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Anyone Familiar With The Saab Throttle Body Problem ?

A 2000 9 3 turbo. Has code P1260.

I have looked around and found that this means that the PWM going to the th rottle control is too small. There is a reset procedure which has been done but didn't fix it.

Must be current detected because from what I've read it will throw the same code if the wiring is bad to the umm, thing. I believe it must be a soleno id that works against something to open the throttle to increse idle.

I find it hard to believe it is a wiring fault because it is not going unde r the car. The harness does not appear to be dmaaged in any way. Wires in a harness lke that don't just break, and if they did and that's the problem, why always those wires ? Makes no sense.

Got a couple of weeks to iron this out before the emissions testing. Been looking for the full manual. I did find some testign procedures online but they seem to require a special tool from Saab. This car is a little too old for that, so I am looking for ways to figure this out without it. I found the ECU, and now have to figure out how to unplug it. Online there was a di agram showing which connections at the plug go there, and I don't esapecial ly want to break anything.

Actually I am considering seeing if I can take the cover off the ECU and ch eck continuity from the board itself. In fac might find some bad solder con nections - now this has not been specifically tested but I thnk the next is a load test. It is a stick so I could just leave it at idle and start lett ing out the clutch and see what is on that circuit.

Any ideas ? TIA

Reply to
jurb6006
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The first O2 sensor (between the engine and the catalyst) is *supposed* to fluctuate. If you plot the voltage vs time when everything is working right, it looks like a sine wave with a period of a couple of Hz. If it's a flat line, the O2 sensor is probably bad. If it's a funky-looking wave, either the O2 sensor is trying to crap out, or it's accurately telling you that the engine is doing something weird.

The *second* O2 sensor (after the catalyst) should have a relatively smooth output. If it has a sine wave, just like the first O2 sensor, then usually the catalyst isn't doing its job.

Gee, Rocky, that trick never works!

There are several things that an OBD-II computer checks on. Things like misfire it can check any time the engine is running. It can only check the catalytic converter after the engine has been running for a while and heated it up. It can only check some of the components (like EGR) when you've been driving at a certain speed and load for a little while.

It keeps track of which tests have and have not run, and that's visible when the smog test place plugs in the scan tool. On my old PC-based scan tool, on a 2001 Toyota, there are 7 tests listed: misfire, fuel system, component, catalyst, evaporative system, O2 sensor, and O2 sensor heater. If I clear the codes and start the engine, cold, the first three will show as "tests have run" within a few seconds, but I have to actually drive the car to get the other four to show that the tests have run.

I know in California if not all the tests have run, the smog test station will tell you to go drive it up and down the freeway a few miles and come back. I don't know if that's the case where you live.

If the engine's running, it is. The goal is to minimize it as much as economically possible.

Tuning for best fuel economy is actually a little different than tuning for lowest emissions.

Matt Roberds

Reply to
mroberds

Thanks for the info.

Actually if not for the catalytic it might be. But that is all on the other end.

Check engone came back on within a day. Don't know which code it is yet. We figure if the throttle body is in lip hoe mode then that's that, if not it should be the 1252.

I probably won't see the car agian for a couple of days. When I do I'll keep you "posted".

Reply to
jurb6006

anything.

TPS (Throttle Position sensor)?

I beleve with some cars it'll go into limp mode and use other sensors to detect the average intake of air and attempt to create an aproximate throttle position. A bad feed back sensor (TPS) may report your throttle at being to low of a position. This cuts idle back a bit and makes the pulses to the throttle body injectors kind of narrow...

Also cam and lower flywheel sensors can put it in limp mode if they don't both agree. Loose belt, bad sensor etc..

Of course, vacuum leaks around the carb area and intake could also through a monkey into it!

Jamie

Reply to
M Philbrook

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