SCANIA Truck EMS Fault Codes List DTC

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SCANIA FAULT CODES
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Code Title Fault Causes Notes Remedy

 

51

Turbocharger, bypass valve

 

Incorrect voltage in the solenoid valve circuit controlling the bypass valve.

 

The bypass valve of the turbocharger is controlled by a solenoid valve (V109), which receives signals from the engine management system. An open or short in the electrical circuit of the solenoid valve.

 

The charge pressure is not adjusted properly, danger of overload.

 

Check the solenoid valve, wiring and electrical connectors.

 

52

Turbocharger, bypass valve

 

Incorrect voltage in the solenoid valve circuit controlling the bypass valve.

 

The bypass valve of the turbocharger is controlled by a solenoid valve (V109), which receives signals from the engine management system. A short to ground in the electrical circuit of the solenoid valve.

 

Boost pressure is not properly adjusted, this can lead to poor handling.

 

Check the solenoid valve, wiring and electrical connectors.

 

53

Turbocharger, bypass valve

 

Incorrect voltage in the solenoid valve circuit controlling the bypass valve.

 

The bypass valve of the turbocharger is controlled by a solenoid valve (V109), which receives signals from the engine management system. A short to power in the electrical circuit of the solenoid valve.

 

The charge pressure is not adjusted properly, danger of overload.

 

Check the solenoid valve, wiring and electrical connectors.

 

55

Lambda sensor

 

Lambda sensor heating system voltage too low.

 

Short circuit to ground

 

Torque is reduced to protect the engine.

 

Check the element, connectors and wiring. Replace lambda sensor.

 

56

Lambda sensor

 

Lambda sensor heating system voltage too high.

 

Short to battery +.

 

Torque is reduced to protect the engine.

 

Check the element, connectors and wiring. Replace lambda sensor.

 

57

Turbocharger, bypass valve

 

Incorrect voltage in the solenoid valve circuit controlling the bypass valve.

 

The bypass valve of the turbocharger is controlled by a solenoid valve (V109), which receives signals from the engine management system. An open or short in the electrical circuit of the solenoid valve.

 

The charge pressure is not adjusted properly, danger of overload.

 

Check the solenoid valve, wiring and electrical connectors.

 

112

Outside temperature sensor or temperature sensor before air intake to the impeller of the turbocharger

 

The outside temperature sensor indicates a too high value or the temperature sensor before intake of air to the impeller of the turbocharger shows a too low value.

 

outside temperature sensor or temperature sensor before air intake to the impeller of the turbocharger is faulty

 

cracks in the intake manifold

 

The test compares the temperature values from the outside temperature sensor and the temperature sensor in front of the inlet of the impeller of the turbocharger when the vehicle is moving. Verification can be performed faster if the car is moving at high speed.

 

The EGR system is turned off if the measured outside temperature is too low. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The fault code cannot be cleared while the fault is present.

 

Check the outside temperature sensor and the temperature sensor before air intake to the impeller of the turbocharger.

 

Ensure that the pipeline between the turbocharger and the air filter is in good condition and not leaking.

 

Clear the DTC by turning off the key with the key and wait 15 seconds. Start the engine and allow the car to move for more than 10 minutes at a speed above 40 km / h.

 

113

Outside temperature sensor

 

The outside temperature sensor indicates a too high value or the temperature sensor before intake of air to the impeller of the turbocharger shows a too low value.

 

outside temperature sensor or temperature sensor before air intake to the impeller of the turbocharger is faulty

 

cracks in the intake manifold

 

During this test, when the vehicle is moving, a comparison is made between the temperature readings from the outside temperature sensor and the temperature sensor before the air inlet to the impeller of the turbocharger. The check can be performed faster if the car is moving at a higher speed.

 

The EGR system turns off when the measured outside temperature is too low. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The fault code cannot be cleared while the fault is present.

 

Check outdoor sensor


 

151

Charge air temperature sensor T121

 

Faulty charge air temperature sensor.

 

Short circuit to ground

 

This can affect engine power. There is the danger of black smoke.

 

Check the connectors and wiring of the charge air temperature sensor.

 

Measure the resistance of the intake air temperature sensor. The electrical resistance should be approximately 2.5 kΩ at 20 ° C.

 

Measure the sensor supply voltage. With the sensor disconnected, the voltage should be approximately 5 V.

 

152

Charge air temperature sensor T121

 

Faulty charge air temperature sensor.

 

Short to battery + (U30) or open circuit.

 

This can affect engine power. There is the danger of black smoke.

 

Check the connectors and wiring of the charge air temperature sensor.

 

Measure the sensor resistance. The electrical resistance should be approximately 2.5 kΩ at 20 ° C.

 

256

Mass sensor air inlet T126

 

The readings of the mass flow sensor remain unchanged, although the operating conditions indicate the opposite.

 

The air flow sensor may be faulty.

 

The engine control unit switches off the exhaust gas recirculation system. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The fault code cannot be cleared while the fault is present.

 

Check the electrical components, electrical connectors and wiring.

 

Replace the air flow sensor.

 

257

Mass sensor air inlet T126

 

Malfunctioning air flow sensor.

 

The mass flow sensor is unsatisfactory.

 

The engine control unit switches off the exhaust gas recirculation system. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The fault code cannot be cleared while the fault is present.

 

If there are additional DTCs for the mass flow sensor T126, first run these DTCs.

 

Troubleshoot electrical problems with the mass flow sensor and connectors.

 

Check for leaks in the EGR system or in the charge-air system.

 

Check backpressure sensor in exhaust system T125, charge air pressure sensor T122 and charge air temperature sensor T121.

 

258

Mass sensor air inlet T126

 

The voltage in the circuit was below acceptable levels.

 

Short to ground or open circuit.

 

The engine control unit switches off the exhaust gas recirculation system. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The engine control unit uses the calculated value for the mass air flow sensor, and the engine power is reduced.

 

The fault code cannot be cleared while the fault is present.

 

Check the electrical components, electrical connectors and wiring.

 

If the operating time since the generation of the fault code exceeds 10 hours, empty the EGR cooler, as there is a danger of condensation in the air-cooled EGR cooler after the EGR system is turned off. Empty the EGR cooler following the instructions given in the manual for service stations, subgroup 01-65.

 

Be sure to perform a basic adaptation of the mass flow sensor adaptation after replacing the mass flow sensor or after repairing a leak in the engine intake system.

 

259

Mass sensor air inlet T126

 

The voltage in the circuit exceeded the permissible level.

 

Short to battery +.

 

The engine control unit switches off the exhaust gas recirculation system. In accordance with current legal requirements, engine power is reduced on vehicles that are equipped with NOx exhaust control.

 

The engine control unit uses the calculated value for the mass air flow sensor, and the engine power is reduced.

 

The fault code cannot be cleared while the fault is present.

 

Check the electrical components, electrical connectors and wiring.

 

If the operating time since the generation of the fault code exceeds 10 hours, empty the EGR cooler, as there is a danger of condensation in the air-cooled EGR cooler after the EGR system is turned off.


261

Charge air pressure sensor

 

The charge air pressure sensor generates a value outside the acceptable range.

 

The charge air pressure sensor produces a too high or too low reading compared to the readings from other pressure sensors, as there is a fault in the sensor or defects in the electrical connectors or wiring.

 

A malfunction may result in an incorrect amount of fuel being applied and a decrease in engine power.

 

The fault code cannot be cleared while the fault is present.

 

When the engine is off and the ignition key is in position U15:

 

Compare the value of the charge air pressure sensor with the values of the atmospheric pressure sensor and the exhaust backpressure sensor. All sensors must give the same readings.

 

First erase the DTC by allowing the engine to run until it reaches operating temperature. Switch off the ignition. The DTC will clear within 30 seconds.

 

262

Charge air pressure sensor

 

In idle mode, the value of the charge air pressure sensor is not equal to the atmospheric pressure and / or exhaust back pressure.

 

The charge air pressure sensor generates an incorrect value.

 

Faulty electrical connector or wiring in the circuit.

 

The engine does not receive the correct amount of fuel. Power is reduced to protect the engine.

 

Troubleshoot by comparing the charge air sensor reading with the atmospheric pressure sensor and the backpressure sensor in the exhaust system. All sensors must give the same readings.

 

When the engine is off and the ignition key is in position U15:

 

Troubleshoot.

 

First erase the DTC by allowing the engine to run until it reaches operating temperature. Switch off the ignition. The DTC clears within 30 seconds.

 

If the operating time since the generation of the fault code exceeds 10 hours, empty the EGR cooler, as there is a danger of condensation in the air-cooled EGR cooler after the EGR system is turned off. Empty the EGR cooler following the instructions given in the manual for service stations, subgroup 01-65.

 

263

Charge air pressure sensor

 

The voltage in the electrical circuit was too low.

 

Short to ground or open circuit.

 

The engine control unit shuts off the EGR system and reduces engine power.

 

The fault code cannot be cleared while the fault is present.

 

Check the charge air pressure sensor as well as the electrical connectors and wiring.

 

If the operating time since the generation of the fault code exceeds 10 hours, empty the EGR cooler, as there is a danger of condensation in the air-cooled EGR cooler after the EGR system is turned off. Empty the EGR cooler following the instructions given in the manual for service stations, subgroup 01-65.

 

264

Charge air pressure sensor

 

The voltage in the circuit exceeded the permissible level.

 

Short to battery or ground contact lost.

 

The engine control unit shuts off the EGR system and reduces engine power.

 

The fault code cannot be cleared while the fault is present.

 

Check the electrical components, electrical connectors and wiring.

 

If the operating time since the generation of the fault code exceeds 10 hours, empty the EGR cooler, as there is a danger of condensation in the air-cooled EGR cooler after the EGR system is turned off. Empty the EGR cooler following the instructions given in the manual for service stations, subgroup 01-65.

 

273

Charge air temperature sensor T121 or air intake temperature sensor T126

 

For engine control units manufactured before February 2009:

 

Malfunction of the temperature sensor charge air T121.

 

For engine control units manufactured after February 2009:

 

Malfunction of the air intake temperature sensor T126. The sensor consists of the same elements as the intake air flow sensor. The voltage in the electrical circuit was above normal.

 

For engine control units manufactured before February 2009:

 

There may be a malfunction in the charge air temperature sensor or its wiring.

 

For engine control units manufactured after February 2009:

 

Short to battery + or an open circuit in the air intake temperature sensor circuit.

 

For engine control units manufactured before February 2009:

 

This can affect engine power. There is the danger of black smoke.

 

For engine control units manufactured after February 2009:

 

This can affect engine power.

 

For engine control units manufactured before February