Diesel additive function fault,P1434 and 1435 multiplexed pump fault no coms with additive ecu, checked wiring upto bsi unit and replaced additive tank with new item and filled with new fluid. Using dec3 to reset parameters for levels in egine ecu but cant clear above codes.Live and earth all check ok.Is the pump controlled by the bsi unit?The customer has 3 vans all same age that have had same fault for some time all high mileage vehicles.Has anyone come across this fault?Suspect fault in bsi.

thanks

Colin

not sure if this will help,had the same issue with citroen C4 & it was the wiring connector above the rear axle corroded close to additive pump box HTH

Hi Keith
The harness seems to go straight into the cab just above the fuel tank.Thanks anyway.

Colin

Hi
The new additive pump needs to be configured to the ecu, I have had the same fault I tried to code it with my snap on solus but didn't work, but the customer took it the dealers and they coded it in for him.

Thanks