Do you have to extend the wires for the DBW throttle? I layed out the GMPP harness and the wires to the throttle don't look nearly long enough. Are there any vendors that sell an extender harness?
Do you have to extend the wires for the DBW throttle? I layed out the GMPP harness and the wires to the throttle don't look nearly long enough. Are there any vendors that sell an extender harness?
(no risk)
DBW portion of the harness is more than long enough to reach the pedal box, unless you did something weird like putting the ecu at the very rear of the car.
Several business sell dbw extenders, but based on my research from ls1tech I sure wouldn't extend it - it seems to be hit or miss. May work, may trigger a REP error or, worst case, may brick the ECU. Seems the ECU/throttle body is very sensitive and has numerous checks built into it (e.g., making sure pedal and throttle body are matched, resistance of wires) and bad things have the potential to quickly happen when you start getting creative with it.
Btw, you'll probably find you'll need to pre-load the gas pedal with a bolt or similar - there's a dead area in the pedal travel, IIRC the first 10% of the pedal travel has 0% throttle response in the ECU ..... it can tuned out, but there's a chance of bricking the ECU and there's no way to know when it will happen (it may not even happen during tuning, could happen weeks later) ..... basically doing anything different with the gm dbw setup has the potential to brick the ECU, lol.
I had read all the warnings that the DBW was so sensitive that you should only buy a wiring extender from a reputable supplier. Then I spoke to a few who had successfully extended the harness themselves.
The DBW sensor is indeed sensitive, but it also has a safety backup system so it won't allow a runaway throttle situation. Basically, there are 2 position sensors in the throttle unit. These 2 sensors connect independently to the ECM via 2 separate sets of wires. If the ECM detects any difference between the 2 DBW sensors, it automatically puts the motor in a low idle limp mode.
I figured I had nothing to loose by extending the DBW harness myself.
- Wires are wires and I can splice in longer wires as well as anyone
- If it didn't work, I'd end up buying the same extender harness anyway (no risk)
I've had no problem with my extended harness. The sensor sends very little current down the harness so just use good quality copper wire and ensure the wires are all about the same length.