M4.3 to M 4.4: Really that simple?

[Chuck W]

It looks more like it's the accelerometer that is causing the code. It's referring to the one attached to the front subframe.

Check it's connector or swap it out with another.

[scot850]

If I recall correctly the barometric pressure sensor, the accelerometer and the A/C high pressure sensor are all on the same circuit.
It has been a while but I think I am correct on this.

Neil.

[Geevs]

Thanks for the replies.

I recall reading that the accelerometers in the 94-97 850s are under the cowl between the cabin filter and the passenger wiper motor. I haven't checked yet. If the accelerometer is indeed under the cowl, is this functionally any different from the one in the 98 x70s mounted in the front subframe?

[Chuck W]

On our 97's the accelerometer is on the front of the subframe. It'll take you 2 seconds to stick your head under the front of the car to verify if it's there or not.

[Geevs]

Which sensors are in the 1998 s70/V70 that M4.4 expects to find but are not in the 850s? I recall they are:
- accelerometer
- barometric sensor
- MAP
- IAT

Anything else? Where are the location of these sensors in the x70? I'm heading to the junkyard this weekend to look for these.

Thanks!

[Chuck W]

Is your accelerometer missing?

Not sure why you need to add any of that stuff, however. The car should already have an accelerometer and a baro sensor. The IAT is not needed.

When I did the initial M4.4 conversion on my '97 T5, I set the injector calibrations, disabled the rear O2 stuff, disabled the IAT, did the AC software mod and that was it. Didn't add anything.

The MAP sensor is not a stock item, it is an add-on for data-logging to get boost, as the stock programming does not use such a thing.

[Geevs]

I looked at the 2 possible location for the accelerometer as per the diagram below:

http://volvospeed.com/vs_forum/topic/17 ... nt=2424806

and still didn't not find it. My car is a Canadian 96 850R with factory M59 5-speed. These were special orders for the Canadian market that was not sold in USA. The ECU is M4.3 but is not OBD2 compliant as it doesn't have a rear O2 sensor.

Anyway, the accelerometer is definitely not under the wiper cowl. I searched near the front subframe under the AC compressor and didn't see anything mounted on the subframe nor did I see any unused wiring connector.

I did find a sensor in front of the bottom of the radiator facing the opening of the R bumper front lip. It is connected to a wiring harness. What is this sensor - the barometric pressure sensor?

Is the acceleometer needed in M4.4 and can it be disabled?

[Chuck W]

Pictures would help.

Sounds like the outside/ambient air temp sensor for the ECC.

[Geevs]

I went back into Tuner Pro and disabled the Accelerometer in both locations. Reflashed and all good now.