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Old 09-13-2014, 07:44 AM   #1 (permalink)
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Default 2008 Forenza Throttle position Sensor

TPS code P2135: ?'s

Can I remove the tps from the throttle on a 2008: the throttle does not have a blue dot on it.
What size torx? screwdriver?

From all I've read it seems I have must replace the throttle AND sensor if it turns out the sensor is bad for the 2008 Forenza. Is that correct?

This is an intermittent problem: High idle when I start the car and if I don't wait long enough for the idle to lower then the check engine light will come on when I shift into R or D. Sometimes the light will go out by itself, particularly if the engine is warm when I start it up next time - or - I simply disconnect the battery for a while.

If I drive enough miles (150) the computer will clear its history and I can pass auto inspection.

But I'd really like to fix the problem if possible.

Any help?
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Old 10-04-2014, 07:32 PM   #2 (permalink)
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hi. thats true you can not replace the tps on that throttlebody, you need to replace the whole unit. if that is in fact the problem. you could try to do the idle learn proceedure and see if that helps.

Turn the ignition ON for 5 seconds.
Turn the ignition OFF for 5 seconds.
Turn the ignition ON for 5 seconds.
Start the engine in park/neutral.
Allow the engine to run until the engine coolant is above 185 F (85C ).
Turn the A/C ON for 10 seconds, if equipped.
Turn the A/C OFF for 10 seconds, if equipped.
If the vehicle is equipped with an automatic transaxle, apply the parking brake. While pressing the brake pedal, place the transaxle in D (drive).
Turn the A/C ON for 10 seconds, if equipped.
Turn the A/C OFF for 10 seconds, if equipped.
Turn the ignition OFF. The idle learn procedure is complete.

the code dissapears when you dissconnect the battery because your resetting the ecu. try the idle learn and let us know what happens
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Old 10-05-2014, 10:29 AM   #3 (permalink)
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Thanks for this reply. I've never heard of the idle learn procedure. My car has already been warmed up this morning. This procedure sounds like I should try it from a cold start so I'll wait for tonight or tomorrow morning. Let me know if you think otherwise.

Thanks
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Old 10-07-2014, 02:14 PM   #4 (permalink)
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Hi. Yeah it's one of those things the suzuki mechanics keep secret lol. The engine just need to be up at operating temperature. The 185* as stayed in the directions. You could always wait and do it on a cold start but it will take a little but before the temp gets to where it needs to be. Let us know what's happens
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Old 10-07-2014, 02:41 PM   #5 (permalink)
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Didn't know there are Suzuki mechanics still around. Basically what I do when starting the car is to wait a few seconds to allow the rpm to come back down to around 900-1000, otherwise the engine jumps into gear instead of smooth transition. I don't think it has anything to do with temp. Probably more to do with the drive by wire throttle. 08 with 79k.
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Old 10-07-2014, 03:05 PM   #6 (permalink)
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Sorry I think you misunderstood me. in order to do the idle learn the car needs to be up to operating temp. It says in the idle learn procedure to let the car warm up to 185* Line 5 in the directions.
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Old 10-07-2014, 04:03 PM   #7 (permalink)
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I'm pretty good at misunderstanding directions. I'll give that a try.
thanks
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Old 10-08-2014, 07:31 AM   #8 (permalink)
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Okay: I've followed the directions for the 'idle learn procedure' - Correct me if I'm wrong: the true test is when the car starts up cold ( a warm start will keep the rpm to 900-1000, where it should be at) I'll wait a few hours then to start the car. Let me know what you think I should expect.
Thanks
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Old 10-08-2014, 12:09 PM   #9 (permalink)
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a cold start should idle about 2000 rpm ish (depends on ambient) and should smoothly drop to normal idle level as the engine warms up, about 3-5 mins.
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Old 10-09-2014, 08:37 AM   #10 (permalink)
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Okay: Here's the good news. Temp went into the 40's last night (probably doesn't mean anything other than to assure me of a cold start) - started the car, rpm around 2000+ and came back to 1000 + - with 15 seconds or so. No gear slam going from P to R. I think you guy(s) hit the nail on the head. Thanks for setting me straight on the 'idle learn' method.

No bad news.
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