Tricking a stock ECU
#1
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Hey guys I've lurked on this forum for a while but finally need help with something and couldn't find the answer after much tedious searching and asking fellow miata owners, so I made an account and an intro post in the meet and great forum. The issue I need help with is, at its simplest, tricking the stock ecu. Here's what I've got going:
I installed an Innovate MTX-L wideband in my car as the first step towards my turbo build. I am still running the stock ecu and replaced the stock pre-cat o2 sensor with the wideband. By hooking up the narrowband output from the Innovate gauge to the factory harness so that the stock ecu gets a signal it can work with. The issue I am experiencing is that the heater circuit for the wideband sensor is controlled through the gauge while the factory o2 heater circuit runs from the harness. This causes the ecu to think that the heater circuit is not working properly. I have since tried splicing in a 6 ohm resistor and a condenser to try and mimic the heater but to no avail. All to say does anyone know of a way to trick the stock ecu into thinking the o2 sensor heater is still in the circuit and working? any help appreciated!
Hey guys I've lurked on this forum for a while but finally need help with something and couldn't find the answer after much tedious searching and asking fellow miata owners, so I made an account and an intro post in the meet and great forum. The issue I need help with is, at its simplest, tricking the stock ecu. Here's what I've got going:
I installed an Innovate MTX-L wideband in my car as the first step towards my turbo build. I am still running the stock ecu and replaced the stock pre-cat o2 sensor with the wideband. By hooking up the narrowband output from the Innovate gauge to the factory harness so that the stock ecu gets a signal it can work with. The issue I am experiencing is that the heater circuit for the wideband sensor is controlled through the gauge while the factory o2 heater circuit runs from the harness. This causes the ecu to think that the heater circuit is not working properly. I have since tried splicing in a 6 ohm resistor and a condenser to try and mimic the heater but to no avail. All to say does anyone know of a way to trick the stock ecu into thinking the o2 sensor heater is still in the circuit and working? any help appreciated!