coolant temp sensor
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coolant temp sensor "ac turned off for engine protection" engine code came on for coolant sensor reading high. plugged in pcm reader and it showed 168° which is accurate and the engine bay was warm obviously but not too warm. I cleared the code and put the heat on all the way just in case. any ideas?
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Teching In
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Thread Starter
Teching In
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Thread Starter
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update so it's been awhile since it did it. but I just caught it doing it again. I notice the coolant temp guage drops all the way down and say a/c off for angina protection. I'm so confused as to why it would do this. thoughts? new coolant temp sensor too.
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Joined: Mar 2017
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From: Peachland, NC
If the needle is in the normal range and then swings quickly to the extreme (cold or hot) but the engine is still at normal operating temp, then it is usually one of two things. First, either a bad harness or loose connection. Most gauges usually measure resistance to ground. If it loses continuity either from a broken wire or a loose connection, it will go cold. If it shorts to ground it will show hot.
Second thing and maybe the more likely cause is low coolant. Have you had to add coolant lately? Got any leaks? What happens is that a pocket of air gets trapped in the cooling system and sometimes will move around. If the sensor is submerged in the coolant like it is supposed to be it will give a reading but if the sensor happens to get uncovered by the air pocket, it will read cold.
The DIC code is probably set by the computer because it is not seeing the temp reading in the range it is looking for. Fix the gauge issue and I think this will self-correct.
Second thing and maybe the more likely cause is low coolant. Have you had to add coolant lately? Got any leaks? What happens is that a pocket of air gets trapped in the cooling system and sometimes will move around. If the sensor is submerged in the coolant like it is supposed to be it will give a reading but if the sensor happens to get uncovered by the air pocket, it will read cold.
The DIC code is probably set by the computer because it is not seeing the temp reading in the range it is looking for. Fix the gauge issue and I think this will self-correct.
Thread Starter
Teching In
Joined: Sep 2023
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If the needle is in the normal range and then swings quickly to the extreme (cold or hot) but the engine is still at normal operating temp, then it is usually one of two things. First, either a bad harness or loose connection. Most gauges usually measure resistance to ground. If it loses continuity either from a broken wire or a loose connection, it will go cold. If it shorts to ground it will show hot.
Second thing and maybe the more likely cause is low coolant. Have you had to add coolant lately? Got any leaks? What happens is that a pocket of air gets trapped in the cooling system and sometimes will move around. If the sensor is submerged in the coolant like it is supposed to be it will give a reading but if the sensor happens to get uncovered by the air pocket, it will read cold.
The DIC code is probably set by the computer because it is not seeing the temp reading in the range it is looking for. Fix the gauge issue and I think this will self-correct.
Second thing and maybe the more likely cause is low coolant. Have you had to add coolant lately? Got any leaks? What happens is that a pocket of air gets trapped in the cooling system and sometimes will move around. If the sensor is submerged in the coolant like it is supposed to be it will give a reading but if the sensor happens to get uncovered by the air pocket, it will read cold.
The DIC code is probably set by the computer because it is not seeing the temp reading in the range it is looking for. Fix the gauge issue and I think this will self-correct.
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Teching In
Joined: Mar 2017
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From: Peachland, NC
With multiple electronic issues like that it could be a ground. Lots of circuits share common ground points so a poor connection there could cause multiple problems. There is also a possibility of rodent damage. Sometimes mice will chew harnesses causing all kinds of havoc.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
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Verdad Gallardo Thread Starter
Teching In
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With multiple electronic issues like that it could be a ground. Lots of circuits share common ground points so a poor connection there could cause multiple problems. There is also a possibility of rodent damage. Sometimes mice will chew harnesses causing all kinds of havoc.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
Thread Starter
Teching In
Joined: Sep 2023
Posts: 22
Likes: 1
With multiple electronic issues like that it could be a ground. Lots of circuits share common ground points so a poor connection there could cause multiple problems. There is also a possibility of rodent damage. Sometimes mice will chew harnesses causing all kinds of havoc.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
As far as the oil pressure, the sensor has a filter screen in the passage that is easily overlooked when the sensor is changed. It can become partially clogged, causing the light to come on intermittently.
