Temperature reading is not correct

If you are having a problem with the fuel gauge and temperature gauge on your Toyota Hilux 2KD, there could be several possible causes. Some potential reasons for this issue include:

• A faulty or damaged cluster: The cluster is the instrument panel on your vehicle that houses the gauges and displays important information such as the fuel level and engine temperature. If the cluster is faulty or damaged, it may not be able to accurately display the readings from the gauges.
• A faulty or damaged fuel level sensor: The fuel level sensor is responsible for measuring the amount of fuel in the tank and sending that information to the cluster. If the sensor is faulty or damaged, it may not be able to accurately measure the fuel level and the gauge may not display the correct reading.
• A faulty or damaged temperature sensor: The temperature sensor is responsible for measuring the engine temperature and sending that information to the cluster. If the sensor is faulty or damaged, it may not be able to accurately measure the temperature and the gauge may not display the correct reading.

In order to diagnose and fix the problem, it is recommended to have the vehicle assessed by a qualified mechanic. They will be able to diagnose the specific cause of the issue and recommend the appropriate repair. It is important to address any issues with the gauges on your vehicle promptly, as they can affect the safety and performance of your vehicle.

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The Autodata fuel injection manual provides those figures for the engine management temp. sensor and I think I have seen them in the Haynes repair manual.

The temp. gauge sensor values I have never seen because it is generally accepted the electrical temp. gauge isn't a gauge but an indicator and therefore doesn't need to be accurate.

If you had the correct figures it is a bit of a faff suspending the sensor and an accurate thermometer in cold water and heating it slowly and monitoring the temperature and resistance. Mostly a replacement sensor is so inexpensive it isn't worth the effort.

Ford used to supply different sensors so the gauge (indicator) could be calibrated more closely - so it was around halfway at normal working temperature, but Ford seemed to be the only one that needed calibrating...

In the case of incorrect reading that isn't corrected by a replacement sensor, the supply voltage to the gauge should be checked to ensure it is being regulated accurately to the correct voltage - I know of only two standard voltages (10 volts and 5 volts) but there might be others.

There are several methods. You can use the dash gauge but it is not accurate. The other ways are to use an infrared thermometer, an OBD reader, or manual gauge in the coolant

Sometimes bad temperature readings can be corrected by cleanning ground connections at the battery, chassis ground, engine ground and instrument cluster ground.

Hi Dale. Look under the front bumper either on the left or right trim panel. The trim panels are triangle in shape. An outside temp sensor usually sits in this area. The sensor may be missing. BMW has the sensor, wire, and connector available sperately if they are missing or damaged. It will cause the outside reading to be -40 and can cause the a/c compressor not to operate.

I would recommend checking the coolant level in the radiator while the engine is cool. If the coolant level is low, the temperature gauge will not function properly and can read cool even though the engine is actually overheating. The cooling system should be checked for proper operation using a scan tool and an infrared thermometer to verify that:

1. The thermostat is opening at the correct temperature
2. The coolant is flowing through the radiator correctly
3. The engine coolant temperature sensor is providing accurate data to the engine control module.
4. The electric radiator cooling fans are turning on at the correct temperature

If there are any problems found by checking the 4 items listed above, further diagnosis may be needed to locate the actual CAUSE of the problem.

It certainly could be the sensor and it is mostly cheaper and easier to replace it as a first step.

Bear in mind the temperature gauge can only be reasonably accurate if it is supplied by the correct stabilised voltage and sometimes the instrument voltage stabiliser does cause problems...

check your grounds

The needle on the dash gage can be pulled off and slipped back onto the stem of the gage. First get an accurate temp gage to be sure what the engine temp is operating at. Then remove the face of the dash gages and remove the needle and place it back onto the stem to reflect the current correct engine temp and you should be good.