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    Renault /Scenic /2002 /1.9DCi /FQ9 732/Bosch EDC Archived Message

    Posted by Christopher Taylor on November 27, 2008, 2:09 pm

    This Renault has me beaten. No drivability problems or excessive smoke but reoccuring fault codes and MIL on.
    Fault codes 1813 Main relay (switch point too late) and 1814 EGR valve (CO positive loop difference "Autodiagnos",deviation KTS).
    I can find no fault with the EGR valves' operation, signal or mechanical operation during actuator test. Tried a new main relay. Airmass output seems acceptable on my scope. Feeds to EGR test OK.
    Stranger still, if I clear the fault memory and start the engine without cycling the key the fault does not occur. The ECU decides it is not happy on the next restart and only then does it flag the DTC's.
    This system does not use a lift sensor in the EGR valve. There are only two wires to the EGR, feed and switched earth.
    Any ideas?

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