ODB2 / ECU Comms Issues

Hi,

had the dreaded air suspension inactive message crop up and the car is now fixed on the normal ride height.

Went to the garage to get it reset (they've done them before) and they couldn't talk to the ECU. Their machine definitely works and they've been able to do these models before.

Kept coming back with a couldn't talke to ECU message. The only ECU that could be read was the PDC.

Is there anything I can check or do to work out where the issue is?

Stressing me out as it's my first RR and it's only a few days since I brought it.

It's a 4.4 v8 (2004) with LPG

Put your location in your profile, someone maybe local who can help....

First off is to check your fuses are all 'A' OK and also remove the dash side panel where the OBD socket is and check the wiring for quality and condition, they have been known to corrode (more so on the P38 - but on the L322 anything is possible)

The rear quarter leaks have been known to affect CANbus Diagnostics (which most of the early L322 most certainly are)

Saint.V8 - Am in Walsall (West Mids) not too far from the Ikea

Hopefully somebody local.

I'll have a look shortly and report back on wiring quality and condition.

How/where do I check for rear quarter leaks? I did look in the spare wheel well and there was no signs of leaks there. All the audio components appear to work well, including the sound etc.

Getting a bit worried this could me a major repair jobbie

If you bought it from a dealer, take it back.

Datatek said:

If you bought it from a dealer, take it back.

Click to expand...

From a private seller

There was a report of a man running jubilantly though Walsall naked waving wads of cash above his head - could be related.

I bought one and had air suspension in active on the dash board bought a new pump new relay still didnt work had it plugged in and guy said cant read the ecu

I took the dash apart on the passenger side where the cup holder is as thats where the ecu is for the eas and to reveal there was no ecu in the car so had to buy one
Bought it took it back to be plugged in and now all is fine with a new pump and rleay aswell
My father has the ranger rover now
Could be worth checking there is an ecu

Cheers Stupot19

Did you have issues reading all ECU's or just the EAS one? The guys I took it to couldn't read any apart from the pdc. When I purchased it I could raise and lower it and it also moved to correct height itself when on motorway. To me this indicates there is an ECU present?

Yes sounds like there is one present as mine didnt do anything at all
And yes they could read everything else on the car apart from the eas ecu

Check all the fuses in the glove box and in the boot thats what they told me to do to check if nothing had blown

jaipal2004 said:

Cheers Stupot19

Did you have issues reading all ECU's or just the EAS one? The guys I took it to couldn't read any apart from the pdc. When I purchased it I could raise and lower it and it also moved to correct height itself when on motorway. To me this indicates there is an ECU present?

Click to expand...

Check all the gubbins in the rear quarter for water ingress and corroded connectors. You need to inspect the connectors very carefully as sometimes pins are corroded off completely.

On the L322's, sports & discovery you need to get the battery volts over 13.5 volts for the diagnostics to work properly. The system will become very unstable if you try to read & clear faults will just the battery power.
Put a charger on the car & try it again.

I used a multimeter and read 12.02v when ignition off and 14.03v with it running.

Would this be sufficient for odb2 Comm's to work?

What fuses (if any) should I check?

Will check again in rear quarter ... Is that on passenger side where the audio gubbins are or the drivers side?

Thanks all

jaipal2004 said:

I used a multimeter and read 12.02v when ignition off and 14.03v with it running.

Would this be sufficient for odb2 Comm's to work?

What fuses (if any) should I check?

Will check again in rear quarter ... Is that on passenger side where the audio gubbins are or the drivers side?

Thanks all

Click to expand...

Voltage is little low, but should be OK.

Datatek said:

Voltage is little low, but should be OK.

Click to expand...

Cheers

We did try using RSW all Comm's with engine running and off but wouldn't connect

jaipal2004 said:

I used a multimeter and read 12.02v when ignition off and 14.03v with it running.

Click to expand...

Either your battery is on the way out - or it requires charging.

StuckAgainSteve said:

Either your battery is on the way out - or it requires charging.

Click to expand...

True, but with 14.03 volts Allcomms should connect

did you check the OBD socket wiring??

Can you connect to the Engine ECU using All Comms??

Have you tried connecting using a generic OBD Scanner to the Engine ECU to prove the OBD Socket??

Saint.V8 said:

did you check the OBD socket wiring??

Can you connect to the Engine ECU using All Comms??

Have you tried connecting using a generic OBD Scanner to the Engine ECU to prove the OBD Socket??

Click to expand...

Sorry to sound stupid but aside from a visual check what else can I do to check the socket?

Or was somebody else who checked for me on All Comm's..... All I remember seeing is the TX light but nothing being received the other way.

I have the android app Torque and the dongle. Can't get that to connect either.

The previous owner left the business card of a land rover specialist from Houghton Le spring so I called him and he said he'd reset the eas fault a few times recently so the port has obviously worked (no faults/messages when I collected the car).

Have done the battery disconnect and reconnect procedure.

What next?

Thanks for all your help guys

Datatek said:

True, but with 14.03 volts Allcomms should connect

Click to expand...

Unless a failing diode pack is sending out dirty power.

StuckAgainSteve said:

Unless a failing diode pack is sending out dirty power.

Click to expand...

Hi mate.... How can I check and where?