Lack of Acceleration

The various diagrams explains the various codes.

Check for presence of water at the Throttle Position Sensor and Transmission range switch causing shorting or looseness or connectors.

Checek if wireharness had been dislodged while washing the engine. Some wires can get damaged by the exhaust when they have been dislodged from position and is resting against the exhaust.

i guess the water would have dried bcos it is up to 8 months now and it is not working.Where is the location of the Transmission Range switch. Thanks a lot

The switch is located at side of transmission. The diagram shows a slightly darker component, that is the switch. It is also known as Park Neutral Position switch. Are all the indicators on dash for gear position working correctly?

When water gets to electrical connectors, they can cause shorting or open circuits as it can cause oxidations etc. Remove the connector to check for oxidations/rust etc.

Such shorting can cause damages to the PCM as well.

Have you erased the trouble codes and test vehicle before retrieving the codes again?

Thanks a million times but i want to confirm if you are saying the switch is located near the gear box,besides even at park position the vehicle cannot raise up or accelerate when i press the acelerator.Again if i get you well if i erase the trouble codes, could it work?The indications or lights on dash are 1)service engine soon 2)A spanner sign.Finally,please what are the electrical connectors you mean and again cant fuel pump be a cause too.Thanks for your concern

You're welcome.

The trouble codes indicates a fault with the throttle position sensor and transmission range switch. The problem of not being able to accelerate should be due to a fault with the throttle rather than the transmission switch.

Connectors means for the transmisison range switch and the trhttle position sensor.

If it is a fault with the fuel pump, it would not show any codes. When trouble codes are present, they takes precedence over any others, with engine codes taking priority.

You should be concerned with P0222, P2104 and P2110 first.

Thanks a lot,but does it concerns the throttle body because i removed it to check for water and when we manaully connected it to a battery the motor on the throttle rotates and the throttle plate opened and close but we couldnt know the working condition of the throttle position censor.So does it means that we should not be concerned with the Transmission again or do we change the throttle body completely.Thanks

Reinstall the throttle and clear all trouble codes.
Test drive and if problem persists, retrieve the trouble codes and if it indicates a fault with the TPS, perform test on it.

Let me know if the codes are the same.

Please are you saying perhaps if i clear the codes the vehicle might accelerate or dont you feel if there is no problem the van could have moved since or could you explain further.Thanks

And how do i perform a test on TPS. Thanks

Problem could be due to intermittent failure of contacts and since you have removed the TPS to check, reinstall and clear codes. If it is intermittent poor contact the problem could have been cured. Test drive if problem goes away.

Engine codes takes precedence over transmission codes so you have to worry about engine trouble codes first.

Thanks please there is this spanner sign light on the dash board that dont go off after starting which according to the manual indicate that vehicle cannot accelerate.I wonder how can i make it go off bcos as long as it is there it cant accelerate unless with idle speed.because whenever i engage it to drive it will move but will not accelerate.Mind u i did not loose out the TPS from the throttle body,i only loose out the throttle body and clean it with carburator cleaner

Please dont those codes say specifically what to change or to be done

The diagram shows the procedures for testing the TPS.

honestly i dont understand the last message but i tested the throttle body manually using a battery i saw that the motor is rotating,the throttle plate is also opening and closing but i cant really say about the Throttle position sensor by the Throttle Body.Please what is the meaning of the Spanner sign on the dash board.It is constantly ON and without it going Off,i guess it cant accelerate.Also why is it rough idling and somtimes if i put ON the AC it becomes stable.Thanks

That indicates an error is present and recorded in the PCM. Get a scan done and let me know the EXACT code.

Thanks once again the codes are P2104,P2110,P2101,Po222 and P0708.Again some people suggested to me that i should chek
1 Fuel pressure regulator
2 Vacuum leak
3 Catalytic converter
4 Oxygen sensor
5 Plugs
6 Injector Noozles
Please i your expert idea on this not forgeting the codes that i gave.Finally please where can i find the fuel pressure regulator that is if you feel it is a good idea

P2104,P2110,P0222 and P0708 were previously found while P02101 is a new code which indicates a code for the Throttle Actuator Control (TAC) Motor Range/Performance .

The test have already been outlined in my replay dated Dec 22.

The fault lies in the Electronic Throttle Body (ETB), its wiring or the PCM and would cause the symptoms described. If you do not resolve these codes, checking other things are not going to help.

Have you carried out the pinpoint test as outlined above? If you do not perform the test to located the source, you are not going anywhere unless you want to start replacing things hoping they work.

You did not comment on my Jan 3 20011 suggestions that some people gave me.Again on the TAC motor,does it means the motor by the throttle body is not working properly bcos i told you b4 that i can see it roling but don't know how fast or is cycling of the key related to the ignition or what,pls comment.Pls can all these problems be tracable to the Throttle Body or if one can change the entire Thottle Body,will it work?The Pinpoint test is somehow difficult or how does it work?Thanks a lot

When i checked the test dated 21st Dec shows the the diagram that shows the procedure for testing but did not show how to do it and with what.Again there is something critical,Are the Throttle position sensor and the Throttle/pedal position sensor the same thing or different in terms of location.Where can the TAC be found.Thanks a lot

I can give you another hundred possible reasons but it is not going to work. Speculation does not work. When trouble codes are present you need to get them rectified first.

TAC is the actuator meaning it is the motor. Atttached diagrams shows the location of the parts concerned. TYhere are a few codes related to the motor and when motor is working, it does not mean it is good as it could be moving out of specs.

If you are not able to perform the test concerned, then it is best to get them done by professionals who knows how to do it.

Thanks a lot.I discovered something new,if i test the throttle plate manually using wire and plugging it to a battery it opens fully and remains open except i release the wire from the (two pins)swicth but if i bolt it back to the engine and test using the vehicle or key ignition on the throttle plate opens and then close again even when the ignition is still on.Besides even without plugging in the position sensor swicth it still behave the same.Secondly,in your diagram,is the throttle pedal position sensor in the pedal or outside. some parts are just identified by numbers.Finally at ignition on the check engine light keep on blinking.Thanks

Fig 8 shows the location of the TPS, which is at the air intake for the intake manifold. The name for the TPS is shown in diagram. Those represented by numbers are not of concern here.

Throttle opening is controlled by the amount of electrical current which is regulated by the PCM. Using direct battery voltage would open it fully but if it is plugged in, it would depend on what the sensors are telling the computer.

The TPS does not control the throttle opening, it only provides information to the PCM.

When you have trouble codes, the CEL would be indicating, that is the reason you need to rectify the problem by performing test as outlined and repair/replace parts or electrical circuit as necessary.

Thanks.Now if i just decide to change the complete Throttle body,in your opinion, to what extent will it clear the codes or will the solve the problem since all is pointing to that.Thanks

If the wiring and PCM are tested good, then replacing the throttle body should solve all the problems related to it.

Thanks again.Honestly i am releaved but you scared me again with the PCM and wiring thing.So how do i test for the this two.Besides how well do you trust buying of used throttle body from Ebay because i reside in Nigeria.Thanks

Test have to be carried out to determine which part is at fault so you need to be aware of the possibilities. It would be of no help if you do not test and just swap things, which can be costly and if it is not the cause, that would be wasteful.

Used components are not guaranteed to be good at all times and you have a 50/50 chance of getting a good or bad part. Personally I do not buy parts through the net so I am not able to make any comments.

Thanks a lot.This means if i have resolve to buy a new throttle body, the only test i need now is for the PCM and wiring.Think of this,can just going to wash the engine affect the PCM and wiring bcos there was no any sign prior to that

Washing the engine can cause short circuit of sensors which can damage the PCM. Wirings, especially connectors can oxidise/rustdue to presence of water and over time coductivity is affected.

Thanks a lot.Please i cant really get what the PCM looks like.Is it the brain box.what is the shape and exact location.And how many of the codes are related to to the throttle body.Because i have checked and there is no wire harness and no vacuum leak. Thanks

PCM is the the engine computer or brain box as sometimes called. Located at left rear of engine compartment, near brake master cylinder.

Does it mean even as it is thouroughly sealed water can penetrate inside bcos i checked it and it was sealed.So how do i know if it is defective or do you think that water can find its way in.Again,does it has its own fault code

Is can be damaged by wiring or sensor shorting out.

Don't worry about the PCM first, get the throttle actuator tested first.

When trouble shooting problems, we start from the cheaper and easier way first. Each trouble code should be attended to as it is starting from the lowest code.

Thanks.Wen i erased the codes then as i retrieved them again i got P2107,p2135,po721,po222,p2110,p2104,p0451.Should i go ahead to change the throttle body since they are related to it and no specialist to test those things u talk about,so i cant continue to waist time or what do you think.the engine RPM is about 840,intake Temp is 1075,throttle position is bt80% to 90%.When the i on the ignition the throttle plate clips or just open very slightly and close back.

Replacing the throttle is the easiest way to confirm if it is bad and could save you a lot of headaches.

Thanks.what about the accelerator pedal,do you think it has gone bad too

Both components are interrelated so I would start off by replacing one component first.

Thanks.a toyota camry shows code Po773 shift solenoid E electrical and the vehicle speed could not go beyound gear 1 i was just wandering what could it mean,please i am sorry for bodering you.Thanks

What year and engine type?

1997 and it is a 4 plug engine type

DTC P0773: LOCK-UP SOLENOID

1. Access ECT ECU. See Fig. 1. Using ohmmeter, check resistance between terminal SL and body ground with connector removed from ECT ECU. See Fig. 5.

2. Resistance should be 11-15 ohms. If resistance is as specified, replace ECT ECU. If resistance is not as specified, remove transaxle oil pan. Disconnect electrical connector (Pink wire on Camry and Camry Solara or Yellow/Black wire on Celica) at lock-up solenoid.

3. Check resistance between electrical terminal on lock-up solenoid and body ground. Replace lock-up solenoid if resistance is not 11-15 ohms. If resistance is 11-15 ohms, check and repair wiring between lock-up solenoid and ECT ECU.

© 2008 Mitchell Repair Information Co., LLC.