there is an ongoing problem with po 1/2 nissans the steering transistors (igbt) blow and take the card with them.you can usually see blown components on the top right hand side.when you replace the igbt it only lasts ten minuits.i have sent several cards for repair with mixed results.new card in the uk is about £2000 retail!
also the current limit and steering effort should be reset to 85%

trina m can u send your email for more info 8)

When changing any transisters on a PO2 you have to run the self test, before firing her up to see if the card is toast, or you just might of blow the new transisters :)

I also have a truck with similar problem. I have power steering to the left, but not to the right. I have replaced both SCRs, tested the motor for operation both directions, checked the potentiometer in both directions, and I get codes 514 (PS-TR), 526 (PS-C SENSOR), and 531 (OPEN/V.UNDER). I have Hitachi board GD004397-1.

ash n
We have a very good company call flight systems in Canada that repairs all electronic cards and components.He said the power steering problem have two parts 1)power transistor has to be clean 2) printed crt board.The transistor check out O.K Know the board has to check out
still.I wonder how the power steering and traction problem occured?

Hi,LOGIC
what the type of your speed controller,
Is it based on HITACHI logic card with P.N. SCEN3 - 1211
reply, please