or ECU..
Use a circuit diagram of the ECU wiring to determine the ignition feed or feeds and then use a relay to interrupt those feeds. You can switch the relay using a hidden switch or through a vehicle alarm or anti theft device. Disconnecting the starter can be defeated under the hood by shorting the starter solenoid but cutting the power to the ECU cannot easily be bypassed.
One word of warning though, DO NOT cut any wires unless you are 100% certain that the wires you are cutting are the correct ones because you can cause the ECU to set fault codes in its memory which can seriously affect the driveability of the vehicle. If you have any doubts, consult a qualified person..
wiring harness can be over $2k, the labour is high. i would question the reasoning behind this. i lost a wring harness on a 99M3 because the ECU blew, because the ecu gets wet on bmw and malfunctions...
on your car i dont' know. check the condition of the ecu and see if is has corroded because water is getting into the compartment.
TW: i got a $2500 wiring harness on ebay for $50 and a replacement ecu for $100
cost me $500 in labour and another tow to bmw and $100 for them to program the new cu to my ignition key. from BMW, yes this would be pricy.
security systems simply get between the key and the engine. The wire that is your engine run circuit is cut and and rerouted through the alarm module. Find this alarm module, find the two wires that have the same color code that are spliced into the two wires off the nodule. At this point, Do'nt cut them, jump them to each other and see if it will start. Alarm systems work on the time,pressure theory. In truth , the alarn wiring is stpid and simple. The secret is to put pressure on the thief by limiting the time he has to locate the wiring and bypass it by making alot of noise and flashing lights. Take your time and you can find and figure out which wires were cut and soliced into the module. If you have any questions, let me know.@ [email protected].
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