MID146 Volvo climate control unit fault codes

Deciphering of MID146 diagnostic trouble codes for Volvo air conditioners/heater/climate control

See also:

• MID144 Volvo VECU Control Unit Fault Codes
• MID141 Volvo Dynafleet control unit fault codes

 

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.