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 Diy: Throttle Position Sensor (tps) Adjustment, to solve car judder problem of wira
jigc
  Posted: Aug 10 2005, 07:54 PM


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hi,

let me share my DIY biggrin.gif

Car: wira 1.3 (4+yrs), mmc ecu type
Symptom: car judders at low gear (low rpm)

condition: engine is fully warmed up, engine is off!

1. put a 0.45mm spacer in btw fixed SAS and throttle lever (pic 1)
2. remove the metal clip at connector of tps
3. remove the harness
4. check resistance (ohm) at pin#3 and pin #4(pic 2)
5. if there is connectivity (~0 ohm), u need to adjust the TPS;
if there is disconnectivity (infiniti ohm), u may not to adjust the tps.
7. loosen the 2 screws of tps and adjust CCW.
8. adjust the tps CW, until pin#3 (+) and pin#4 (-) is discontinued.
9. connect the harness
10. install the metal clip
11. remove the spacer
12. test drive!

----------------
ecu detects idle position when throttle position sensor is at discontinues state.
I checked at step5, there is a connectivity.
Meaning: my tps was at over-cw state and ecu always detected that throttle has been depressed! (infact it is NO)

This is what i guess.
When clutch was released, throttle pedal is not depressed (butterfly was closed), but ecu thought throttle has been depressed, so, it closed the ISC valve.
There is no air goes into intake manifold, thus, car judders happened.
I adjusted the tps, and it improved my low speed travelling at low gear.

btw, pls try at ur own risk 19.gif

jigc

----------
edited:
1a. condition was added
1b. polarity of pins was added


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jigc
Posted: Aug 11 2005, 12:55 PM


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this is what i guess: tps states


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drexchan
Posted: Aug 11 2005, 01:03 PM


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you have made good use of the service manual man.. smile_thumbup.gif

unforturnately, most members here use S-VDO ECU..


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jigc
Posted: Aug 11 2005, 01:16 PM


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QUOTE (drexchan @ Aug 11 2005, 01:03 PM)
you have made good use of the service manual man.. smile_thumbup.gif

unforturnately, most members here use S-VDO ECU..

haha! yap, with the manual, i can do most of diy/adjustment, just with tools available.
i'm still finding a site to host the manual. the original site was down.
how does siemen ecu differentiat idle state and throttle state?


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drexchan
Posted: Aug 11 2005, 01:47 PM


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jigc,

the siemens-vdo TB uses a servo'ed butterfly to control the idling, instead of a by-pass valve.

There's no way one could adjust the idling speed using a screw driver.

The butterfly isn't fully closed during idling, but opens at a certain angle, and contunuously making adjustement to achieve the ECU-preset idling speed.

I have added a air-leaker primarily to increase the idling speed. What I found out was -

1. if the leakage isn't great enough, the idling speed will not increase as the butterfly closes to compensate for the increase of air intake (manifold pressure didn't increase)

2. if the leakage is high enough to overcome the adjustment range of the butterfly, the idling speed will increase slightly, with higher MAP reading - and higher FC especially for town driving.

3. if the leakage is greater, the idling will become unstable. Just like Hi CAM..


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jigc
Posted: Aug 12 2005, 09:33 PM


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no gears! smile_thumbup.gif
no wonder siemen type no need to wait till the engine light off before cranking.
mmc type, when u switch on the engine, the ICS's DC-motor (4g1* engines) initializes by open the valve to max, then close it (before engine light off).

anyway, after these few days driving, i confimred this adjustment solved my low rpm juddering problem. smile.gif


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BridgestoneRE711
Posted: Aug 20 2005, 05:39 PM


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jicc,
i don't get what u mean witht he SAS level .
mine is adjusted . and i want to fix it back to default space ... what is the default screw space ?
a 45 mm i slot behind to 'press' the gas right ?

then the pin 3 and pin4 ... use a meter to check ? u mean which one i should put positive which one i should put negative to check the ohm .

lastly , i turn the tps clockwise and tps anticlock wise until there is no reading on the meter ?
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jigc
  Posted: Aug 20 2005, 08:50 PM


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QUOTE (BridgestoneRE711 @ Aug 20 2005, 05:39 PM)
jicc,
i don't get what u mean witht he SAS level .
mine is adjusted . and i want to fix it back to default space ... what is the default screw space  ?
a 45 mm i slot behind to 'press' the gas right ?

then the pin 3 and pin4 ... use a meter to check ? u mean which one i should put positive which one i should put negative to check the ohm .

lastly , i turn the tps clockwise and tps anticlock wise until there is no reading on the meter ?

bs711,

Fixed SAS is a bolt, its position was tighten by a lock nut. the throttle lever (not level, typo there) will touch one of end of fixed SAS. the 0.45mm spacer is put in btw them during tps adjustment.

pls do not adjust the fixed SAS, it was accurately adjusted by potong smile_thumbup.gif

this is what should u do according to the manual to readjust the fixed SAS:
1. loosen the tension of accelerator cable
2. back up fixed SAS lock nut (turn CCW)
3. turn the fixed SAS CCW until the throttle valve is (the butterfly) fully close
4. turn the fixed SAS CW until the point where the throttle lever is touched. Stop at the point which the throttle valve begins to open. at this point, turn the fixed SAS 1.25 turn CW.
5. tighten the lock nut securely (hold and make sure the fixed SAS doesnt move)
6. adjust back the tension of accelerator cable

back to tps adjustment:
pin#3 and pin#4 is a variable resistor, so i dun think the polarity is important.
btw, pin#4 is ground, so, u can treat it as negative.

i used analoge multimeter, where there is no connectivity, the indicator dropped CCW (away from zero).
if u use digital multimeter, it should show infiniti...i guess.
and u should turn it ccw first before adjust it cw.

damn, did i mention u should adjust this after the engine is fully warmed up?

jarneh smile.gif

jigc





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jigc
Posted: Aug 29 2005, 10:00 PM


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QUOTE (drexchan @ Aug 11 2005, 01:03 PM)
you have made good use of the service manual man..  smile_thumbup.gif

hello guys, workshop manuals are shared here. biggrin.gif


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BridgestoneRE711
Posted: Sep 3 2005, 06:31 PM


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stupid question here .. what is CCW and CW ?
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jigc
Posted: Sep 3 2005, 06:55 PM


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QUOTE (BridgestoneRE711 @ Sep 3 2005, 06:31 PM)
stupid question here .. what is CCW and CW ?

huh.gif

cw = clockwise
ccw = counter clockwise


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