Which Bit indicates the COOLING FANS are ON? DataLog From DataMasters.

[bowtie350_428]

This is for a 91 L98 w/ZF6. I have a DataLogs from "TTS DataMasters" but I don't understand what I am reading in the "Status Bit Display" Frame. Can Anyone Tell me what the Following Bits are for? Fan 1 Rqst Fan 1 was On Fan1 PID Fan 2 Rqst Fan 2 Rqst (listed twice in dialog box) Fan 2 PID Cool Sw Mainly what I want to know is which flag indicates the Primary and Aux Fans are ON? I am Trying to diagnose a problem with my Aux Fan. It won't turn on and I suspect ECM. This is link to previous post: http://forums.corvetteforum.com/show...47&forum_id=48 Thanks

[smross33]

This may be a dumb question but did you check the fuse?

[bowtie350_428]

The fans don't have a fuse. But I did change the fusable links when I changed the fan motors. Besides the problem is intermittent. Sometimes the Aux Fan turns on and off rapidly or sometimes just does switch on at all. A blown fuse would not have intermittent symptoms. I already checked the relays by swapping and regardless of which relay I use, it always happens to the Aux Fan.

I suspected the pin connecting the relay wire (Blue/White) to the ECM. But I need to know if I am interpreting the DataLog Correctly.

When I read the DataLog, bit “Fan 2 PID = 1” and “Fan 2 Rqst = 1”. The way I interpret this is the ECM is sending the signal to the Aux Fan relay to turn "ON". Am I interpreting this Correctly?

[Corvette86]

Slave in a wire from the ECM and see if the problem goes away.

Frank