07cl733 Posted March 24, 2017 Share Posted March 24, 2017 Hopefully someone can help. I have a forward axle 2000 CH613 with an e-tech 460. It gives a 1-4 MID: 128PID: 171 FMI: Ambient temperature sensor: Current low or open circuit error. Sounds straight forward enough however, neither the dealership, nor I, can locate the sensor or harness. There are holes in the front cross member for it but no bracket. The mechanic said it must exist because it will intermittently flash 79 degrees on his computer. Also, when he unhooked his computer and I went to start the truck it took a great deal of cranking to start it and the throttle was very erratic. It got better as i drove back to the yard and I thought is was ok. I went to start it a couple days later and the same thing happened. any thoughts on either problem would be greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/ Share on other sites More sharing options...
ShawnNicholson Posted May 25, 2021 Share Posted May 25, 2021 Have you located the problem on this CHU613? I have one with the same code, and mack shows it behind a fog light. However it is mounted to the top of the radiator. Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/#findComment-474276 Share on other sites More sharing options...
Joey Mack Posted May 25, 2021 Share Posted May 25, 2021 Shawn, you responded to a 4 year old post,, what is going on with your truck, and we will try to help you...Joey Mack Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/#findComment-474283 Share on other sites More sharing options...
silentworker Posted October 26, 2021 Share Posted October 26, 2021 I also had a similar one, but at home, the ambient air temperature sensor did not work properly, then did not work completely. I did not want to do it myself, I had little experience in it and no time, work, home, family, and so on every day. Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/#findComment-481918 Share on other sites More sharing options...
Joey Mack Posted October 26, 2021 Share Posted October 26, 2021 that sensor takes 5 minutes to replace, its plug in and go... it should be located near the bottom of the radiator, left side... keep in touch..Jojo.. Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/#findComment-481923 Share on other sites More sharing options...
milkao Posted November 9, 2021 Share Posted November 9, 2021 I also had a similar one, but at home, the ambient air temperature sensor did not work properly, then did not work completely. I did not want to do it myself, I had little experience in it and no time, work, home, family, and so on every day. Found the ad service air conditioning installation engineers, came quickly, fixed it, they have already brought their sensors new. Not sure, but write them a letter and share some useful information. Have a good trip, take care. Quote Link to comment https://www.bigmacktrucks.com/topic/49280-ch-ambient-air-temp-sensor/#findComment-482646 Share on other sites More sharing options...
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