How to do a KOEO test?

SCDIAMOND

Registered User
Problem fixed fan works now but the car is still running hot

Can anyone explain how to perform a Key on Engine off test. What tools are needed?

My fan is not working and I have changed the ECT and checked and cleaned all of the connectors. I think the IRCM is not working,

Is there a way to test the IRCM without just replacing it.
 
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just to test that the fan motor isnt bad, unplug the ect sensor while the engine is running. the fan should come right on.

if it doesnt come on, then it may be the fan motor itself or the IRCM.

can you get a code scanner from a parts store? best $30 i ever spent.
 
tried that

I unplugged the ECT and nothing no fan. I think its the IRCM but I won't to know if there is test to perform on the IRCM to know for sure. I will look into the Code scanner?
 
Fixed

I fixed the fan. The fuse able link wire was broken by the battery. Clean the connector and used a button connector to fix the wire and now the fan comes on and off. The car is still run hot so I will continue to troubleshoot that issue.
Thanks for the fast reply.
 
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