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Discussion Starter #1
1998 4,6 HSE

I have now used 7000 $ on finding out electrical problems. The BECM is overhauled, wiring is repaired and so on…
Yesterday the EAS fault appeared and the rsw solution could not reset it. Put the car into the garage again and their professional diagnose equipment couldn’t communicate with the ECU. What can the problem be?
 

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We'll need more details as to the faults. What it could be- how long is a piece of string.
And there is no point putting a P38 into a garage that doesn't have experience with them.
 

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RBJO said:
1998 4,6 HSE

I have now used 7000 $ on finding out electrical problems. The BECM is overhauled, wiring is repaired and so on…
Yesterday the EAS fault appeared and the rsw solution could not reset it. Put the car into the garage again and their professional diagnose equipment couldn’t communicate with the ECU. What can the problem be?
What do you mean by BECM overhauled?.
Is the equipment the garage uses specifically designed for use on the P38?.General diagnostic equipment will not communicate with the P38,s ECU,s.
If the diagnostic equipment is correct, then the EAS ecu could have failed(which is unlikely) or the wiring from the OBD connector to the ECU is defective.
Are they able to communicate with any of the other ECU,s on the vehicle?

Have you been able to communicate with the EAS ecu using rsw software before you had this problem? :?:
 

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Discussion Starter #5
Comments to the questions:
Yes it is a RR specialist.
Yes they have the RR diagnose equipment.
The BECM have been sent to England for overhaul.
Yes they are able to communicate with some parts.
Yes I have been able to communicate with the EAS ecu using rsw before.
Wiring from the OBD connector have been checked by the garage.

When the EAS fault appeared I bypassed the pump to get it raised. Trying rsw I got all the FF response, but I was not able to start the pump from rsw or depressurize the tank or springs.

Rune
 

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check the 2 white connectors under the Left Front kick-pannel. the pollen filters can leak/drip into this connector, the wires from the EAS to the OBDII plug are in there and murphey's law states that one/both will be corroded/disconnected. Jumper the connector and all should be well.
 

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I had a Serial to USB adapter fail. You get a string of FF's with an occasional EF or FG when it does. But no control at all.
I had another adapter and plugged it in with a result of instant contact and every thing working again in the software.
 
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