Need help to read fault logs of a D2

[phil&liz]

Hi All,
My son's D2 has developed two concerning issues. One being the auto continually reverts to limp mode. I would like view the fault logs using a nanocom or some other diag tool. The D2 and I are in Macleod Vic. and ask anyone close with a diagnostic tool willing to help to contact me. My mobile number 0407464676

Thanks
Phil

[PhilipA]

Do you mean that the M&S lights come up on the dash?
If so it is 90% that the XYZ switch on the auto is stuffed or needs cleaning and reassembling.
10% that the wiring loom over the back of the gearbox is chafed.
Look up XYZ switch in the google window at the bottom of the page.
When there is only one main cause it becomes easier.LOL
Regards Philip A

[Scouse]

Battery voltage needs to remain high too, if it drops too much while cranking it can bring up the M&S lights.

[Timmy]

G'day Phil, welcome to pop around my place on the weekend if you like. Bit of a cruise, I'm in ferntree Gully but the offer is there. Pm me if you like.

[phil&liz]

Thanks for the offer. I presume you have a nanacom. Normally I would be happy to travel to FTG but as the car is showing signs of a blown head gasket or worse I'm reluctant take it that far.
Chris, my son and owner could pick it up at your place early Sunday and bring it back later the same day. We are happy to leave a security deposit.

What do you think?
Phil

[Outback 1]

Do you mean that the M&S lights come up on the dash?
If so it is 90% that the XYZ switch on the auto is stuffed or needs cleaning and reassembling.
10% that the wiring loom over the back of the gearbox is chafed.
Look up XYZ switch in the google window at the bottom of the page.
When there is only one main cause it becomes easier.LOL
Regards Philip A

can also be caused by low battery voltage as previously mentioned also check for oil in the ecu

[Ceebrady]

Hi all,

Thank you for your offers, feedback and suggestions as to what the issue is that I am facing. Thanks dad for posting this before I had the opportunity.

I/ we believe that the issue is within the gearbox (mechanical or electrical) systems. Rather than with the battery voltage, and it doesn't logically seem to be the wxyz switch ( not saying that either of these are defiantly not the cause but they don't seem to make sense) I will further describe the issue encountered to given you all more clues.

The car will start and idle shift to reverse to drive or any of the forward gears all without issue, the vehicle can be driven in reverse without issue or in drive at low speed ( so that the box would not normally shift into second ) the box goes into limp mode when the engine revs go over 3000 rpm with mild accelerator use.

Anyway, we would still like to borrow a diagnostic tool to read the fault codes if there is anyone who lives anywhere between dandenong and Epping willing to lend one.

[phil&liz]

Now have a nanocom. Only one fault being recorded for the auto: P0722 (22) "stall speed monitoring"
have the system document "4 speed electronic automatic transmission system" revision 2.3 by Rover Group 1998 and have followed the fault tree analysis for fault code 22 (p0722)
It takes me to action: "measure resistance between pins 42 and 14 of the auto ecu" connector C0193
decision point: is resistance ~1050 Ohm. I am reading 330 Ohm so answer is no.
action: check wiring to output shaft speed sensor, If OK replace sensor.
Wiring checked OK.
I have found other information indicating the resistance of the speed sensor is around what I'm reading. So I'm not sure if the sensor is the problem?
The price from Land rover for the speed sensor is $42 (not bad)but will need to come from the UK and several weeks to arrive.
Also, the fault may be in the ecu. Does anyone have a ecu and/or a speed sensor to loan/sell so I can test?

Other observations:
Nanocom readings:

When High range selected Nanocom showed Low, when Low selected Nanocom showed High. Checked the same nanocom in another D2 where the selected range was displayed correctly on the nanocom.
The mode button worked correctly. When in High "S" lamp glowed. When in Low "M" lamp glowed.

The position switch did not read as was documented although no fault logs were created and the instrument cluster and lamps on the console displayed correctly. I have attached a table.

Your opinions and suggestions will be appreciated.

Regards
Phil

[phil&liz]

The attached table is the for the wxyz observations.

[PhilipA]

The mode button worked correctly. When in High "S" lamp glowed. When in Low "M" lamp glowed.


This is a known Nanocom "glitch"
Regards Philip A

[PhilipA]

Have you yet checked the wiring to the XYZ switch, where it goes across the top of the transmission near the switch.
They are known to chafe there and either short circuit or bridge one wire to another.
Regards Philip A

[sierrafery]

Now have a nanocom. Only one fault being recorded for the auto: P0722 (22) "stall speed monitoring"
have the system document "4 speed electronic automatic transmission system" revision 2.3 by Rover Group 1998 and have followed the fault tree analysis for fault code 22 (p0722)

It's some contradiction here and IMO you are missleaded a bit, for the D2 according to the workshop manual the code is described as P0722(22) -* Torque converter slipping = maintains current gear in low range, limp home mode in high range. Shift pressure to maximum...which has a logic cos a TC slippage is ''acknowledged'' by the management based on engine speed, road speed and output shaft sensor inputs (which means the stall speed monitoring) but i presume that LR described it so cos it's more common than the sensor failure... also it's well known that a stall situation can be induced by slipping TC

the action they recommend in that document you quoted is more specific to the OBDII/EOBD code description : P0722 Output shaft speed (OSS) sensor - no signal Wiring, VSS, ECM/PCM/TCM which is not specific for D2

so maybe you better go that route... or try to find somebody with a tester made on original protocol like Hawkeye, Lynx, Aurologic or T4 to double check cos it's suspect to me... i have both testers nanocom and hawkeye and unfortunately i must iterate that nanocom proved itself unreliable in many cases with all ECUs/BCU except the engine ECU

see 3'rd code in the attachment

that hi/low thing is well known with nanocom dont bother with it

[phil&liz]

Yep. Wiring checked connector to connector. Thanks PhilipA

[phil&liz]

I don't think it's a slipping torque converter. The d2 pulls OK with no obvious sign of slippage.
Getting a loan of another Auto ecu (GS8.87.0) tonight from Billymon. Will post results
Thanks All
Thanks for the loan Billymon

[Outback 1]

an important point might pay to check that the ecu is from the same model year and engine configuration as there may be variations from year to year between td5 to v8 as there is with fuse boxes and other components

[phil&liz]

The current auto ecu: GS8.87.0
0 260 002 474
ZF 0501 005 463
LR UHC 100 250
002 761C1214
GCD 622991528

I didn't get another gs8.87.0 last night. Billymon misunderstood me and brought the engine ecu instead.
The current engine ecu details:
Fuel type: sudhe022 (discovery/automatic/european)
tune id: sutdp007

[phil&liz]

Changed over the speed sensor but the problem still persists.
The resistance of both sensors are around 330 Ohm. The fault tree for code 22 in the Rover Group document should have listed the resistance at ~350 Ohm, not ~1050 Ohm

[phil&liz]

Tried another trans ecu yesterday. Slightly different symptoms, same problem.
Car with Jim Walton autos Heid. west for assessment today.

[sierrafery]

Maybe you should reconsider to trust in LR description of that fault code

[phil&liz]

Jim Walton autos didn't offer much more info than I already knew. They thought the car was taking off in 2nd sometimes.

The nanocom showed the solenoids with engine running and gear selector in D as: mv1 off, mv2 on, mv3 off.
Can someone provide solenoid combinations for each gear?
I have found solenoid 1 and 2 combinations for the BMW ZF4HP24/22 EH
1st gear: 1 on 2 on
2nd gear: 1 off 2 on
3rd gear: 1 off 2 off
4th gear: 1 on 2 off

If the combinations are the same for the D2 box it would indicate 2nd gear selected.

[phil&liz]

Success:clap2:
The auto is now working properly.
The problem was caused by the speed sensor ring moving down the output shaft due to the bolt at the end of the shaft coming loose.
I was able to tighten the bolt by removing the the transfer box rear cover plate.
I couldn't find a reference or torque setting for this bolt. So I guessed.

[phil&liz]

FYI
During my search on finding the solution to the auto problem I came across a document the details the ZF-4HP-22/24

Check out the E9 model in the attached url:
http://www.bmwe34.net/E34main/Trouble/Data/ZF%20Tech%20Guide.pdf

The table on page 44 shows the position of the shift control solenoids MV1 and MV2. They are different to what I posted earlier.

Thanks All for your help.
Phil

[phil&liz]

A special thanks outback1 and Bob from Cohuna auto trans. outback1 offered parts and put me on to Bob. Bob advised me how to get to the output shaft bolt.

[Outback 1]

good to see you got it sorted out mate[thumbsupbig]

[leonv]

Can you remember how you did it? I have the same issue with all electrical tests passing there still isn't a detailed thread with pictures relating to this issue

I would call cohuna automatic transmissions but I live in the U.K. and I would hate to think how much the phone call would be 😂