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Discussion Starter · #1 ·
***** came round today to do some tweaking a fettling to the motors and found a fault on my car, could anyone explain the problem please?

Fault: P0122 - TPS/Pedal Position Sensor 'A' Low Input

There was another identical fault but the only difference was that it had 'pd' displayed before the TPS.

Cheers, Rob
 

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I'm pretty sure the TPS has a 5v supply, so your fault code could be indicating less than 5v.

I've had a TPS go dodgy before, the only symptom was a jerkiness on a closed throttle.
 

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Yes sorry, tps=throttle position sensor.

It would be worth unplugging the sensor connector and giving it a clean with contact cleaner, it's located on the side of the throttle body with a 3 wire connector, also worth checking the security of the wires in the connector.
 

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Did you do the 5 pedal pump thing? Something like that, use the search function on idle control valve reset :dddc: Although I had idling issues once before and italian tune-up fixed it.

I'm sure it's nothing to worry about. When you get your mods done I'm sure you car will give mine a run for it's money.

EDIT: You owe me a clean car, and a video.
 

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I got one too. No MIL light but I got an error code 420 catalylst below threshold efficiency (cos it isn't on the car anymore...).
Car runs fine so I assume it is to be ignored. I have a MIL kit but not fitted as I am lazy and no MIL light so didn't think it was required.
 

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Discussion Starter · #8 ·
Will do tomorow I think, its not really going to affect much then.

Nah didnt try that Il need your code finder again to see if its worked. You got all the cleaning kit you need now so no excuses.

Heres *****!


Sounds better in the flesh as it was very windy out but still very nice.
 

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R.I.P [The Red Zed] MG ZS 180
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Heres some info i dug up.

What does that mean?

A P0122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V).

Did you adjust it when you installed it? If the signal value is less than .17V then the PCM sets this code. Could be an open or a short to ground in the signal circuit. Or you may have lost the 5Volt reference voltage.

Symptoms

Symptoms may include:

Rough or low idle
Stalling
Surging
No/little acceleration
other symptoms may also be present

Causes

A code P0122 may mean that one or more of the following has happened:

TPS not mounted securely
TPS circuit short to ground or another wire
Faulty TPS
Damaged computer (PCM)

Possible Solutions

Some recommended troubleshooting and repair steps are:

Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.
 

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Cheers for the reply Alan. I thought I had got away with it :( Also you never said your decat pipes were below threshhold efficiency! I still have the mil kit so all good I hope. I cant remember if it was bank one or sensor one, but I'll add it to the to-do list (Witness guess what we're doing on service day...)

Cheers for the video, sounds quiet and tame though so I'll have to do something about that.
 

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Can I put the neighbour's cat in there?

I think that code might be an old stored one. So fingers crossed I shouldn't get a mil light. Its definitely bank1 but my guage doesn't say which sensor.

Bigfella have you got MIL elim kit fitted then? Your pipe has been on much longer than mine.

Is your throttle any better Wit or do you need to rescan for codes?

EDIT: Technically someone else sold it to me so you're safe Alan.
 

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*****, I do have a Mil Elim fitted. That and the de-cat have been fitted for around 8 months now, maybe longer. I have completed around 10k with them on.

No Mil light, but I keep getting that code. I clear it and eventually it comes back. I think Harbs shed some light on it, its something to do with the Mil Elim not being dynamic. The values are fixed, therefore the signals from that O2 sensor will be changed by this set value if that makes sense.
 

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Discussion Starter · #16 · (Edited)
Is your throttle any better Wit or do you need to rescan for codes?
Hopefully fine now ive cleaned it up, like I said never noticed any issues with it but will re-scan next time I see you if thats OK?

Cars feeling very good indeed since I cleaned and tweaked a few things, then again it could be the colder weather. Anyone else notice it?
 
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