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Have you verified that you still have a standing 5 V at the sensor wires feeding the signal back to the ECU after grounding the sensor ground wires directly to the battery (-) post, with a "VOLT" meter, engine running?
Have you checked the sensor ground wires at the sensor with an "OHM" meter?
IF the sensors are indeed well grounded (needs to be less than 1 ohm), I would look for a ground issue at the ECU sensor ground "AT THE ECU".
If the sensor voltages now vary, like .7 to 4.7 V on the TPS from Idle to WOT, power on, engine off, I would suspect the scanner or the port wires the scanner is attached to are the problem!!!!
The port wire connections on my 87 Renix do not read properly on many of the wires anymore, that is why I do all my testing with a "MULTI Meter" (ohms and volts, LOL, how is that Old_Man????:wave1: LOL)
Renix does NOT like .2 V on the sensor ground wires, needs be a max of about .02 volts on Renix.
Have you checked the sensor ground wires at the sensor with an "OHM" meter?
IF the sensors are indeed well grounded (needs to be less than 1 ohm), I would look for a ground issue at the ECU sensor ground "AT THE ECU".
If the sensor voltages now vary, like .7 to 4.7 V on the TPS from Idle to WOT, power on, engine off, I would suspect the scanner or the port wires the scanner is attached to are the problem!!!!
The port wire connections on my 87 Renix do not read properly on many of the wires anymore, that is why I do all my testing with a "MULTI Meter" (ohms and volts, LOL, how is that Old_Man????:wave1: LOL)
Renix does NOT like .2 V on the sensor ground wires, needs be a max of about .02 volts on Renix.