TPS Codes
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TPS Codes
Have a 2000 Explorer 4.0 SOHC with 46k. Would start and run feebly for a few seconds si I replaced the TPS and fuel pump relay with OEM parts and removed the IAC and cleaned thoroughly. After "learning" period all is well. Cleared the codes (scanner from local independent) twice but only reappears after second drive cycle and is always the same (1121 TPS/circuit). There are no performance issues - starts and runs great. Just can't get the light off!! Any suggestions.
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Parryapical, the OBD II system will not recognize a trouble code until the second consecutive time it sees it. The trouble is there on the first start-up, it's just not recognized until the second start-up.
The 1121 code says: "TPS not consistent with MAF sensor". Since you've replaced the TPS, I would look at the MAF. Check the plug-in first. Have you disconnected the battery for 10 minutes? If not, do so and see if that has any effect. There are some checks you can do with a multimeter. A bad MAF will usually show up as a loss of power above 2000 rpm or so........
The 1121 code says: "TPS not consistent with MAF sensor". Since you've replaced the TPS, I would look at the MAF. Check the plug-in first. Have you disconnected the battery for 10 minutes? If not, do so and see if that has any effect. There are some checks you can do with a multimeter. A bad MAF will usually show up as a loss of power above 2000 rpm or so........
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Tps
Lone, thanks for the response. There are NO performance problems, no loss of power or hesitation. Forgot to mention that I also replaced the air filter (quite dirty). Disconnected the battery (maybe not quite 10 mins) and reset PCM with a scan tool twice but the MIL always relights. Unfortunately my multimeter has died so I cannot check resistance across the TPS connection until I replace it. But I emphasize that the vehicle starts and runs A1.
Unfortunately it will defacto flunk upcoming emissions check with the light on.
Thanks again. Parry
Unfortunately it will defacto flunk upcoming emissions check with the light on.
Thanks again. Parry
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The first thing they do is called a "bulb check" which means they shut the engine off, turn the key to the on position and wait for the bulb (s) to go first on then off. This prevents the obvious bulb removal or bulb burnout from defeating the test. I have also been told that OBD II systems are not being tread mill tested anymoreat but with the engine off are simply being scanned. But it was a nice thought!!
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Parry, if you have a multimeter, you can check the wiring to the TPS. Specifically the ground wire. A poor ground can be fixed by simply splicing in an aux ground to an engine bolt.
You can also try spraying WD-40 in the wiring connector, and unplug/replug a couple of times.
This has to be something simple, since a new TPS fixed it, and it runs so good.
You can also try spraying WD-40 in the wiring connector, and unplug/replug a couple of times.
This has to be something simple, since a new TPS fixed it, and it runs so good.
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