Thread: EVO showing Transmission Fault

Originally Posted by IanP

Been playing with the EVO (love it!!!! :-)) and am getting an auto gearbox fault that I cannot identify or understand

The fault comes up as 'P0097 Lock-up clutch monitoring'. Can anyone shed some light on what it is and what needs to be done about it?

Cheers
Ian

Hi Ian,

I get similar "Lock-up clutch monitoring Pxxxx" faults. On the Nanocom One I can clear the initial fault but am left with a "Lock-up clutch monitoring P0000". I think Fluids also mentioned that he had seen these kind of faults with his Nanocom One.

I'm treating these messages as a Nanocom bug for the moment.

cheers
Paul

Hi Paul,

Thanks for the reply, I have cleared the fault a number of times and it still keeps coming up

I have seen references to the auto gearbox clutch upgrades and am wondering whether it was some heavy towing I did last year pulling the van over the mountains in Tassie?

The vehicle drives well and does not have any problems with gear changes; so it remains a bit of a mystery. I get a bit anal with this type of fault as I want to track it down and fix it if it is likely to cause me problems at some stage in the future.

Cheers
Ian

Originally Posted by IanP

Been playing with the EVO (love it!!!! :-)) and am getting an auto gearbox fault that I cannot identify or understand

The fault comes up as 'P0097 Lock-up clutch monitoring'. Can anyone shed some light on what it is and what needs to be done about it?

Cheers
Ian

Snap! I've got this one too. I'll keep watching with interest.

The only (possibly) related issue I have with my 1999 Td5 Auto is that I occasionally get a loud clunk/thump type jerk when accelerating lightly as the 'box upshifts from 2nd to 3rd.

My searching on that issue has pointed toward "normal driveline tolerances being taken up within the box".

I'l have a hunt back through my browser history and see if I can contribute anything more from my research on this fault.

Originally Posted by IanP

Hi Paul,

Thanks for the reply, I have cleared the fault a number of times and it still keeps coming up

I have seen references to the auto gearbox clutch upgrades and am wondering whether it was some heavy towing I did last year pulling the van over the mountains in Tassie?

The vehicle drives well and does not have any problems with gear changes; so it remains a bit of a mystery. I get a bit anal with this type of fault as I want to track it down and fix it if it is likely to cause me problems at some stage in the future.

Cheers
Ian

I've had similar unclearable/phantom faults the disappear with updates to nanocom firmware, so I caution against assuming a fault actually exists, especially as this if the first release of the nanocom autobox module. As with any v1.0 release there are bound to be some bugs.

Edit: P0097 is "Air Inlet Temperature Sensor 2 Circuit Low Input" .
Possible causes:
- Intake air temperature sensor harness is open or shorted
- Intake air temperature sensor electric circuit poor connection
- Faulty Intake air temperature sensor

The fault is triggered when:
The Engine Control Module (ECM) has detected a low voltage condition on the Intake Air Temperature (IAT) circuit.

This fault should show up on the TD5 engine ECU IF it actually exists.

As noted above, this is most likely to be a bug in the Autobox module. It definitely fails sanity testing as a gearbox fault.

Ian,

The attached document contains a troubleshooting guide ('tree analysis') for the 'lock-up clutch monitoring' fault which could be of help (page 61).

Regards
Matt

Hi Matt,

Interesting doc. Thanks for posting.

I'd make the observation that "Fault 005 Torque convertor lock-up clutch monitoring" should trigger limp home mode, yet no-one has reported seeing the flashing M and S dash lights. I'm still think this is most likely a nanocom induced ghost fault.

cheers
Paul

Hi Matt and Paul,

I have seen the reference to P0097 referring to 'Air Inlet Temp sensor...' and as stated it make no sense at all.

Matt, interesting Doc but unfortunately it does not seem to shed any light on the problem.

I will continue to try and hunt down any possible explanations and will post if I find anything.

In the meantime, I WILL BLAME COLIN!

Cheers
Ian

After some further reading, it appears Fault 005 is associated with a P0741 fault, and Topix does have a diagnostic work flow for this fault code (see attached).

RAVE (page 44-19) indicates that while a P0741 will illuminate the MIL lamp, it doesn't illuminate the Manual/Sport lamps, and does not activate limp home. The effect of the fault is listed as "May effect drivability".

RAVE also indicates that the EAT (Electronic Automatic Transmission) ECU does take an input from the Inlet Air Temp Sensor on the CAN bus. Unfortunately non of the trouble shooting information has much to say about what effect a Air Temp Sensor fault will have on clutch lock up, so I'm still inclined to think this is a most likely phantom fault.