Hey everyone, I know this topic has been pretty hot lately. Sorry to keep it going. Today I bought a 1meg ohm resistor to do the bypass as per a few posts down (Unplugging the det sensor was a major PITA). Reset the ECU by disconnecting the battery for 45mins. Reconnected the ecu and read the codes. 55. YAY!!! Started the car and let idle for around 1 min. All good so far. Switched it off and read the codes again. 34. Dang! Whats going on??? I tried this process again and checked the connections. Still 34. My guess is maybe the det sensor is fine and that it is the wires to the ECU. Any suggestions would be much appreciated. Cheers
To check the ECU wires... using a multimeter set on "ohms" read the resistance across the terminals on the wires going to the ECU. I think the result should be 500ohm or 350 - not sure, but you should get a result. If not, then it is one of the wires going to the ECU that is at fault. Need to find out which by tracing each wire all the way to the ECU. If you get a result then the wiring to the ECU is fine and either the detonation sensor or its wiring is at fault. Usually it is the detonation sensor wiring that suffer more so than the ECU side. If you ever take your plenum off to change the detonation sensor, check the ohms on it. It may still be functional and the wiring may be the problem. Also place the detonation sensor in vinegar overnight and watch it turn brand new. The connectors will be perfect and the only thing you may have to do is a new wiring harness for it. It may save you the cost of approx. $300 for a brand new one. I'd say having some electrical experience or having a friend that's an electrician will help heaps to diagnose the fault. Peter
Check the plugs I've seen many cases where the plugs for the det sensor and VVT solenoid. The det sensor should come from the harness near the centre of the engine and the VVT solenoid comes from the harness on the left side. If they were swapped, you probably put the resistor in the VVT circuit. Swap the plugs over and you might find that the det sensor is OK. See Ya, Garry
All sorted!!!!! Don't laugh but... I had the resistor on the det sensor connection All is good now. No more code 34!!!!!!!! :thumbsup::thumbsup::thumbsup: I have now unleashed power I never new existed Thanks everyone! Very happy now. P.S. Will this now effect my fuel economy for the better? I took it for a fairly hard drive and noticed the fuel gauge had barely moved this time. Usually it'll dip a notch after spirited driving.
Better fuel economy = yes as your ECU is out of safety map now. Don't forget you now have no way of noticing detonation other than the "marbles in a can" sound and by then damage is being done. 'Polite' suggestions = Don't floor or lug it in high gears under 2500-3000RPM, (change down if you need acceleration), ensure it's not overheating and go real easy on the boost and timing unless/until you have a dyno run done and your fuel mixture/boost/AirFuel ratios are all within safe limits :thumbsup:
