This will allow the GM ECM to receive the TOSS signal from the Compushift controller. The purple/white (VSS TOSS Hi) will be matched up to the purple/white “speedo out” in the picture shown earlier. Nearly all the current GM harnesses will use a combo of purple/white (VSS TOSS Hi) and light green/black(VSS TOSS Lo) wires for the speed signal connector.
#O2J SPEED SENSOR WIRING HOW TO#
Now that we’ve covered how to correctly connect the Compushift we still have to feed the reproduced speed signal into the GM ECM. The later model GM 4L70E and Ford 4R75W transmissions will also use an input and output speed sensor set up, however, the GM 4L70E input sensor is internal rather than external like the 4L80E. This can give you an early detection of problems with clutch slippage internally before a catastrophic failure occurs.
#O2J SPEED SENSOR WIRING CODE#
If there is too much of a variance between the 2 signals in any given gear it will produce an error code to be checked. output speed in each gear relative to each other and has a specific amount of variance built in. It uses a calculation based on incoming RPM vs. The Compushift is able to read both input and output speeds to help determine if there are any issues within the transmission. Pictured below is an example of a 4L80E with both input (TISS) and output (TOSS) speed sensors. If you happen to mix these up you will know right away during the first test drive when the transmission refuses to shift or shows an erratic speed signal. Most of the early electronic transmissions only use the TOSS and the TISS connector remains unplugged and tucked out of the way. It’s important to also remember that not every transmission will utilize the TISS which is the input speed coming from the engine RPM, the TOSS is the actual output speed of the transmission or what we want to see on the dash speedometer. The connectors in the Compushift harness labeled TISS and TOSS (pictured below) will be what is connected directly to the transmission speed sensors. The Compushift will give us a way to feed the signal into the GM ECM via the “speedo out” wire included in the harness (pictured below) In this case the Compushift controller will be what is operating the transmission and will require it’s harness to be connected to the speed sensors of the transmission leaving the GM connector with no place to plug into.
#O2J SPEED SENSOR WIRING MANUAL#
The harness for the GM ECM will still have vehicle speed inputs in case you would be using it with a manual transmission that doesn’t require a control module, but that connector cannot be directly plugged into the transmission. In this instance we’re using an aftermarket transmission controller with a GM ECM that only controls the engine functions. The HGM electronics Compushift Sport 3 along with a GM ECM. We’ll start with an example that we use here quite often. However, if you have purchased an engine only controller, and intend on using it with a manual transmission or stand alone automatic transmission controller, there will be some alternate ways to make these connections. Both of these systems can be bought with an integrated transmission control module for an automatic transmission, and in those scenarios, there’s nothing special you need to do other than plug it directly into the transmission speed sensor, set up your transmission programming and off you go. The GM controller and the Holley Terminator & Dominator systems.
There’s several different types and styles of engine control modules (ECM) available in the market today, but we’ll touch on the 2 most common that we see used. We’ll try to break it down and give you an overview of the most common applications we come across to help save you a little time and effort in your wiring adventures. The car building hobby and industry has been continually embracing more electronic controls into use, and with the popularity of fuel injection and digital/electronic dashes there can be some confusion as to the best way to get the speedometer signal from the transmission to the ECM and then to the actual speedometer.
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