The control unit operates according to a special algorithm. If the control unit detects a failure or any other violation, which is interpreted by it as a deviation from the norm, the control unit responds and sets the appropriate fault codes. Not only real failures can cause the installation of fault codes. To do this, it is enough to disconnect the electrical plug. wires with electr. nutrition. Breach of electr. the circuit in the connector will be perceived by the control unit as a malfunction, and it will set the appropriate code.
Scania Abs Fault Codes Rar
In cases of violation of electr. contact malfunction can be eliminated, but the set fault code will be stored in the memory of the control unit until it is erased forcibly. This allows you to find out in what electr. the circuit has malfunctioned and also searched for the cause of the malfunction, even if it is no longer present. The control unit also stores information on the number of reported cases of each fault. However, to obtain such information, it is necessary to use the EE diagnostic program installed on a personal computer. Most often failures occur not in the control unit, but in electr. system wiring and peripherals. Fault codes that are misleading and difficult to diagnose, rarely occur and usually do not belong to the control unit itself. In a good control unit, protected from external interference, such fault codes should not occur. One would assume that, for example, an inductive sensor would react to external interference in the form of radio signals or strong magnetic fields. However, tests and measurements performed have shown that external interference cannot have such a strong effect on control units. However, there can always be malfunctions associated with contact disturbances with the mass, with corrosion or weakening of the contacts in the connectors - regardless of the quality of work performed and the manufacture of add. body equipment.
Lamp fault codes must be read on a stationary vehicle. It does not matter if the engine is running or not. Perform the following steps. Turn the starter key to the on / off position and wait a few seconds. Press and hold
diagnostic switch 1 for at least one second, then release it. In this case, the di-agnostic lamp goes out for 2 seconds and then starts issuing fault codes. The sequences of flashes of the lamp are separated from each other by easily visible pauses.
First, the configuration code of the control unit is displayed, see above the section "Configuration codes". Then follow the trouble codes. If there is no fault code in the memory of the control unit,
The first issued 3 or 4-bit configuration code. For more information, see the Configuration Codes section. After issuing the configuration code, there is a pause of 4.5 seconds. Then, two-digit trouble codes are issued. First, a digit is given in the tens digit, then a digit in the digit unit. The example on the right shows a black representation of DTC 32 (preceded by a 4-digit configuration code). Codes are not
Validations are issued as follows: the first digit of the code - 1, 5 s pause - the second digit of the code - 4.5 s pause - the next fault code - the next fault code, etc. Fault codes are issued in order of occurrence of faults.
The diagnostic lamp allows you to issue fault codes again an unlimited number of times. To do this, simply press the diagnostic switch again. Fault codes remain in the memory of the control unit until forced erasing and clearing the memory.
After you have identified and eliminated the cause of the fault, you must clear the memory of the control unit. For the appearance of some trouble codes, it may be necessary to have a sufficiently long vehicle movement (up to half an hour). Turn the starter key and turn off the power
If the alarms did not go out or the "RET" alarms turned on again, despite the erasing of the fault codes. This means that the fault has remained. A trouble code helps to locate the cause of the failure.
The fault codes listed below relate primarily to the 4-series vehicles, which are equipped with a Scania Retarder. The texts of messages on the fault codes are taken from the diag. SD program designed for a personal computer. Therefore, sometimes reference is made to a diagnostic computer program and the options offered there, which allow speeding up and facilitating fault diagnosis.
The codes with the designations 01-10,20,30,40,50 and 60 do not exist (the number 0 cannot be output with the help of the flashing diag. Of the lamp). Currently, fault codes 2 3, 24, 3 8 and 45 are not used.
driving on a / m, check that the signal of the frequency of rotation of the propeller shaft was different from zero. If the signal is zero and the car is equipped with an Orysgshee system, the following recommendation may be useful: if the Opticruise system is functioning, then the cause of the fault is between
Max. the power of the water retarder will be limited as long as this fault remains. In this case, if the engine runs at low speeds, then there is also a danger of boiling of the coolant, since the cooling system pump does not provide a sufficiently intense coolant circulation. If the signal appears, confirming the operation of the engine, then the hydrate retarder will start working at full power again. However, the DTC will be stored in the memory of the control unit. DTC 12 can be set only if the control unit has information that the car is moving. Otherwise, a malfunction code would be set each time the driver turns on the onboard power supply. The visual alarm goes out as soon as a signal appears on a moving vehicle. Conversely, when the engine is not running, the warning lamp will remain on until the fault code is cleared. The signal W received from the generator is also used for the functioning of the tachograph of the a / m.
The signal is used to continuously evaluate the heat output that the cooling system is able to dissipate. For this reason, the corresponding generator and pulleys should be installed on the car. Otherwise, brake. the power of the water retarder can be limited and no fault codes are set. will not be. In any case, it is impossible to mislead the control unit (so that it increases the permissible braking power of the hydraulic retarder) by installing an unsuitable generator or inappropriate pulleys. Installing a generator of another model or other pulleys, which is associated with a change in the gear ratio of the drive, makes it necessary to specify in the control unit a different signal frequency W, which corresponds to a crankshaft rotation speed of 500 rpm. This can only be done with a diagnostic scanner. The hydrathread slowdown malfunction indicator goes out if the fault has been eliminated.
The control unit ignores the signal from the temperature sensor 1 as long as the fault is present. In this case, the control unit uses the signal from the temperature sensor 2. The visual malfunction indicator turns off if the malfunction is eliminated. However, the DTC will be stored in the memory of the control unit. The visual alarm of failure of the moderator is extinguished if the malfunction disappears.
The control unit ignores the signal from the temperature sensor 2 as long as the fault is present. In this case, the control unit uses the signal from the temperature sensor 1. The visual malfunction indicator turns off if the malfunction is eliminated. However, the DTC will be stored in the memory of the control unit. The visual alarm of failure of the moderator is extinguished if the malfunction disappears.
This is provided in order to increase the circulation rate of the coolant and to ensure the possibility of implementing the maximum brake. power. If wiring is not connected to pin 54, it is possible that the control unit itself is faulty. This fault is not
does not affect the hydrate retarder per se. However power is limited too often, because the coolant consumption is insufficient. Automatic switching KP to the lowest level is missing. The visual fault indicator remains on (even if the fault is no longer present) until the fault code is cleared using the diagnostic switch. The fault limiter fault indicator is turned off only after erasing the fault code.
The visual fault indicator remains on (even if the fault is no longer present) until the fault code is cleared using the diagnostic switch. Some drivers require the installation of a standard floor switch designed to control the motor. retarder. Incorrect connection of such a switch may cause fault code 17, since the control unit will then receive an input signal on the output plug. The fault delay indicator is turned off only after erasing the fault code.
The fault malfunction indicator remains on (even if the fault is no longer present) until then; until the DTC is cleared using the diagnostic switch. The output 55 of the control unit for braking signals is used to test the braking signal relay. The output signal is connected to ground. It is forbidden to connect braking signals directly to the ground via the output plug. To do this, you need to use the brake signal relay. The indicator of activation of the water retarder or the engine, retarder is installed as standard only on vehicles that are not equipped
ABS. Some drivers require the installation of such an indicator also on the car, equipped with ABS. If such an indicator is installed on the vehicle at the operation stage, then it is necessary to connect it to the +24 V power supply and to the control unit 55 plug. The indicator turns on when the circuit is shorted to ground through the plug 55. Use a conventional 1.2W lamp. In order to prevent the indicator from turning on when the brake signals are turned on when the brake is pressed. pedal, can in some cases be included in the electr. circuit diode. The fault delay indicator is turned off only after erasing the fault code.
In the presence of this fault, the deceleration agent enters into work with a delay compared to the good condition. The fault malfunction indicator remains on (even if the fault is no longer present) until the fault code is cleared using the diagnostic switch. The warning device for malfunction of the water retarder turns off only after 2ff7e9595c
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