Ohjai Posted June 13, 2023 Share Posted June 13, 2023 (edited) My 91 with 76,000 miles shows 5 MPH while standing still. When I start to move it indicates the proper sped. It appears to be accurate. With this reading I am unable to perform the Injector Balance Test because the car need to be stationary. This appears to be from the instrument panel, the engine data shows 0 MPH. Any Ideas? Thanks Jim Edited June 13, 2023 by Ohjai Link to comment Share on other sites More sharing options...
2seater Posted June 13, 2023 Share Posted June 13, 2023 Hmm, I know nothing about the Tech1 but is there a zero button or anything like that to essentially do a reset to start a session? I have seen that with some other sensors or indicators where the key on supplies potential on the circuit and I imagine it is some sort of electronic noise or feedback causing this. I just looked at my 90 and key on, and engine running, or not, it displays zero. Even though the displays look similar the 91 has a different ECM. Something new every day but no help😖 1 Link to comment Share on other sites More sharing options...
Ohjai Posted June 14, 2023 Topic Author Share Posted June 14, 2023 What is interesting is the Instrument reading is 5 MPH but the output from the Engine module is 0 (zero). As soon as the car starts to move the speedo approaches toward zero and starts reading the actual speed. I have been looking all over for the spot where I can zero that value, but I am beginning to think it is a parameter on the EEPROM. I'm not sure I have the skill set or equipment to tackle that. At one time I would have, I worked on all sorts of communication - navigation and electronic systems, but my eyes, memory, and steadiness of hand are not what they once were. 1 Link to comment Share on other sites More sharing options...
Recommended Posts