Group 87 Climate Control, Fault Codes
Troubleshooting
MID 146 SID 2 Temperature Sensor, Evaporator
T8008634
T8008560
Component:A34 Climate Control Unit, E32 Climate
Unit
General information
The sensor measures the air temperature after the
evaporator and before the blower fan. The temperature
signal is used to protect the evaporator against icing
by engaging and disengaging the compressor. The
compressor is disengaged at approximately 3 C (37 F)
and engages at approximately 8 C (46 F).
Fault code
FMI 3
Abnormally high voltage or short-circuit to higher voltage.
Conditions for fault code:
•
If the control unit detects a voltage higher than
4.86 volts the control unit interprets this as an error
and a fault code is stored.
Possible cause:
•
Connector to sensor disconnected
•
Signal cable short-circuited to higher voltage
•
Ground lead short-circuited to higher voltage
Reaction from the control unit:
•
Fault code is stored
•
Yellow lamp requested
Noticeable external symptoms:
•
Yellow lamp lights up
•
The compressor "cycles" 20 s active, 60 s inactive
Appropriate check:
•
See “MID 146 SID 2 Temperature Sensor Evaporator,
Check” page 12
FMI 4
Abnormally low voltage or short-circuit to lower voltage
Conditions for fault code:
•
If the control unit detects a voltage lower than 0.24 volts
the control unit interprets this as an error and a fault
code is stored.
Possible cause:
•
Signal cable short-circuited to ground
Reaction from the control unit:
•
Fault code is stored
•
Yellow lamp requested
Noticeable external symptoms:
•
Yellow lamp lights up
•
The compressor "cycles" 20 s active, 60 s inactive
Appropriate check:
•
See “MID 146 SID 2 Temperature Sensor Evaporator,
Check” page 12
11
