9400i Fault Codes

The LCD display doesn't show fault codes. Those are not codes, they are messages which do not translate to any diagnostic information. The LCD display was never meant to be a code reader. You need to get your truck properly scanned.

 

Heavyd, I am having the no data link issue on a 2005 9400i and have removed all old qaulcom wiring/disconnected abs box/checked all fuses and relays/splice packs today I will start to tear into harness can you help with where the J link wires come out of fire wall, and where the ECM connections are cm870 isx400st

 

Datalink wires between the firewall and engine are numbered 98B- and 98+. They are black 18 gauge wires. 98B- comes out of the firewall at cavity S and goes into the ECM at cavity 20. 98+ comes out at T and going in at 10 at the ECM.

 

is it ok to use dielectric grease on the ecm pin connectors ?

 

Yes. Excellent to use that. I use it all the time with any electrical connection, especially at ECMs.

 

yup that did the trick all gauges came back with the data link

 

We have a 2006 9400i with the fault code showing.

092:F02 PID102.A