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Found 1 result

  1. So I inherited a 85 brat with a ej 22 conversion. After many hours and several small repairs including a idle air control cleaning I am having a problem with the tps. I started tracing wires back to the ecu and found a problem with the tps power and signal wires. The information I have found on the internet claims pin 58-2 to be the signal wire. white wire at the tps sensor however it is black at the ecu and was clearly grounded in a harness which appeared to be factoryish. The opposite was true for the ground wire, black at the tps and the b58-1 pin has a white wire. My next step was to make a bypass harness for the tps/idle four wire set up. I grounded pin 58.1 and ran a wire back to the tps black wire (position 4). The red wire voltage seems good at 4.7 volts (position 3) I left it alone. I connected a wire to pin 58-2 and ran it back to the white wire (position 2) on the tps. Which leads me to the problem I am having now. Set up like this it seems to run well with the exception of a high idle. Good throttle response anyhow. So I turned my attention to the idle switch wire, brown and on pin 56-6 (position 1) on the tps. I reads a constant 4.7 volts. The voltage originates from the ecu and not the tps. Removing the plug from the computer and testing pin 56-6 I get 4.7 volts. So my question is. should there be voltage at the idle switch and the tps works by grounding it out when the throttle is closed? Or am I getting some kind of feedback through the ecm because of the shotty harness install? Is there something else hooked to the idle circuit that might be causing this? Is the info I have on the ecu pinout incorrect? Just chasing my tail at this point. Please help.
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