How to solve the Citroen Sena P0118 fault code

Fault code :p 0118

Chinese meaning: engine coolant temperature sensor 1 circuit high

Category: Fuel or air.

Meaning in detail: The engine coolant temperature (ECT) sensor transmits the temperature of the engine coolant to the electronic control unit (ECU) in the form of an electrical signal through the principle of thermistor, as a basis for correcting fuel injection and ignition. This fault code appears if the ECU detects that the engine coolant temperature (ECT) sensor signal is higher than the maximum value of the self-test (volts or -50 degrees Celsius).

Causes of failure include ECT sensor short-circuit to positive electrode, sensor failure, electronic control module (PCM or ECM) failure, etc.

Hello, this fault code means that the engine coolant temperature (ECT) sensor 1 circuit is high, you can check whether it is a problem with the temperature sensor.

Fault code P0118 refers to the engine coolant temperature (socks state ect) sensor 1 circuit is high, if there is such a staring obstacle, first check whether there is a problem with the circuit, replace a coolant sensor.

P0118 Fault Code: It refers to the high input of the engine coolant temperature circuit and the failure of the water temperature sensor. Start by moving or shaking the relevant line cherry pin bundle or plug-in; Wang Song is like a damaged water temperature sensor, the water temperature sensor needs to be replaced, trapped on the engine drain, under the ignition coil.

The solution to Citroen P1621 fault code is that when the car is troubleshooting, it is often necessary to clear the fault code. When clearing the fault, it is necessary to clear the fault code in accordance with the corresponding model specified in the fault code, and must not be used to remove the negative pole of the battery to clear the fault code.

Cause some models of the control center computer to lose normal records, many car owners know, most of the models of the computer is with memory function, if you remove the battery negative connection line, will lose the random access to the engine operation experience data, this is why some people find that after the maintenance is cleared, found that the performance for a long time is not good or driving soon.

The use of Citroen P1621I checked the circuit diagram of the two-stage fan of the Surui TID, the main driver's is the cooling fan, and the co-pilot's is the condensing fan. At the same time, it is controlled by speed and high speed, but it is controlled by different safety relays, and the relay position is late in the outer hidden silver hanging relay box on the side of the distribution box in the front warehouse, and the voltage of the 1 pin of the No. 1 relay is only 11V, and the voltage is 0 after being directly connected to the 2 pins.

Meaning and reasons for P0117 and P0118.

P0018: The signal voltage of the coolant temperature sensor is too high. The reasons could be:

The sensor line is short-circuited to ground.

The resistance is too low. Damaged sensor P0017: The signal voltage of the coolant temperature sensor is too low. The reasons could be:

The sensor line is open to ground.

The resistance is too great. Short circuit to the 5V power supply.

The sensor is damaged.

Water temperature sensor signal voltage detection mechanism.

Both P0117 and P0118 are Class A failures**. Under what circumstances will these two errors be determined?

Fault ** means judgment condition.

The P0117 coolant temperature sensor signal voltage is too low, the engine running time is 60 seconds, the coolant temperature is higher than 145, and the fault duration is more than 2 seconds.

The coolant temperature sensor P0118 signal voltage is too high, the engine running time is 60 seconds, the coolant temperature is lower, and the fault duration is more than 2 seconds.

Thoughts on the Fault Handling of Signal Voltage of Water Temperature Sensor.

1 water temperature sensor.

If the engine is left on hold overnight, the numerical error of water temperature and intake air temperature should be within 3.

After the failure, according to the downtime select:

When the downtime is greater than a certain threshold, the simulated water temperature is obtained by accumulating the rotational speed with the inlet air temperature as the initial value.

When the downtime is short, the water temperature of the previous shutdown is the initial value, and the simulated water temperature is obtained by accumulating the rotational speed.

2. Troubleshooting ideas for water temperature sensors.

For example, the data stream shows -11 in the case of a cold car failure and 47 in the case of a hot car failure.

Analysis: Intermittent failures can be caused by poor line contact, worn wire insulation, short circuits, or broken insulation.

In the event of a failure, the diagnostic equipment will change accordingly, which can determine the location of the intermittent failure.

If the sensor circuit short-circuits the positive voltage of the battery, the engine control module and sensors may be damaged.

Each 5V reference voltage is connected to the ECM both internally and externally, and the failure of other sensors or circuits that share the 5V reference voltage can also cause a fault**.

During the diagnostic process, you can disconnect sensor plug-ins or circuit plug-ins that share 5V voltage. @2019

Summary. The solution to the P0118 fault is as follows:1

Check that the coolant is sufficient, and if it is not enough, replenish the coolant. In addition, the engine coolant should be replaced on schedule, and the general cycle is 2 years or 40,000 kilometers; 2.Check whether the thermostat, water pump and cooling fan in the cooling system are working well, and whether the coolant is circulating and flowing.

The solution to the P0118 fault is as follows:1Check whether the coolant is sufficient, if not, replenish the pure Xiangchong coolant.

In addition, the engine coolant should be replaced on schedule, and the general cycle is 2 years or 40,000 kilometers; 2.Check whether the thermostat, water pump, and cooling fan in the cooling system are working well, and whether the coolant has a poor circulating flow wheels.

3. If the sensor circuit short-circuits the positive voltage of the battery, the ECM and the sensor may be damaged. 4. This width needs to be cleared after the car is troubleshooting**. 5. When clearing the fault code, it must be carried out in strict accordance with the way of clearing the fault code specified by the specific model, and the car fault code must not be cleared by dismantling the negative pole of the battery.

Check if the thermostat is normal, check if there is any problem with the sensor wiring and connection, P0128 fault code, applicable to all car manufacturers, which means coolant thermostat.

The function of the thermostat is to shut down when the coolant temperature is low, only allowing the coolant to circulate in the engine and increase the speed of the hot car; When the water temperature exceeds the set temperature, the thermostat is turned on, allowing the coolant to circulate to the tank radiator, effectively improving the cooling efficiency. This fault code indicates that the thermostat has not reached the required engine operating temperature within the set time after the engine is started. Causes of failure include the thermostat stuck in the open position, engine coolant temperature (ECT) sensor failure, etc.

After car troubleshooting, it is generally necessary to clear the fault**. When clearing the fault code, it should be carried out in strict accordance with the fault removal scheme specified by the specific vehicle model, and the fault should not be removed simply and arbitrarily by removing the negative pole of the battery and the iron wire. Otherwise, there is a chance that there will be two anomalies mentioned below:

1. Cause the control computer of some models to lose the "historical record", we know that the control computer of some models has an automatic memory function, after removing the negative pole of the battery, it will automatically clear the engine operation data stored in RAM (with no inorganic memory), so as to cause the performance of the car to be average for a long time after maintenance, or after driving for a period of time, there is a fault code that has been cleared.

2. It will also cause the loss of some functions, such as the audio locking function is one of the very common cases, in this case, to work normally of the audio system, it is necessary to repair the audio again, and this situation is very troublesome.

Photo by Tang Yanyan) Model Y Model 3 Model X AION V Ideal One Xpeng P7 @2019