2nd Gen Non-Engine/Transmission Just a little help with understanding these codes

[SpicyJam]

I have a 1694 and a 1697 and both relate to "No CCD Messages Recieved From PCM" Can someone break this down a little better for me please? Thanks, trucks runs like a top, just trying to nail down these 2 codes.

 

[Gary - K7GLD]

Either a component problem inside the ECM, or a bad connection in/out of it...

 

[SpicyJam]

So far this is my understanding. The one code relates to the drivetrain, which I can understand since I just put in a new clutch. The other code is a service reminder code. So at this point I am just going to hook up the scan tool and erase and see if they pop back up. I have yet to see any one posting these codes on here, am I a first, if so this sucks... ... ... ... ... ... .....

 

[Gary - K7GLD]

I can't imagine how anything related to a clutch change would cause a code - when I changed mine, my bud helping forgot to plug in the backup light plug - that's the only electrical connect *I* am aware of - and no codes. The service reminder bit seemingly refers to the system not being able to write updated mileage info into the ECM for some reason...

 

[SpicyJam]

OK here is a new one for ya, code 1687. The 1697 is now not present. One question, should the Comp be off when I pull codes?



Also what the he!! is P1687?

 

[Gary - K7GLD]

P1687 No MIC BUS Message No CCD/J1850 messages received from the Mechanical

Instrument Cluster (MIC) module.





No, the Comp on or off shouldn't have any effect - you have a ECM or wiring/connector problem!

 

[SpicyJam]

So big deal, everything in my truck is working. Like I said I am just going to erase them codes and see what happens.