![]() ![]() Using oscilloscope: 5 Vp-p (including DC offset)Ģ500 12ms 83.3 Hz Shifter Neutral Position Switch: Here is what I found: Engine RPM Sensor Output I figured doing this would help validate the information in the manual and also give me more specific information (more specific information being waveform frequency vs. After finding the preliminary data on these signals (see the excerpts from the maintenance manual), I decided it would be smart to find these wires going into the ECM and make some measurements of my own. The first place I went to find information about these signals was the maintenance manual for my car. The signals that would become inputs to my system included: Because of the requirements I had drawn up, I knew I needed to understand the inner workings of the signals that are sent to my car's engine control module (ECM). Now that the basic requirements were set in place, it was time to collect the necessary data from my car's engine and ignition systems. (Note: This is to prevent the vehicle from running out of gas if the user forgets that it was started.) (Note: This is to prevent theft and also to eliminate the possibility of the engine shutting off due to a failure in this remote start system.)ĩ) After starting, the engine shall automatically shut down after 30 minutes of operation. Here are the requirements that I set for my system before getting started:ġ) The remote start system shall appear transparent to (not affect the operation of) the the vehicle's starting/operating system.Ģ) Functionality of the key-start shall be available at all times.ģ) After starting, the engine shall remain operational regardless of Bluetooth connectivity.Ĥ) After turning off, the engine shall remain off regardless of Bluetooth connectivity.ĥ) The engine shall start only while the shifter is in the neutral position.Ħ) The engine shall only start if the engine is not currently running.ħ) The starter shall be disengaged after the engine reaches idle RPM or after 4 seconds have passed, whichever comes first.Ĩ) The engine shall turn off if the vehicle is moving and the key is not in the ignition. Because I started this project from scratch, I needed some guidelines before I started to design the system. ![]()
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