N14 celect plus erratic idle

[Luckyjayb]

(08-28-2022 )schISM Wrote:  

(08-28-2022 )Luckyjayb Wrote:  

(08-28-2022 )schISM Wrote:  

(08-28-2022 )Luckyjayb Wrote:  I’m getting the correct ambient air pressure though

I’m not familiar with the N14 but the ambient air pressure is only sourced from the barometric pressure sensor(on an ISX). The ambient temperature is a separate source usually provided by the OEM. So you could have correct ambient air pressure and a malfunctioning ambient air temp. circuit.

Yea I know what you mean on them. This is a 99’ KW W900L. No reading in the cab for ambient air temp. This was live data via insite so it has to be picking it up somewhere.

Ok, so no data to the cab temp tells me the sensor or circuit for temp has malfunctioned. Insite is just passing along the default value(40 degrees) that the ECM uses if there’s no data being supplied by the sensor. Again this may not be the issue for the erratic idle but if everything else has been checked this would be next on my list.

My thoughts and per Cummins schematics, it shows the ambient air temp sensor is Cummins responsibility.