Medium and Heavy Trucks
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Thanks for asking your question and requesting me. I will try and help you out.
That is correct. The wait to start is for the intake heater. The heater is controlled by the coolant temp and intake air temp. With it being 80 degrees where you are at. The heater should go off. It should not stay on above 60 degrees. It it is staying on, I would suspect one of the temp sensors are reading wrong and low if the wait to start lamp is staying on. Basically the ECM add the intake air and coolant temp together. When the sum is above 120, it turns the intake heater off.
To verify. You could have the ECM read with a service tool to verify the Temps are correct.
Please reply back if you need more help or have more questions. I am happy to assist.
I see. I am suspecting it is blinking as one of the temps are reading low and it takes 10 minutes to get the temp up enough to turn off the intake heater. Can you see the intake air and coolant temps readings with your tool?
Yes the engine has an intake air temp sensor. The ECM takes the reading of the coolant temp and intake air temp and adds them together. If the sum is below 136 degrees. The heater stays on. If the temp sum is above 136. The ECM turns the heater off.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.