Question about 2002 Mitsubishi Montero

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My obd2 is showing me a code p0118 engine coolant temperature circut high input

I changed the temperature sensor and I still have the problem, my temperature gauge is still in high position. My radiator and coolant are not overheating the fan is work as well. Is there anything i should check or change before I go to the service? Thank you for any help.

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my obd2 is showing me a code p0118 engine coolant  - d220d27.jpg this is the coolant temp sensor, it sends a signal to the engine ECU
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this is the temp sending unit. it sends a signal to the gauge on the instrument panel.
this is what you need to get to fix your temp gauge.

Posted on Oct 15, 2008

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You need to replace the circuit board behind the speedometer part number MA532787 (control module) $213.38 and then take it to speedo tach repair ant have the odometer reset about $75.00

Posted on Aug 29, 2011

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Posted on Jan 02, 2017

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1 Answer

Temp guage not working 1999 alero


One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

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Trouble codes p0118 temperature po118


code p0118 refers to engine coolant temperature (ETC) sensor ---circuit malfunction===causes---coolant thermostat---wiring open circuit/short to positive---wiring short to ground---ground wire defective---ECT sensor.. The temp gauge works off a temperature sender unit separate to the coolant sensor and if it is reading 100 then it indicates an overheat situation in the engine . Probably why the engine light is coming on. As the thermostat is in the list of causes I would replace it as a precaution. The coolant sensor is what tells the CPU to turn on the electric fans to cool the radiator

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Temperature guage not working and engine overheated when stopped in trafic


The powertrain computer turns the fans on through the cooling fan relays, based on information from the coolant temperature sensor. The fans will only come on when the coolant temp. is pretty high-varies by manufacturer, but it is over 200 degrees, some as much as 230 degrees. So the fans will not come on when engine is started, but they should come on before the engine overheats. You should have them checked. Also find out if the temp. gauge sending unit is separate and different from the coolant temperature sensor-on most cars, they are separate, maybe not on yours?
Free advice from a shadetree-not worth a lot, eh? lol.

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On my 2003 Dodge Neon SXT I need help with a couple of things. (1) I need someone to send me a diagram showing exactly where the coolant temperature sensor is and where the oil pressure sensor is. (2)...


2003 Dodge Neon (non-Turbo)

The coolant sensor threads into the rear of the cylinder head, next to the camshaft position sensor. New sensors have sealant applied to the threads.

The ECT Sensor is a Negative Thermal Coefficient (NTC), dual range Sensor. The resistance of the ECT Sensor changes as coolant temperature changes. This results in different input voltages to the PCM. The PCM also uses the ECT Sensor input to operate the low and high-speed radiator cooling fans.

11_21_2011_4_58_53_am.jpg

The combination coolant temperature sensor has two elements. One element supplies coolant temperature signal to the PCM. The other element supplies coolant temperature signal to the instrument panel gauge cluster. The PCM determines engine coolant temperature from the coolant temperature sensor.

As coolant temperature varies the coolant temperature sensors resistance changes resulting in a different input voltage to the PCM and the instrument panel gauge cluster. When the engine is cold, the PCM will provide slightly richer air-fuel mixtures and higher idle speeds until normal operating temperatures are reached.

The PCM has a dual temperature range program for better sensor accuracy at cold temperatures. At key-ON the PCM sends a regulated 5-volt signal through a 10,000-ohm resistor to the sensor. When the sensed voltage reaches approximately 1.25 volts the PCM turns on the transistor. The transistor connects a 1,000-ohm resistor in parallel with the 10,000-ohm resistor. With this drop in resistance the PCM recognizes an increase in voltage on the input circuit.

Oct 11, 2011 | Cars & Trucks

1 Answer

Equniox have changed thermosate and coolant sensor and no leak still running hot


There are several things that can cause an engine to overheat. This is why the problem should be DIAGNOSED before spending a bunch of money replacing parts. You can go broke replacing parts and never fix the vehicle.

First, is your radiator cooling fan working? If not, then you must diagnose the cooling fan and cooling fan circuits to find out why.

Did you replace the coolant sensor for the computer or the one for the gauge? (Yes, there are two engine coolant temperature sensors) This brings us to the next question:

Are you sure the engine is actually overheating or is it possible that the gauge could be "lying" to you?
The actual engine temperature should be taken with an infrared thermometer to see if it agrees with the gauge.

When you changed the thermostat and the temp sensor, did you bleed the cooling system properly? There may be air trapped in the engine.

Has the engine been checked for a possible blown head gasket? If it has overheated at all, it is highly likely that you may have a warped cylinder head and/or a blown head gasket.

Is the water pump circulating the engine coolant like it is supposed to? You could have a damaged water pump impeller or a clogged radiator keeping the coolant from circulating properly.

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1 Answer

Temperature guage goes to high, but it doesn't appear that the van is overheating (no steam/fluid leaking) Radiator & thermostat were recently replaced. Guage will jump to high when idle, but...


FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.

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Changed the thermostat on a 1994 Corsica 2.2 4 cylinder because the gauge was moving from the 1/4 position to 1/2 of temperature range. What do you think could be causing this swing in temperature


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It sounds like the coolant temperature sensor is beginning to fail. It is highly unlikely that the in-dash gauge is a problem. The coolant temp sensor inputs to the computer affecting everything from radiator fan speed, engine fuel/air calibration and a variety of other parameters.

Be absolutely certain to "burp" every bubble of atmosphere from the coolant system too. Air bubbles have the amazing ability to prevent coolant flow and will cause all sorts of problems, especially if the bubble wants to hang around the temperature sensor location.

Normal operating temperature is going to be around 210 F.

Most Autozone, Advance locations will read engine problem codes at no charge, so drop by one of those locations and let them read the problem code.

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It could well be a faulty thermostat- test or replace same.
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1 Answer

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Faulty temperature sensor I think, thats what feeds the gauge. If the vehicle is genuinely running hot there would be a lot of pressure in your radiator causing overflows/steam/coolant smell.
Those sensos wear out and commonly go to short which shows a higher & higher reading until they fully short out
...hope that helps.

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