Note:
1. The error code corresponds to the following two situations:
a. If there is only one electronic expansion valve port on the main control board of the IDU, when an
error occurs in the electronic expansion valve coil connected to the EXV port, the error code is b05.
b. If there are two electronic expansion valve ports on the main control board of the IDU named
EXV1 and EXV2, when an error occurs in the electronic expansion valve coil connected to port
EXV1, the error code is b05; when an error occurs in the electronic expansion valve coil connected
to port EXV2, the error code is b07.
2. In Figure 1 below: The numbers 1 to 5 stand for the pins of different colours paired with
individual wires which have the same colour as the pin. 5(com) is a pin of the common terminal,
and number 6 is a null pin without any wire connected; an XHP coil plug is used to connect to the
EXV port of the main control board, and an APM coil plug is used to connect to the A-direction plug
of the adapter wire (see Figure 2 below). Table 1 shows the resistance between pin 1-4 and pin 5
(the common terminal) when the electronic expansion valve coil is in a normal state. If the
resistance is near zero or significantly deviates from its normal state, the coil is damaged.
3. When the distance between the throttle part and the main control board of the IDU in need of
connection is too great, you will need an adapter wire for the electronic expansion valve coil. This
is shown in Figure 2 below: Use a multimeter to measure the resistance between the pin in the
plug at end A of each wire and at end B. A resistance value close to 0 indicates a short circuit has
occurred in the wire, and a resistance value close to infinity indicates an open circuit of the wire.
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