EP Equipment CQD16, Service Manual

Page: 68 / 251

54
REV. 07/2016
DRIVE SYSTEM
5
Checking
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The vehicle is powered on, measure the
voltage between pin connector (80#) and
(83#) with a multimeter, normally should be
5V;
Check if the connection between 81# and 82#
is reversed. (If the two circuits are connected
reversely, the controller will report for failure,
and the instrument will display fault code:
BAD ENCODER SIGN)
Check “ENC SPEED” readings on TESTER
Menu (EPS-AC0). Operate the truck, if the
display is always “0”:
if it is steering motor speed encoder failure,
replace the encoder;
if it is steering motor encoder disc failure,
replace the motor; Speed Encoder
Speed encoder is used to detect the speed
of the motor and covert the speed into fixed
signals.
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Check if the motor encoder and the appear-
ance of cables are in good condition, and if
the plug connection is secure.
Remove the speed encoder and check its
sensing surface for wear.
Testing
5.6.4 Control Circuit Troubleshooting
Motor Control Circuit (Figure 90219)
Check if the circuit is broken by using a multi-
meter:
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Set the multimeter to ON-OFF;
Check if #80/#81/#82/#83 circuit (circuit
between motor encoder and controller) is
conducted;
Check if #84/#86 circuit (circuit between
motor temperature sensor and controller) is
conducted.