Error code 22 - Input Shaft Speed Sensor System Short-circuit/Disconnection

[eyeballprawn]

Let the car warm up for about 5 mins this evening, crawled though the back streets, got out to the quiet main road and slowly pulled out. Transmission shifted smoothly 1, 2, then a bit of a flare and big clunk into 3rd. Neutral light is flashing and stuck in 3rd now. Didn't really sound like anything mechanically went wrong, it drives smoothly still in 3rd and will go into reverse fine, so headed home and pulled the codes to find:

Error code 22 - Input Shaft Speed Sensor System Short-Circuit/Disconnection

Does this usually indicate an faulty sensor, or is it a short in the wiring somewhere? I think I have a spare input shaft sensor in the garage, so I'll dig in there and replace it tomorrow and see if that helps but would like to know if there's any other wiring I should be checking while in there?

Fluid flushed with SP3 recently, looks good on the dipstick, no metal flecks.. but I will also drop it all out for inspection. The transmission condition was good when I overhauled it not long ago.

[elnevio]

I'd check/reseat all the plugs on top of the gearbox - it's easy to do, and free! Might simply be a bit of dirt ingress?

[Nick Mann]

One of my customers has a car that throws this issue up occaisonally. Just reseating the plug on the sensor has solved it for many months both times so far - the second time it showed up we had just put poly engine mounts in, so I suspect we knocked the bad connection slightly at the time.

[eyeballprawn]

Interesting.. I found my spare sensor too, just a bugger to get in there to check it now.

As a cheaper alternative to genuine Mitsubishi sensors, the following parts for the similar transmissions used in Hyundais seem to be identical and turn up lots of cheap options on eBay.

Input Speed Sensor, Hyundai part #: 42620-39051
Output Speed Sensor, Hyundai OE part #: 42621-39052

Even a set of both the genuine Hyundai sensors are half the price of the cheapest Mitsubishi ones I could find.

http://www.ebay.com.au/itm/Input-Out...-/120928942892

[eyeballprawn]

Whose idea was it to put the release tab on the connector facing the engine

Looks like a lot of parts needs to come off to be able to unplug it. I think I'll blow away the dirt with the compressor and try to unbolt the sensor itself with a flexi joint on the ratchet arm, it looks to be the easier option.

EDIT:
I see someone else has found out what a pain the input shaft sensor is to get at, this pic demonstrates the location well:

http://www.clubvr4.com/forum/showthr...l=1#post353038

[eyeballprawn]

Well this is bizarre. I removed my old sensor but it looks a bit different from the spare one I have. For a start, the number printed on my one is G4T08072, which is actually MD316605 SENSOR,CAMSHAFT POSITION (aka MD327107)

I assume they must work the same despite appearing different, but ASA specifies for me MR567292 (old MD759163) SENSOR,A/T SPEED and the spare has G4T07011 marked on it. Which makes me wonder if this has been previously changed, and the camshaft one was all that they had on hand. Either that or they subbed in this part at the factory.


Spare on left (correct part), one I removed on right (camshaft pos sensor).

IMG_4345.jpg


Showing the probe of the one I removed.

IMG_4346.jpg


ID marking on one I took out.

IMG_4347.jpg


ID marking on spare

IMG_4348.jpg

[Nick Mann]

Interesting. Have you discovered if the problem is solved yet?

[eyeballprawn]

I replaced the sensor with my spare and went on an hour long stop-start drive around the neighbouring suburbs. All seems to be working fine, and the error hasn't come back. I was disappointed that Evoscan doesn't seem to be able to read or clear the TCU DTCs, so had to pull the battery cable and subsequently relearn the idle and shift points. And refitting everything took no time at all.

Interestingly, the camshaft position sensor can be bought from Camskill for £56.17 and has been working fine as an input shaft sensor for at least the 3 years of my ownership.

http://www.camskill.co.uk/m8b0s2331p...7_8_CT9A%29%0A

... while the input shaft sensor itself is £62.95.

http://www.camskill.co.uk/m22b0s1401...and_EC5A%29%0A

I tested the harness too and that was ok, so I'll post up some info about doing that here later.