MAN Truck AC Fault Codes DTC
MAN AC Fault Codes DTC
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)