P0480 Chevrolet -

Question

2002 chev cavalier .. bought with bad head gasket replaced head gasket valve job, new water pump thermostat and temp sensor, have multiple codes . the P0480 .. i cant find the problem for.. even when I turn on the A/C switch fan will not turn on and I am not getting the ground signal from the pcm. jump the terminals for the fan and it runs fine, relay is verified good. also getting a P0530 code. going to meter the harness from relay base to PCM pin... other codes coming up are C1244, C1235, C1275, C1298, U1016, B1000 & B1009.

could use some help on finding the problem.. I dont believe in just changing parts and hoping to be lucking to find the right one.

Thanks for you help!

Answer 1

P0480 Cooling fan 1 control circuit

P0530 A/C pressure sensor circuit malfunction

You found found the problem, if there is no ground command from the PCM test it at the PCM to verify the PCM, It is also good to get to the root cause for P0530. There is a TSB about this code condtion that Chevy has produced, TSB # 02-01-38-003, titled A/C inoperative / Engine surge, .the a/c runs along the 5 volt refference which when it goes low affects the other sensor on its leg. What happens with the connection of the a/c harness is it breaks due to its length being short, Do the P0530 code condtion first before P0480.

Here the wire location for the a/c pressure sensor.harness that tends to break here

 Here a diagram for the cooling fan to test it at the PCM.