please help - revs going up and down.

[dmstripes]

Hi,

I am new to the site and would really value your help.
I have a 1991 2.4td ssr-x surf,which repeatedly has a problem with the revs picking up and then down,both when i am driving along or stationary.
This is becoming a big problem,because as the surf is a automatic,it just wants to pull away when the revs pick up,so you have to brake harder if your sitting at a junction.
I have been told that it is the throttle postion sensor and replaced it,but it has not solved the problem.
Would really value your help to solve this.

Cheers
Stripes.

[BUSHWHACKER]

Hi Mate, does the engine shake a lot when you switch it off?

[dmstripes]

Shaking

Hi,

Thanks for the reply.
No,the engine does not shake.
The engine starts and run fine, apart from the revs picking up.
They don't do it constantly,it is intermittent.
Could it be a dodgy idle up switch.

Many thanks

Stripes

[BUSHWHACKER]

The idle-up switch doesn't work when the transmission is in drive or reverse.
It could be a fuel pump problem, or maybe air is getting into the fuel somewhere.
Is you air filter clean?

[dave.j.robbo]

Hi,
Could it be a dodgy idle up switch.

The idle up should only work in park or neutral, so I wouldn't think it was that.

What sort of revs are we talking about? Do you have your a/c on? That will cut in and out, leading to a rise/fall in revs..

[BUSHWHACKER]

Check that all the rubber tubes are connected around the throttle assembly on the engine.

[dmstripes]

Revs problem

Hi,

The air filter is nearly new, serviced it not long ago.
This is happening with or without the air con on, but i mostly drive with it off.
The engine management light comes on when it happens.
Wanted to see what you guys thought before i go to my local toyota dealer,so they can see what the enigne management is saying.
Quoted me £79 a hour,and can't tell me how long it will take.
And these are the same people who told me it was the throttle postion sensor.

Cheers

Stripes.

[Vultch]

I am only repeating knowledge gained on this site,... but your surf should have a engine management diagnostic connector, it should be marked 'diagnostic'. shorting out two pins on this connector (search this site) gets the engine management to give a fault code, it does this via flashing the engine management light, a sort of 'morse code' count the flashes and you'll have the code (again search this site). This will give you an idea of what the engine thinks is wrong... good luck mate..79.00 quid an hour.. ouch

[MattF]

Look for the diagram of the vacuum pipes on the link below:

http://www.hiluxsurf.co.uk/forums/showthread.php?t=62

Especially check the one marked in red.

[internetsurfer]

To check the codes, switch the ignition to on (without the engine running). Locate the diagnostics port at the rear of the engine bay on the right-hand side of the firewall as you look from the front. Connect together pins E1 and TE1 using a bit of wire or paperclip, or similar. Now look at the check light and determine the codes in the following manner:

Count the number of flashes until a short pause - this is the first digit of the code. Count the number of flashes after the pause, this is the second digit.

After a slightly longer pause, if there is more than one code, the light will flash in the same manner for that code.

After all codes have been through once, after a longer pause the sequence will start again (so don't worry if you missed one!).

[dmstripes]

revs

Hi,

I have checked all the hoses and they are all fine.
I also checked the engine management and it gave me 3 codes.
The light flashed 4 times pause,8 times pause,12 times end.
Look forward to your ideas.

Cheers

Stripes

[BUSHWHACKER]

4= Coolant temp sensor

8= Intake air sensor.

12= Timer control valve (pump)

Hope these help.

[internetsurfer]

Code 12 Relates To Problems With The Crank Shaft Speed Sensor ON CERTAIN SITES.?????????????

here are some i found.

OBD1 Codes
1 Normal Condition.
2 Air Flow Meter signal.
3 Ignition signal.
4 Engine Coolant Temperature Sensor signal.
5 Oxygen Sensor.
6 RPM signal (Crank Angle Pulse).
7 Throttle Position Sensor signal.
8 Intake Air Temperature Sensor signal.
9 Vehicle Speed Sensor signal.
10 Starter signal.
11 Switch signal.
11 ECU/ECM.
12 Knock Control Sensor signal.
12 RPM signal.
13 Knock Control CPU (ECM).
13 RPM signal.
14 Turbocharger Pressure.
14 Ignition signal.
21 Oxygen Sensor.
22 Engine Coolant Temperature Sensor signal.
23 Intake Air Temperature Sensor signal.
24 Intake Air Temperature Sensor signal.
25 Air-Fuel Ratio Lean.
26 Air-Fuel Ratio Rich.
27 Sub Oxygen Sensor signal.
28 No. 2 Oxygen Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
32 Air Flow Meter signal.
34 Turbocharger Pressure signal.
35 Turbocharger Pressure Sensor signal.
35 HAC Sensor signal.
41 Throttle Position Sensor signal.
42 Vehicle Speed Sensor signal.
43 Starter signal.
51 Switch signal.
52 Knock Sensor signal.
53 Knock Sensor signal.
54 Inter-cooler ECM signal.
71 EGR System.
72 Fuel Cut Solenoid signal.
78 Fuel Pump Control signal.
81 TCM Communication.
83
TCM Communication.
84 TCM Communication.
85 TCM Communication.

[BUSHWHACKER]

Where did you get that code from? It maybe referring to the petrol engine Surfs.

[dmstripes]

revs

Hi,

Thanks for your help.
Looks like the wallet is going to take another pounding.
Anyway fingers crossed i can sort it now.

I do though, have one more thing wrong with my surf.
The heater does not work.
The blower works fine,but i had to clear all the hoses to the matrix inside the engine bay because they were rock hard, full of rubbish.
The valve in the engine bay opens,the one operated by the heater panel in the car.
All i can think of is,that the matrix itself is knackered,full of rubbish that is, because it is not leaking.
Is this common with surfs and is the matrix as hard to get out as it looks.
Sorry for taking up so much of your time.
All replies are greatly appreciated.

Cheers

Stripes.