KJINTF
Junior Member
Sure hope someone can help me with this one, it's driving me $#$#% CRAZY
The outside temperature display on the CMTC is most of the time stuck at 32F but sometimes goes to -40F. This issue only just started up a few weeks ago. The truck runs great with no other issues
Replaced the Temp sensor with NO Change to the issue, checked the wiring all OK
Did the CMTC Diagnostic with the button press key turn thing and with my DRBIII both passed. Additionally the other display data on the overhead display works as expected.
Using my DRBIII I can clearly see the PROPER voltage and temperature as a PCM sensor input which varies with outside temp and matches and external thermometer. I believe my NGC system does not use the FCM interface to the Ambient temp sensor as many do. Checked the wiring from the sensor it does not go to the IPM / FCM.
Removing the ambient sensor from the connector causes the A/C Condensor fan to come on and creates a PCM DTC along with -40 reading as a PCM sensor input and display on the overhead.
The truck details
2003 Dodge Ram 2500 Quad cab 5.7l Hemi WB 4WD ST
PCM NGC Part # 56028773AF.03 Type: NGC2 3E07V05.0
CMTC Part # 56045573AF
The outside temperature display on the CMTC is most of the time stuck at 32F but sometimes goes to -40F. This issue only just started up a few weeks ago. The truck runs great with no other issues
Replaced the Temp sensor with NO Change to the issue, checked the wiring all OK
Did the CMTC Diagnostic with the button press key turn thing and with my DRBIII both passed. Additionally the other display data on the overhead display works as expected.
Using my DRBIII I can clearly see the PROPER voltage and temperature as a PCM sensor input which varies with outside temp and matches and external thermometer. I believe my NGC system does not use the FCM interface to the Ambient temp sensor as many do. Checked the wiring from the sensor it does not go to the IPM / FCM.
Removing the ambient sensor from the connector causes the A/C Condensor fan to come on and creates a PCM DTC along with -40 reading as a PCM sensor input and display on the overhead.
The truck details
2003 Dodge Ram 2500 Quad cab 5.7l Hemi WB 4WD ST
PCM NGC Part # 56028773AF.03 Type: NGC2 3E07V05.0
CMTC Part # 56045573AF
