P38A ECU locations

300bhp/ton · Apr 2, 2023

Can anyone tell me exactly where I can find these ECU's and any other bits of wiring/connectivity I should be checking?

1999 4.6 Thor Range Rover p38

-Wabco D ABS ECU (can't connect with Nanocom, although another diagnostic tool called Pscan does)

-Hella CC (also never been able to get it to connect/communicate with the Nanocom)

-BECM (used to access this loads to disable the EKA when having key issues previously, now also getting unable to communicate error on the Nanocom)

For reference the Nanocom will connect and work with all the other menu options e.g. Motronic, Gearbox, Airbag, EAS & HEVAC).

The cable looks like new still (supplied with Nanocom), Nanocom looks like new as does the OBDII connecter on the vehicle.

Thanks.

kermit_rr · Apr 2, 2023

300bhp/ton said:
Can anyone tell me exactly where I can find these ECU's and any other bits of wiring/connectivity I should be checking?

1999 4.6 Thor Range Rover p38

-Wabco D ABS ECU (can't connect with Nanocom, although another diagnostic tool called Pscan does)

-Hella CC (also never been able to get it to connect/communicate with the Nanocom)

-BECM (used to access this loads to disable the EKA when having key issues previously, now also getting unable to communicate error on the Nanocom)

For reference the Nanocom will connect and work with all the other menu options e.g. Motronic, Gearbox, Airbag, EAS & HEVAC).

The cable looks like new still (supplied with Nanocom), Nanocom looks like new as does the OBDII connecter on the vehicle.

Thanks.

Wabco behind the glove box
Becm under drivers seat
Hella is the cruise one? Isn't that part of the control unit that has the bellows control? Not sure

Grrrrrr · Apr 3, 2023

Where's Hella CC on the Nanocom?

kermit_rr · Apr 3, 2023

Grrrrrr said:
Where's Hella CC on the Nanocom?

2nd screen i think.. under EAS?

kermit_rr · Apr 3, 2023

kermit_rr said:
2nd screen i think.. under EAS?

i wasnt far off...

Grrrrrr · Apr 3, 2023

kermit_rr said:
i wasnt far off...
View attachment 285530

I'll be damned. Not noticed that before but then I only have the diesel and GEMS modules so maybe I cannot see it.

I'd imagine that must be must be above the throttle pedal behind that panel or in the engine bay near the engine ECU. RAVE must have a picture?

kermit_rr · Apr 3, 2023

Cruise Control ECU (Z121)
behind RH side of fascia right of steering column

pwood999 · Apr 3, 2023

I think it's only in the Motronic section ? The cruise ECU was changed around the same time they went from GEMS to Thor, so no point in having it in the other sections.

Licensing is engine ECU only, so all other modules should work on any Nanocom.

kermit_rr · Apr 3, 2023

pwood999 said:
I think it's only in the Motronic section ? The cruise ECU was changed around the same time they went from GEMS to Thor, so no point in having it in the other sections.

Licensing is engine ECU only, so all other modules should work on any Nanocom.

yep on the emulator, HELLA CC only shows under motronic (Thor), not GEMS or Diesel

nigelbb · Apr 4, 2023

If the Nanocom cannot connect to multiple modules it's extraordinarily unlikely the multiple modules have gone bad. It's far more likely that socket &/or wiring that the Nanocom connects to have gone bad with corrosion.

300bhp/ton · Apr 4, 2023

nigelbb said:
If the Nanocom cannot connect to multiple modules it's extraordinarily unlikely the multiple modules have gone bad. It's far more likely that socket &/or wiring that the Nanocom connects to have gone bad with corrosion.

Noted, but how and where would you check this? The vehicle is remarkable clean in regards to corrosion. Even down to the fuse panel and relays under the bonnet looking like new, which I know can also be a different issue some p38's suffer with.

Grrrrrr · Apr 4, 2023

pwood999 said:
I think it's only in the Motronic section ? The cruise ECU was changed around the same time they went from GEMS to Thor, so no point in having it in the other sections.

Licensing is engine ECU only, so all other modules should work on any Nanocom.

Apart from wabco C if yours is Thor.

kermit_rr · Apr 4, 2023

300bhp/ton said:
Noted, but how and where would you check this? The vehicle is remarkable clean in regards to corrosion. Even down to the fuse panel and relays under the bonnet looking like new, which I know can also be a different issue some p38's suffer with.

if the pollen filter/scuttle has ever leaked then you'll get water in the OBD port eventually

Datatek · Apr 4, 2023

300bhp/ton said:
Noted, but how and where would you check this? The vehicle is remarkable clean in regards to corrosion. Even down to the fuse panel and relays under the bonnet looking like new, which I know can also be a different issue some p38's suffer with.

Corrosion in the OBD port is common, sometimes so bad that the wires actually corrode off on the back.

pwood999 · Apr 4, 2023

Pin 16 is 12V and 4 & 5 are ground. (must be ok, or Nanocom would not power on)
Pin 14 is SRS ECU
Pins 7 & 16 are for everything else, BECM.

BECM can be finicky to connect sometimes, as can HEVAC. Depends if ignition is on or off !!

Nanocom Guide says:

Datatek · Apr 5, 2023

pwood999 said:
Pin 16 is 12V and 4 & 5 are ground. (must be ok, or Nanocom would not power on)
Pin 14 is SRS ECU
Pins 7 & 16 are for everything else, BECM.

BECM can be finicky to connect sometimes, as can HEVAC. Depends if ignition is on or off !!

Nanocom Guide says:
View attachment 285598

View attachment 285596

View attachment 285595

Socket pinouts are:

Pin 1...Grey & Red wire EAS Timer
4...Black Ground
5...Black & Purple Ground
7...Pink & Red Becm connector C255
11..White & light Green Airbag (SRS) ecu
12..White & Pink EAS ecu
14..Yellow & Green Airbag (SRS) ecu
15..Light Green & Red Becm connector C255
16..Brown Permanent 12v+ supply from Fuse 33

DanClarke · Apr 5, 2023

Some of the ECU's you can connect to at any time, while others you can only communicate with when the ignition is on has always been my experience.
e.g. Wabco is only livened up when the ignition is on because its a pre-req for a moving vehicle that needs ABS.

kermit_rr · Apr 5, 2023

DanClarke said:
Some of the ECU's you can connect to at any time, while others you can only communicate with when the ignition is on has always been my experience.
e.g. Wabco is only livened up when the ignition is on because its a pre-req for a moving vehicle that needs ABS.

I'm sure I needed the cruise button lit up to connect to HELLA CC

Doolinjames · Nov 23, 2023

Can u replace ECUs and away u go apart for the becm

Datatek · Nov 23, 2023

Doolinjames said:
Can u replace ECUs and away u go apart for the becm

Engine ECU has to be synced to the BECM

P38A ECU locations

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