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Hi

In the last summer I brought my 2001 Opel Astra for an ECU reprogramming to disable EGR functions. They did it and since that I have driven 10 000km without problems, but now the engine fault light appeared with an error code 1405 (EGR). :confused:

I reset the ECU by taking off the battery for a couple of minutes. Then tested driving without EGR connected at all, but the engine light went on right away.

Is it that even when EGR disabled in ECU the valve must be connected and functional?

To check whether my EGR is broken or not I tried to check the readings of the valve:
I took the EGR off and measured resistances between wires:
wires A-E for a solenoid about ~6 Ohm (working)
B-D 2.81 kOhm, independent on valve position.
pin C over range (>1 Mohm resistance) with anyone other.

Does anybody know what these values should be like?

How about annual inspection with OBD-check, they might not believe that the EGR is disabled and reject my car because of fault seen in the OBD system?

Thanks for any help available!

Here the photo of my baby:
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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5,025 Posts
I guess that the ECU will still check for a correctly connected EGR valve, and it sounds like the position sensor within the valve is defective. Pin C is the sensor position output, and the reading between this and pin B or D should vary as the valve plunger is opened/closed. The remap that disables the EGR just stops the ECU from opening the valve.
 

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i didnt realise that there was an ecu update to do away with the egr system on the Z16XE engine, i thought it was only on the 8v Z16SE engine. i had the ecu update for this engine and since then no problem.
 
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