As the thread title notes, I am getting a Trans Failsafe Prog (TFP) message. When I check with Testbook (T4), it shows P1845 - CAN Bus ABS timeout error (maybe not unreasonable, see below).

I can't find anything on here or on RangeRovers.net about this fault but an internet search came up with this from the https://www.transmissionrepaircostguide.com/p1845/ page

Quote:

P1845: 2-3 Shift Solenoid Low Voltage OBD-II Trouble Code
In order to shift gears, the transmission has to route pressurized transmission fluid down the right channel. To do this, a little electromechanical device called the 2-3 shift solenoid is employed to channel pressurized ATF through the valve body. If a low voltage condition (like a short) is detected, then a P1845 diagnostic trouble code will be stored.

How Serious is the Code?
A P1845 DTC is fairly serious, especially since it has to do with the core shifting function of the transmission. Failure to address the problem will result in serious drivability issues, and eventually a nonworking transmission.

Now for a bit of background:
RRPhil has previously indicated the order of checking for TFP is:

Battery Voltage
Transfer Case
Transmission

This is where it gets murky...

I replaced the battery a month ago (with the same brand/model Calcium that I've been running for the past few years) but the battery voltage seems a bit low at 12.42 volts after an overnight charge then 30 mins of park lights being switched on. I may have to take it back to the importer for checking.

My ABS module is (slowly) winging its way to the UK for repair by ACTronics. (it was posted Express post on 20th April but, looking at the tracking information, it doesn't appear to have reached the UK as yet. ) As a result of no ABS module, there is no valid speed available to the transmission nor transfer case. The transfer case won't change range - that may be a function of no ABS signal. T4 reports, when looking at the transfer case, the L322 is doing 319mph when it is stopped! Probably why the transfer case won't change range. T4 doesn't indicate any transfer case errors.

(Loss of the ABS module affects a lot of stuff- speedo, ABS, odometer, park distance control, cruise control, emergency brake assist, dynamic stability control, hill descent control, air suspension, and who know what else!)

Because of the all bongs caused by all the above, I have no idea when the Trans Failsafe Prog error started. I only noticed it on Saturday but I'd say less than a week ago. I would have noticed the message even though I wasn't religiously checking the message centre.

I guess I'm clutching at straws assuming the fault may be a low battery voltage. The T4 error message of CAN Bus timeout doesn't gel with the transmission website statement of low voltage.
Any comments would be greatly appreciated. Ron B. VK2OTC
2003 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

A member on the AULRO forum pointed me to this YouTube video.



Perhaps it's all ABS module related. My L322 seems to be changing gears at the right speed so I am a little confused. Ron B. VK2OTC
2003 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

These are delicate electronics at the best of times...

Running it without the ABS module is asking for trouble IMHO, there will be direct failures as you mention and also indirect, when a canbus message is expected after a certain time or other event....

I don't think there is any point trying to sort out the new error until you have the module back and have no faults showing...  Pete
__________________________________________________
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2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I've been driving it for nearly a month without the module and about 5 months with it being faulty, i.e., with the DSC light on. Everything else worked.

The module was posted to the UK for repair on 20th April. Ron B. VK2OTC
2003 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

WOW, that is some vid
explains some things to me but mainly the terminology goes over my head
i will have to watch it again RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

Good video off the "Dark side"  2018 SE SDV8 4.4 Byron Blue

knares wrote:

explains some things to me but mainly the terminology goes over my head

I guess I'm a bit fortunate. I trained as an electronics tech and worked in the international telecoms business for 37 years so the terminology is familiar to me. I need to find some of those needle like probes for my workshop - I could make some from my wife's sewing needles

I might put my oscilloscope on the CAN bus wires for a bit of a look see. I'll put my multimeter across the wires, too. I might need to slip 120 ohm resistor leads down the pins like he did with the probes. That would terminate the CAN Bus correctly.

A member of the AULRO forum suggested that transmission speed information might come from speed sensors in the trans:

Quote:

I believe the gearbox has an input and output speed sensor and it uses that to shift, etc.

That may well be the case and would go a long way to explaining why my trans seems to be working OK.

Where's RRPhil when you need him?  Ron B. VK2OTC
2003 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

A relation, who is a mechanic, tunes cars with an oscilloscope, he showed me how he did it,
I bought the same model machine, never could get it to work RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar