11/10/2022 0 Comments Chevy sonic engine temperature gauge![]() Under normal circumstances you would be right. The preponderance of the evidence indicates the corroded battery terminal was the culprit. The OP also mentioned some other weird things happening which can be attributed to low system voltage. The SM clearly shows the ambient air sensor is involved in the compressor control logic. The BCM provides the voltage source for the ambient air sensor so low system voltage would affect its accuracy as well. However, the Ambient air temp sensor feeds the BCM which interfaces with both the HVAC and the ECM. ![]() The ECM turns the compressor on and off based on several inputs but it isn't clear that low coolant temp is one of the reasons it would not allow the compressor to run. The ECT isn't directly part of the A/C control logic since it only feeds the ECM. That could cause the gauge to drop to cold since the IP gets its data from the BCM which gets it from the ECM. ![]() The ECM provides both power and ground to the ECT which is a variable resistor so when system voltage starts dropping (which is a result of corroded battery terminals) the temp readings are incorrect and since system voltage is low the ECM cannot read them correctly either. OK guys.got it fixed.popped of console panel and checke all fuses and connection to BCM and fuse box.still no gauge or ac.checked all fuses under hood and still no coolant gauge or ac.finally checked the battery and the ground connection was covered with build up.alot.pulled battery teriminals off and cleaned real good.hooked back up and hooray.temp gauge and ac started working.a few questions.I have been noticing lately that the radio would not come on for a minute or two after I started car would want to stall very occassionaly at a red light but never uld this corroded battery terminal caused these issues.and why did the temp gauge and ac only stop working.I am pleased it appears to be fixed but would just like to know for future reference.I am not sure if cleaning or the time I had the battery cable off reset the computer but it is fixed for now and I my wife is happy once again.any more feedback on this is appreciated.Ĭlick to expand.Under normal circumstances you would be right. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |