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I have a P0118 fault code on my 2006 tundra, but i have

Customer Question
checked the senor and the...
i have a P0118 fault code on my 2006 tundra, but i have checked the senor and the reading is correct also with the senor disconnected the reading is -40 and jumped-out 284 degf I do not have a check engine light the only indication there was an issue the temp gauge is showing a low temperature
JA: Does the light stay on, or does it blink?
Customer: which light... the check engine did not come on
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I have checked the temp reading in the ECM with the sensor connector disconnected and jumped out and the reading are good but the temp gauge is incorrect
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Toyota Mechanic about your situation and then connect you two.
Submitted: 1 year ago.Category: Toyota
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Answered in 7 minutes by:
7/9/2016
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago
david craig
david craig, Auto Mechanic
Category: Toyota
Satisfied Customers: 4,491
Experience: owner/mechanic at 3D Automotive
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Hi I'm Dave,here
P0118 - Engine Coolant Temperature Circuit High Input
Possible causes - Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat P0118 Description The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature.

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Customer reply replied 1 year ago
Dave, I have checked these possible causes.....I am puzzled by this .....when I connect my OBD-II scanner the temp reading value in the ECM is correct but the temp gauge is reading a very low temp even when the engine is at 180 degf
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok, let me check. there might be 2 sensors. 1 for the gauge and i for the computer.

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

4.0 or 4.7?

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Customer reply replied 1 year ago
4.7
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok it only has 1 sensor. have you tried replacing the thermostat?

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Customer reply replied 1 year ago
I replaced the thermostat
Customer reply replied 1 year ago
according to my ODB scanner the engine temp is actually 184 degf when running
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

what degree thermostat did you put in.

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Customer reply replied 1 year ago
180
Customer reply replied 1 year ago
that was OEM part
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

what temp reading is the gauge showing at the middle hash mark?

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Customer reply replied 1 year ago
no it is showing at 5 o'clock ...normally it would show at 3 o'clock thats how I noticed something was wrong
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

but is there is degree mark at 3 o'clock? like 180 or 210?

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Customer reply replied 1 year ago
no is just "C" at the bottom and "H" at top
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

ok. well if it aint too much of a pain. put some heat on the sensor and see what the gauge does.

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

and if you have a digital temp gun, compare the temp where the sensor go into the engine and the gauge or the scan tool

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Customer reply replied 1 year ago
i heated some water to 180 degf and placed the sensor in water the ECM reading is 179.1 but the gauge is between 5 & 6 o'clock
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

lets do a wiggle test of the wiring to the sensor and see if the gauge jumps...also make sure the sensors connector has a good ground

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Customer reply replied 1 year ago
done that I have wiggled every wire and harness under the hood
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

how about the ground for the connector? it should read no more than 0.2 ohms

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Customer reply replied 1 year ago
connector has good ground .1 ohms and the supply is 5.1 VDC
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

in my opinion it has to be the instrument cluster then. you can also try a 195 degree thermostat to bring it to 3 o'clock

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Customer reply replied 1 year ago
does the temp gauge get its signal from the ECM or directly from the sensor
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

directly from the ecm

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Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

Here is what the circuit does. The (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set.

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Customer reply replied 1 year ago
I sure it is VDC do you know the voltage range of the gauge.
As a side note I am surprised that the PCM sees this fault and does not turn on the check engine light
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

dont know the voltage range my friend. and its only supposed to set a code. now if there was a fault with the ect and thermostat operation it would turn on the light

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Customer reply replied 1 year ago
39;If the ECT reads less than freezing temp when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code", but the PCM is not seeing a freezing temp according to my scanner....when the engine starts I have a temp of 89 degf today.
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

im thinking it means less than what it should read

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Customer reply replied 1 year ago
89 is well above freezing if thats what triggers the fault......I believe I read that the fault is generated when the voltage is below .15 and above 4.91 for some time on start up......which would not be the case if the PCM has a value of 89......it makes no since to have the P0118 fault code
Toyota Mechanic: david craig, Auto Mechanic replied 1 year ago

looks like you're going to half to pull the instrument cluster and do a continuity test between the gauge and the ecm. point to point then to ground

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