ELECTRICAL SYSTEM
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Idle motor fl ow characteristics
The ECU controls the number of moving steps of the
stepper motor by controlling the number of times the
current direction of the coil is replaced, thereby adjusting
the cross-sectional area of the bypass channel and the
air flow through it.The flow characteristics of stepper
motors are shown on the left.
Fault diagnosis
ECU monitors various sensors, actuators, power amplifi er
circuits and detection circuits. Common fault codes are
shown in the fault summary table:
Three-in-one sensor fault inspection：
◆ Check that the connector is well connected
◆ Check whether the wiring harness and injector pins
are bent or deformed
◆ Measure the resistance between M pin and pin G
◆ Measure the voltage of M pin and ECU pin
◆ Measure the resistance of T pin and pin G
◆ Measure the resistance of P pin and pin G
Idle motor fault check:
◆ Check that the connector is well connected
◆ Check whether the wiring harness and injector pins
are bent or deformed
◆ Measure the resistance or voltage between each
stepping motor drive circuit connected to the ECU
and the ground
A
B
C
D
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