I charged the battery and cleaned all terminals today, but the codes are still popping up on the dash.....
Even a brand new battery might not hold enough power under load to properly drive the DPS, cos it is so power hungry; so just 'charging' your old battery may not be enough - you really need to get it load tested to see if it's properly up to the job still.... and you still need to do that even if it
IS brand new!! :shocked:
And it's not usually the
battery terminals that are the issue in this particular instance - while it
can be the battery terminals themselves (so cleaning them & checking their tightness wasn't necessarily wasted
) it's more often a poor earth where the negative cable from the battery is bolted onto the chassis - the flange on the end of the cable needs to be checked to ensure it's clean, shiny, & has a tightly fitted soldered connection onto the end of the cable; and then the flange itself needs to be cleaned and firmly affixed to a clean bright spot of metal on the chassis!! If any one of those things isn't clean & tightly affixed with bright clean metal mating firmly to bright & clean metal, then current draw can be significantly restricted and the DPS may not work, giving you those codes!
In my case, it was a
brand new load tested & confirmed 'good & load capable' battery with new & bright terminals & securely fitted cables on those terminals that continued giving me DPS Issues & returning those codes; but it was actually the bolt holding the negative cable onto the chassis alongside the DPS in the 'tunnel' that the steering arms run thru that was the real culprit.... the bolt was juust a touch loose; the flange was juuust a little dirty & oxidised; and rust was juuuuuust beginning to form on the chassis where the flange was meant to be firmly seated!
That was all that was causing the DPS failure issues & those codes; so it was only by checking, pulling, & cleaning the flange itself; cleaning the metal where it bolted onto the chassis; then firmly bolting the flange back in place that actually finally solved the problem. :banghead: Yes, it was a right pain to reach in there and get it all done; but doing that was a helluva lot cheaper than replacing the DPS - and even if I
HAD replaced the DPS, if I fitted the new unit without doing that 'clean everything & tightly fix it all back in place' job, there was a very good chance that the codes AND the DPS Failure wouldn't have been resolved anyway! :gaah:
Still, maybe it
IS just a dud DPS, but I'd hate to fork out the $$ for a new one only to find out the problem was really just an old & tired battery (that could still hold more than 12 volts, but had no load capacity in use?!? :sour: ) or that it was a loose &/or dirty flange connection on the chassis for the Earth cable all along tho!!
Good Luck! :cheers:
) a tired battery &/or a dodgy earth somewhere could well be causing or at least contributing to those codes & your issues; so maybe you should make absolutely sure your battery is in top nick (replaced it recently??) & make sure all the earth leads are securely affixed onto clean, rust free metal?! :dontknow: This could well be resolve ALL your DPS issues, but even if it doesn't, you will have removed those potential causes and clearly identified exactly what you need to do to finally sort it!! :thumbup: And yeah, the DPS isn't really serviceable - if it's not doing its thing, your only real option is a 'repair by replacement' of the whole (expensive) DPS unit!! :gaah: 
pps: So there's probably another chassis earth point or two that will need checking. 
