Following a recent engine rebuild and transmission replacement, I am getting 0447 and 1590 codes upon startup. They both will clear (with my ultragauge) after initial startup and will not reappear during driving. However, after shutting off the Rover, they come back a few seconds after restarting the vehicle.

Ideas on how to address these? Do I need a different device to clear the codes besides the Ultragauge?

 

you need an abs code reader. 1590 is generic for some type of abs issue. sounds like weak signal, but you need a code reader to be sure. it will keep coming back till it is fixed


I think the other is evap canister

 

P1590 is the rough road signal RAVE says;

The rough road signal can fail in the following ways:
* Harness or connector damage
* SLABS failure — wheel speed sensor

A rough road signal failure may be evident from the following:
* HDC / ABS warning light on

Should a malfunction of the rough road signal occur, the following fault codes may be evident and can be retrieved by TestBook:

P1590 - ABS rough road signal circuit malfunction - Hardware is OK, but SLABS ECU is sending an error signal

The other fault relates to the Canister Vent Solenoid (CVS)
P0447 - CVS valve open circuit

 

The P0447 code should be fairly easy to diagnose. It's just a two wire connection to the solenoid. If you back probe the wires, (to be safe, do one at a time), both wires should have 12volts on them. If they do, you can unplug the solenoid and test both sides. One side should have 12v and the other should have 0v. Plug it back in and jump the side that had no voltage when unplugged to ground. That should turn the solenoid on. You'll hear it click back and forth as you ground and un-ground the jumper wire.
Just a guess, judging from the code, if you back probe both sides of the connector with it plugged in, one side is not going to have voltage.
Good luck.

 

P0447 Ended up being a simple fix... The electrical connector wasn't connected to the CVS. Plugged it in, cleared the old code and upon start the code is gone...

Don't know how it got disconnected... I'm sure I did it and just forgot during the engine rebuild...

P1590 Ended up being a simple fix too... unplugged both of the Wheel Speed Sensors to the front wheels and plugged them back in. Cleared the old code and upon start the code is gone...

No more MIL...