Deciphering of MID146 diagnostic trouble codes for Volvo air conditioners/heater/climate control
See also:
MID 146 PID 170
Parameter:
Cab temperature sensor
Fault:
FMI 3 The climate control unit registers the voltage in the temperature sensor circuit above 4.86 V. The sensor is not connected to the control unit. It is possible to short the signal or ground wire to a higher voltage.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.7 V. The signal wire is shorted to ground or the sensor is faulty.
MID 146 PID 171
Parameter:
Outdoor temperature sensor
Fault:
FMI 3 The microclimate control unit registers the voltage in the temperature sensor circuit above 4.9 V. Closing the signal or ground wire to a higher voltage. The sensor may be faulty.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.55 V. The signal wire is shorted to ground or the sensor is faulty.
MID 146 SID 2
Parameter:
Air temperature sensor (located between the evaporator and the fan)
Fault:
FMI 3 The climate control unit registers the voltage in the temperature sensor circuit above 4.86 V. The sensor is not connected to the control unit. It is possible to short the signal or ground wire to a higher voltage.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.24 V. The signal wire is shorted to ground or the sensor is faulty.
MID 146 SID 5
Parameter:
Stepper motor control flap external air flow and recirculation
Fault:
FMI 4 The climate control unit registers a short to ground. Shorting the signal wire of an electric motor to a lower voltage or ground.
MID 146 SID 6
Parameter:
Stepper motor for controlling air distribution flaps
Fault:
FMI 4 The climate control unit registers a short to ground. Shorting the signal wire of an electric motor to a lower voltage or ground.
MID 146 SID 9
Parameter:
Stepper motor to control the air supply to bypass the heat exchanger
Fault:
FMI 4 The climate control unit registers a short to ground. Shorting the signal wire of an electric motor to a lower voltage or ground.
MID 146 SID 11
Parameter:
A / C Compressor Clutch
Fault:
FMI 4 Shorting the signal wire to a lower voltage or ground circuit.
FMI 5 Broken wire mass of the compressor clutch or defective clutch.
MID 146 SID 12
Parameter:
Coolant flow control valve through heat exchanger
Fault:
FMI 3 Shorting the signal or ground wire to a higher voltage.
FMI 4 Shorting the signal wire to ground.
FMI 5 Broken power wire, ground, fuse F32 defective or valve defective.
MID 146 SID 13
Parameter:
Air temperature sensor after heat exchanger
Fault:
FMI 3 The climate control unit registers the voltage in the temperature sensor circuit above 4.9 V. The sensor is not connected to the control unit. It is possible to short the signal or ground wire to a higher voltage.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.24 V. The signal wire is shorted to ground or the sensor is faulty.
MID 146 SID 14
Parameter:
Micro-fan of the air temperature sensor in the cabin (combined with the temperature sensor)
Fault:
FMI 4 Shorting the signal wire to a lower voltage or ground.
MID 146 SID 16
Parameter:
Step motors, first phase
Fault:
FMI 3 Shorting the signal wire of the corresponding phase of an electric motor to a higher voltage.
MID 146 SID 17
Parameter:
Stepper motors, second phase
Fault:
FMI 3 Shorting the signal wire of the corresponding phase of an electric motor to a higher voltage.
MID 146 SID 18
Parameter:
Stepper motors, third phase
Fault:
FMI 3 Shorting the signal wire of the corresponding phase of an electric motor to a higher voltage.
MID 146 SID 19
Parameter:
Stepper motors, fourth phase
Fault:
FMI 3 Shorting the signal wire of the corresponding phase of an electric motor to a higher voltage.
MID 146 SID 22
Parameter:
Refrigerant pressure sensor in the system
Fault:
FMI 3 The microclimate control unit registers a signal with a voltage higher than 4.5 V from the pressure sensor. The signal or ground wire is closed at a higher voltage.
FMI 4 The climate control unit registers a signal with a voltage below 0.3 V from a pressure sensor. The signal wire is shorted to ground, there is a wire break between the unit and the sensor, or the sensor is not connected to the connector.
MID 146 SID 232
Parameter:
Power supply 5 V. Refrigerant pressure sensor in the system
Fault:
FMI 3 The climate control unit registers the sensor supply voltage above 5.5 V. Shorting the signal or ground wire to a higher voltage.
FMI 4 The climate control unit registers a short to ground. Shorting the signal wire to a lower voltage or ground.
MID 146 SID 240
Parameter:
Program memory
Fault:
FMI 2 Incorrect software, emergency interruption of the programming process, or the climate control unit is faulty.
MID 146 SID 250
Parameter:
SAE J1708 data feed
Fault:
FMI 2 Invalid information from other blocks. check fault codes in other control units.
FMI 3 The climate control unit registers the voltage above 4.86 V. The closure of the wires of the data channel to a higher voltage.
FMI 4 The climate control unit registers the voltage below 0.24 V. The closure of the wires of the data channel to ground.
FMI 12 Faulty data channel wires or faulty control unit.
MID 146 SID 253
Parameter:
Gauge EEPROM Memory
Fault:
FMI 2 The programming of the block is incorrect or the memory chip is faulty in the control unit. Reprogram the cabin climate control unit. In extreme cases, replace the control unit.
MID 146 PSID 6
Parameter:
The main temperature sensor (located in the control unit and microclimate switches)
Fault:
FMI 3 The climate control unit registers the voltage in the temperature sensor circuit above 4.95 V. Closing the signal or ground wire to a higher voltage. Replace climate control unit.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.05 V. Closing the signal wire to ground. Replace climate control unit.
MID 146 PSID 7
Parameter:
Compensation temperature sensor (located in the control unit and microclimate switches)
Fault:
FMI 3 The climate control unit registers the voltage in the temperature sensor circuit above 4.95 V. Closing the signal or ground wire to a higher voltage. Replace climate control unit.
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.05 V. Closing the signal wire to ground. Replace climate control unit.
MID 146 PSID 8
Parameter:
Solar sensor (located in the control unit and microclimate switches)
Fault:
FMI 4 The climate control unit registers the voltage in the temperature sensor circuit below 0.05 V. Closing the signal wire to ground. Replace climate control unit.
MID 146 PSID 200
Parameter:
Data Link Disruption SAE J1587 with engine control unit MID128
Fault:
FMI 12 Communication with the engine control unit MID128 has been interrupted for more than 60 seconds. There is no information about the temperature of the coolant and engine speed. The closure or breakage of the data channel SAE J1587. Check the integrity of the data channel, check the trouble codes in the engine control unit.
MID 146 PSID 201
Parameter:
Data Link Disruption SAE J1587 with car control unit MID144
Fault:
FMI 12 Communication with the vehicle control unit MID144 was interrupted for more than 60 seconds. No information about the speed of the car. The closure or breakage of the data channel SAE J1587.Check the integrity of the data channel, check the trouble codes in the vehicle control unit.
MID 146 PSID 202
Parameter:
Data Link Disruption SAE J1587 with dashboard control unit MID140
Fault:
FMI 12 Communication with the dashboard control unit MID140 was interrupted for more than 60 seconds. No information about outdoor temperature. The closure or breakage of the data channel SAE J1587. Check the integrity of the data channel, check the trouble codes in the dashboard control unit.
