Po540

[BillMoncrief]

Hello all;
I have a code PO 540. I have checked for voltage at the intake air heater and have none. The Mega fuse shown in the owners manual is good. So I would assume it is something down stream from there either a relay or possible inline fuse? Any help would be appreciated.
Thanks
Bill Moncrief

[More Power]

A Tech II scan tool can be used to activate the IAH, which is useful for troubleshooting. Since the fuse is OK, I'd check for power at (through) the fuse. If power is missing, it may be the relay....

Jim

[BillMoncrief]

Hello All;
MorePower thats what I'm after which relay is it? There is power on both sides of the fuse with the key on or off.
Thanks
Bill Moncrief