91GVR4
Well-known member
Okey here is the story. I discoved last week that my O2 sensor voltage was jumping around alot and causeing the ECU to dump fuel. So I figure the O2 sensor was bad and picked up a new one.
Today I started to change it out when I noticed that the wires going into the plug were cracked and that all the wires around there were in bad shape. So I get out my sidecutters, strippers, cripper, ect. and spend a few hours patching up cracked wires on my thermostat sensors. While I was doing this I noticed some clicking from the relays under the hood. I thought that was strange because I didn't think any of the wires I was working on had power when the car was off.
Anyway I get the wires all fixed up and deside to start the car and see if my O2 voltage problem was just bad wires. Well the car won't start! It sputtered a few times, but mostly just cranked. So I look at my logger again and notice that the TPS is reading 100% and doesn't respond throttle inputs. Great! So I pull out the multimeter and test the TPS. Pin 1-4 4.5k ohms, pin 2-4 .8k ohms to 2.5k ohms as you open the trottle. Those values are good according to my manual. Now I am thinking I have more wiring problems. Next I go into the car and pull the 24 pin plug from the ECU. I check the resistance from the TPS and it is the same as when I check it at the sensor. Now I am guessing it is an ECU problem.
The only other thing I can think of is that the ECU reads voltage (not resistance) thru the TPS. So has anyone had a TPS that tested good, but when hooked up to voltage was bad?
Thanks for reading this and any sugestions you have are welcome.
Today I started to change it out when I noticed that the wires going into the plug were cracked and that all the wires around there were in bad shape. So I get out my sidecutters, strippers, cripper, ect. and spend a few hours patching up cracked wires on my thermostat sensors. While I was doing this I noticed some clicking from the relays under the hood. I thought that was strange because I didn't think any of the wires I was working on had power when the car was off.
Anyway I get the wires all fixed up and deside to start the car and see if my O2 voltage problem was just bad wires. Well the car won't start! It sputtered a few times, but mostly just cranked. So I look at my logger again and notice that the TPS is reading 100% and doesn't respond throttle inputs. Great! So I pull out the multimeter and test the TPS. Pin 1-4 4.5k ohms, pin 2-4 .8k ohms to 2.5k ohms as you open the trottle. Those values are good according to my manual. Now I am thinking I have more wiring problems. Next I go into the car and pull the 24 pin plug from the ECU. I check the resistance from the TPS and it is the same as when I check it at the sensor. Now I am guessing it is an ECU problem.
The only other thing I can think of is that the ECU reads voltage (not resistance) thru the TPS. So has anyone had a TPS that tested good, but when hooked up to voltage was bad?
Thanks for reading this and any sugestions you have are welcome.