hey everybody, my names Will and im experiencing a p0603 code with my Infiniti, code is for the Keep alive memory not being stored. Has anyone else experienced this problem? My battery and charging system are testing good, ive been chasing grounds and everything seems fine. Bad ECM? Also i dont have any mods on the car, its stock.

 

Disconnect the battery, unplug the ECU harness, reconnect the battery, probe pin 93 to make sure it has battery voltage, wiggle it around to make sure it's not just a bad pin.

 

 

Umm the one that looks like the picture above....

Sorry I couldn't resist, I believe it's the biggest one for the ECU but I might be wrong.

 

Ill double check the 3 connectors in the morning when I looked at them earlier none of them seemed to match up with that diagram.

 

I appear to have no volts at pin 93. next step to check the E12/F3 connector. Can someone lead me in the direction of where this connection is?

 

I doubt it's the F3 connector, that's the upstream O2 sensor on bank 1.You probably meant harness E3/F1 which is a big wire-to-wire harness behind the IPDM which is usually NOT the problem but it is fed from the IPDM 15 amp fuse in slot 50 which you SHOULD check.

 

having same issue did you resolve and how