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MAN Truck Fault Codes Conditioner with Electronic control


Code

Description

 

3000

 

Outside temperature sensor

 

The fault state:

 

FMI 5, a short to ground

 

FMI 12, a break or short circuit to + UBat

 

Cause: faulty external temperature sensor, wiring harness malfunction.

 

Remedy: Use a PC, check the accuracy of the signal, check external temperature sensor, check the wiring, check the connectors.

 

Control Steps:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the "Outside temperature sensor" signal.

 

Resistance Measurements:

 

Outside temperature sensor; control unit heater / air conditioner (A250) - between Pin A4 (+) and Pin A9 (-): ~ 10 ohms at 25 ° C

 

3001

 

Evaporator temperature sensor

 

The fault state:

 

FMI 5, a short to ground

 

FMI 12, a break or short circuit to + UBat

 

Cause: faulty evaporator temperature sensor fault harness.

 

Remedy: Use a PC, check the signal accuracy of the check of the evaporator temperature sensor, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "sensor of the evaporator temperature".

 

Resistance measurement:

 

evaporator temperature sensor; control unit heater / air conditioner (A250) - between Pin A8 (+) and Pin A9 (-): ~ 10 ohms at 25 ° C

 

3002

 

Heat exchanger temperature sensor

 

The fault state:

 

FMI 5, a short to ground

 

FMI 12, a break or short circuit to + UBat

 

Cause: faulty heat exchanger temperature sensor fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, check the heat exchanger temperature sensor, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the signal accuracy of the "heat exchanger temperature sensor."

 

Resistance measurement:

 

the heat exchanger temperature sensor; control unit heater / air conditioner (A250) - between Pin A5 (+) and Pin A9 (-): ~ 10 ohms at 25 ° C

 

3003

 

An internal temperature sensor

 

The fault state:

 

FMI 9, device malfunction

 

Cause: faulty sensor internal temperature, heated driver's cab control unit (A474) is faulty.

 

Remedy: Use a PC, check the signal integrity.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the "sensor internal temperature" signal.

 

3011

 

Stepper motor side jets

 

The fault state:

 

FMI 6, short circuit to + UBat

 

FMI 13, a break or a short to ground

 

Cause: faulty stepper motor side nozzles, fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, perform testing actuators, check the stepper motor side of the nozzle, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "Stepper motor side of the nozzle."

 

Testing of actuators:

 

With PC perform testing actuators "Stepper motor side of the nozzle."

 

3012

 

Stepper motor recirculation air

 

The fault state:

 

FMI 5, a short to ground

 

FMI 12, a break or short circuit to + UBat

 

Cause: faulty stepper motor recirculation air, the fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, perform testing actuators, check the stepper motor air recirculation, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "Stepper motor recirculated air."

 

Testing of actuators:

 

With PC perform testing actuators "Stepper motor recirculated air."


Stepper motor air distribution

 

The fault state:

 

FMI 6, short circuit to + UBat

 

FMI 13, a break or a short to ground

 

Cause: faulty air distribution stepper motor fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, perform testing actuators, check the stepper motor air distribution, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "Stepper motor air distribution."

 

Testing of actuators:

 

With PC perform testing actuators "Stepper motor air distribution."

 

3014

 

Stepper motor bypass

 

The fault state:

 

FMI 6, short circuit to + UBat

 

FMI 13, a break or a short to ground

 

Cause: faulty stepper motor bypass, fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, perform testing actuators, check the stepper motor bypass, check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the "stepper motor bypass' signal.

 

Testing of actuators:

 

With PC perform testing actuators "Stepper motor bypass."

 

3040

 

Fan

 

The fault state:

 

FMI 5, a short to ground

 

FMI 6, short circuit to + UBat

 

Cause: faulty fan controller, wiring harness malfunction, faulty blower motor.

 

Remedy: Use a PC, check the accuracy of the signal, perform testing actuators, check the wiring, check the plug-in connections, check fan controller, check the fan motor, check fuses F131.

 

testing stages:

 

Implementation of monitoring:

 

check the accuracy of the "Fan" signal using a PC.

 

Testing of actuators:

 

With PC perform testing actuators "Fan".

 

3041

 

Compressor

 

The fault state:

 

FMI 5, a short to ground

 

FMI 10, the gap

 

Cause: high or low pressure in the cooling circuit, the faulty high / low pressure switch (B203), a faulty compressor clutch (Y114), the fault harness.

 

Remedy: Test the actuator, check the wiring, check the connectors, check the compressor clutch (Y114), measure the voltage.

 

testing stages:

 

Testing of actuators:

 

With PC perform testing actuators "Compressor".

 

Voltage measurement:

 

compressor clutch; control unit heater / air conditioner (A250) - between Pin A24 (+) and Pin A25 (-): 16-32 V (Ubat)

 

3050

 

Solenoid valve

 

The fault state:

 

FMI 5, a short to ground

 

FMI 10, the gap

 

Cause: faulty solenoid valve of the front air conditioner (Y117), fault (fail) harness.

 

Remedy: Test the actuator, check the wiring, check the connectors, check the solenoid valve of the front air conditioner (Y117), measure the voltage.

 

testing stages:

 

Testing of actuators:

 

With PC perform testing actuators "solenoid valve".

 

Voltage measurement:

 

The solenoid valve of the front air conditioning; control unit heater / air conditioner (A250) - between Pin A23 (+) and Pin A25 (-): 0 V - the solenoid valve is closed; 16-32 (UBat) - solenoid valve is opened.


Cl. 30, the voltage

 

The fault state:

 

FMI 1 is too high

 

FMI 2, too low

 

Cause: power supply terminals 30 heater / air conditioner control unit (A250) is too high or too low, fuse F397, the fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, check the wiring, check the connectors, check the fuse F397, measure the voltage.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "Kl. 30, the tension. "

 

Voltage measurement:

 

Terminal 30; control unit heater / air conditioner (A250) - between Pin A19 (+) and Pin A25 (-): 16-32 In (UBat)

 

3120

 

LIN bus

 

LIN - Local Interconnect Network

 

The fault state:

 

FMI 5, a short to ground

 

FMI 6, short circuit to + UBat

 

FMI 10, the gap

 

Cause: Fault Harness

 

Remedy: check wiring, check the connectors.

 

3130

 

Coolant Pressure

 

The fault state:

 

FMI 1 is too high

 

FMI 2, too low

 

Cause: high or low pressure in the cooling circuit, the faulty high / low pressure switch (B203), the fault harness.

 

Remedy: Use a PC, check the accuracy of the signal, check the high / low pressure switch (B203), check the wiring, check the connectors.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "coolant pressure sensor".

 

3150

 

Another option is the body control unit

 

The fault state:

 

FMI 9, device malfunction

 

Cause: Options for heating cab control unit (A474) and the heater / air conditioner control unit (A250) are incompatible.

 

Remedy: Check whether the installed heating cab control unit (A474) or the heater / air conditioner control unit (A250).

 

3160

 

Management body cells. 30, the voltage

 

The fault state:

 

FMI 1 is too high

 

FMI 2, too low

 

Cause: power supply terminals 30 cab heating control unit (A474) is too high or too low, the fault F128 fuse fault harness.

 

Remedy: check wiring, check the connectors, check the fuse F128, measure the voltage.

 

testing stages:

 

Implementation of monitoring:

 

With the help of a PC, check the accuracy of the signal "Kl. 30, the tension. "

 

Voltage measurement:

 

Terminal 30; Heated driver's cab control unit (A474) - between Pin 3 (+) and Pin 6 (-): 16-32 (UBAT)