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Code
Alarm
238
TILLER ERROR
WRONG 0
VOLTAGE
EPS NOT
ALIGNED
239
EVP2 NOT OK
SAFETY OUT
WAITING FOR
TRAC
Pump
EPS
Traction
(P)
(E)
(T)
Description
Cause :
Mismatch between the H&S input and the tiller input.
Troubleshooting :
Check the harness related to CNA#1 and CNA#29 with
a voltmeter. If the state of these inputs is right, then it
could be a problem inside the controller, which has to be
changed.
Cause :
At start-up the high resolution VMN feedback is not
comprised in a permitted window of values centred
around 2.5V. The circuit is damaged in the controller.
Troubleshooting :
It is suggested to check :
- Motor internal connections (ohmic continuity)
- Motor power cables connections
- Motor leakage to truck frame
- If the motor connections are OK, the problem is inside
the controller, replace the logic board
This is a real alarm that cut off the traction. It occurs
when the system tries to perform an automatic centering
at key on but no straight ahead edge is detected within 6
secs. Check the straight ahead switch (SW1 to CNA#3)
is right working.
Cause :
The EVP2 driver is shorted.
A)
The microcontroller detects a mismatch between the
B)
valve set-point and the diver voltage measured on the
EVP2 output.
Troubleshooting :
Check if there is a short or a low impedance between the
negative of the coil and -BATT. Otherwise the driver
circuit is damaged and the controller must be replaced.
Cause :
The safety out driver is shorted.
Troubleshooting :
A)
Check if there is a short or a low impedance pull-down
between SAFETY OUT (CNA#19) and -BATT.
B)
The driver circuit is damaged in the logic board, which
has to be replaced.
This warning occurs only if CAN BUS is PRESENT. At
key-on the eps-ac0 needs an assent from the traction
controller to close the safety contacts and to turn onto
operational mode. Until this assent is not relieved, this
warning occurs. The steer is not activated yet and the
safety relays remain open when this warning is present.
7-94
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