TheLeftTomb707 Posted September 12, 2023 Share Posted September 12, 2023 I'm testing my TPS I installed a while back because I just found out you need to calibrate them. It's showing 4.52 at closed throttle and 0.28 at full open throttle which is the opposite it should be right? I tested it through the onboard diagnostic on my 1990. Your guy's help would be greatly appreciated. Link to comment Share on other sites More sharing options...
2seater Posted September 12, 2023 Share Posted September 12, 2023 Yep, that's backwards. If that is the case how does the engine respond? Is it the correct TPS? If memory serves, there are similar TPS models from earlier years of GM that have two terminals reversed although they will plug in properly. I don't have one in front of me but I believe the terminals are marked on the case. Link to comment Share on other sites More sharing options...
TheLeftTomb707 Posted September 12, 2023 Author Share Posted September 12, 2023 It actually runs relatively fine, just a high idle. I got a new TPS and connector and the I think I got them from AutoZone, but not too sure, and there compatibility said it was right one. I'm not home rn so when I get home I'll look at it. Link to comment Share on other sites More sharing options...
2seater Posted September 12, 2023 Share Posted September 12, 2023 (edited) 3 hours ago, TheLeftTomb707 said: It actually runs relatively fine, just a high idle. I got a new TPS and connector and the I think I got them from AutoZone, but not too sure, and there compatibility said it was right one. I'm not home rn so when I get home I'll look at it. It is possible the TPS is correct but the connector may have a different color code?? The high voltage at the idle position does usually cause high idle, but I have never seen one at full voltage. This tells the ECM two things, it is at a level that would call for power enrichment when running at rpm or would turn off the injectors while cranking because it thinks it is in clear flood mode. I am surprised it runs okay. Edited September 12, 2023 by 2seater (see edit history) Link to comment Share on other sites More sharing options...
TheLeftTomb707 Posted September 13, 2023 Author Share Posted September 13, 2023 The connector looks like it's the acdelco one and the wires are A:black, B:blue and C:grey. ed: actually I just looked at my AutoZone history and it says it was a MAP connector, but the in the picture it has all white wires and mine has the aforementioned colors, so I don't know what's going on. Link to comment Share on other sites More sharing options...
Ronnie Posted September 13, 2023 Share Posted September 13, 2023 33 minutes ago, TheLeftTomb707 said: the wires are A:black, B:blue and C:grey. Are with wire colors connected to the TPS in the sequence shown below? 1 Link to comment Share on other sites More sharing options...
TheLeftTomb707 Posted September 13, 2023 Author Share Posted September 13, 2023 10 minutes ago, Ronnie said: Are with wire colors connected to the TPS in the sequence shown below? I think that's the problem, the black is going to the left of the tps when on the throttle, which from what I understand is the top in the photo, which should be the grey. do I just switch the 2 wires or do I need a new connector? Link to comment Share on other sites More sharing options...
Ronnie Posted September 13, 2023 Share Posted September 13, 2023 I would just swap the wires if you if you can't find the right connector easily. Do you still have the old connector to use as a reference? If so that would be the best way to make sure you get the wires connected to the TPS correctly. 2 Link to comment Share on other sites More sharing options...
2seater Posted September 13, 2023 Share Posted September 13, 2023 I am making the assumption that is the plug face that connects to the sensor and the latch is the right side in this view. Orient the plug face as shown and make sure the factory color codes connect in the order shown. No need for a new plug as it was hand connected in the first place. Just correct the order. When finished it should be in the range of .38v-.42v 1 Link to comment Share on other sites More sharing options...
TheLeftTomb707 Posted September 13, 2023 Author Share Posted September 13, 2023 It does work and I calibrated it to .42 but I need to get bigger wire connectors tomorrow and I'll update you guys then. Thanks for your help, I would've never thought the connector was wired wrong. 2 Link to comment Share on other sites More sharing options...
2seater Posted September 13, 2023 Share Posted September 13, 2023 It may take a little while for the ECM to learn the new throttle position signal vs other input. Link to comment Share on other sites More sharing options...
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