No comms with EAS ECU

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customknight

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Ive decided to start a new thread about this issue as it now become a slightly different problem to the original post.

A bit of history. Bought the OBD lead, USB adaptor and EAS Unlock software from eBay (although the software was freeware). plugged it into my windows 7 machine and no comms. Tried everything including a fresh install of windows XP on another laptop using the serial port for comms. Still nothing.

Today my friend came over in his 4.0SE '98 and we hooked up the same windows XP machine using the serial port for comms and hey presto, it communicated fine first time. Not good for me.

Do these vehicles have history of frying their EAS ECU? It WILL NOT communicate at all with my car, I've given up trying.

I want the EAS but i'm not prepared to go through a nightmare to get it working! I've already had that with the engine!!
Will getting a second hand EAS ECU eliminate any problems?

Would it work if i was to swap out a known working ECU and put it into my car to see if the PC will speak to it?

Could really do with DATATEKs opinion on this. :(
 
If it has a bypass that involves overriding the BeCM (an add-on loom) it'll stop you communicating with the EAS ECU. You'll need to disconnect that and put everything back to original.
 
I assume it hasn't as I'm still getting the SLOW:35MPH on the dash. Plus all the wiring looks original as it is.

Please bear in mind that I bought it with the EAS disconnected at the ECU and manual shrader valves on it.

The previous owner told me it was due to the RR rising and then fallig on one corner immediately. It then went to the dreaded 4x4 'Specialist' in the local area and came back manual, well half manual!

It has 4 new bags and a new compressor too. I'm just wondering if the original fault was caused BY the bags being changed and the axle wasn't supported causing the height sensor to be pulled out of normal operating range, which apparently can damage them. Then this 'specialist' got at it and buggered it up!
 
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If he is as bad as you say, he could've installed the loom incorrectly. My P38 came with coils (I know, what a noob) and while I was putting it back to air I noticed that the bypass loom wasn't installed correctly which caused the SLOW: 35MPH MAX (I brought a P38 with faults? What an uber noob) message. With that loom in place I couldn't communicate with the EAS ECU.

I suspect if they just hotwired the BeCM that'd still prevent it talking to the ECU.
 
Check the OBD socket on the car for corrosion....oftentimes, the wiring to the pins on the connector corrode away....

Datatek will be able to tell which pins are for the EAS ECU, but unscrew the OBD and take a goosey!
 
The EAS ECU is one of the few reliable bits. Look for corrosion on the OBD connector, also go to the EAS ECU connector under the passenger seat and look for any links between pins that should not be there. I assume the timer relay is there?

OBD II SOCKET PINOUTS



Pin 1- (Grey & Red) EAS Timer

Pin 4- (Black) Ground

Pin 5- (Black & Purple) Ground

Pin 7- (Pink & Red) BECM (Socket C 255)

Pin 11- (White & Light Green) EAS ECU

Pin 12- (White & Pink) EAS ECU

Pin 13- SRS? Not shown in RAVE

Pin 14- (Yellow & Green) Airbag ECU

Pin 15- (Light Green & Red) BECM (Socket C 255)

Pin 16- (Brown) 12V+ Feed via 5A fuse (F 33)

Wire colours not confirmed.
 
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Thanks for the info! Ok so where is the timer relay and what does it look like?

Ill check for corrosion tomorrow as I'm not in the Rangey today.
 
You mean the look at the EAS ECU? Just taken a look at the obd connector and it looks fine, no corrosion although water has been getting in but nearer to the door. I'm going to wd40 it and see if that helps.

The eas acu wiring is stock, there are no links between any of the wires, and yes I've dismantled the plug.

I have a guy sending me some eas ecus to see if the original has been fried by some incompetent idiot.

Is anyone with any knowledge of this system local to me to come take a look?
I'm getting a bit tired of trying to work something out which i don't understand. :(
 
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customknight said:
You mean the look at the EAS ECU? Just taken a look at the obd connector and it looks fine, no corrosion although water has been getting in but nearer to the door. I'm going to wd40 it and see if that helps.

The eas acu wiring is stock, there are no links between any of the wires, and yes I've dismantled the plug.

I have a guy sending me some eas ecus to see if the original has been friend by some incompetent idiot.

Is anyone with any knowledge of this system local to me to come take a look?
I'm getting a bit tired of trying to work something out which i don't understand. :(
Click to expand...
NEVER use WD40 on connectors, use contact cleaner.
Check the white connector behind the side panel in the passenger footwell for corrosion.
 
Ok advice noted. I've taken the obd plug out of the panel and inspected it but I simply cannot see into the pin holes to look for corrosion.
I've tried again to establish comms but no joy.
The obd code reader I have communicates fine and return errors or no errors when connected, but this was wont do anything.

Any more advice?
 
Just inspected the timer relay and inside there is a 5a relay. I touched it and it's very hot. Is this normal? This is with the ignition off and the system connections as stock. No obd connection. Just as it came from the factory!
 
customknight said:
Just inspected the timer relay and inside there is a 5a relay. I touched it and it's very hot. Is this normal? This is with the ignition off and the system connections as stock. No obd connection. Just as it came from the factory!
Click to expand...
I would not expect the relay to be hot, with the ignition off the system should be asleep except for the 6 hourly wake to level.
Did you check the connector behind the passenger kick panel by the a post? It's a common failure item due to water ingress and corrosion.
 
No I didn't, sorry. I thought you meant the obd. Ill check it tomorrow. What kind of connector is it? Big, small, lots of wires or just a few?

Thanks for all this help. This is a brain frazzler.

Well it was hot, and I would say excessively hot for a 5a relay. Like its been active a lot. :confused:
 
customknight said:
No I didn't, sorry. I thought you meant the obd. Ill check it tomorrow. What kind of connector is it? Big, small, lots of wires or just a few?

Thanks for all this help. This is a brain frazzler.

Well it was hot, and I would say excessively hot for a 5a relay. Like its been active a lot. :confused:
Click to expand...
It's a white connector with several wires.
 
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