Honda Acura NSX 1991 Service Manual page 621

Troubleshooting
-Flowcharts
Problem code 11, 12, 13 and 14:
l Torque sensor related problems.
ignition
Turn the switch OFF.
Connect the EPS test harness A.
Check the voltage between the
A7 (+) and A10 (-1 terminals.
Y E S
Position
the steering wheel so the
front wheels are pointing straight
ahead. Release the streering
wheel and check the voltage be-
terminals indicated in
tween the
the chart on the right and Al 0 (- )
terminal.
Turn the steering wheel to the left
side and gradually apply force
when the wheel is turned all the
way to the left. At this time,
check the voltage between the
terminals indicated in the chart on
the right and A10 f-1 terminal.
Turn the steering wheel to the
right and use the same method to
check the voltage.
Are all the voltages within the
standard values?
N O
(To page 17-53)
Substitute a known-good EPS
control unit and recheck.
Chart of Standard Output Values
I
Test harness Standard Value (V)
A terminal
Straight
No. (Name)
ahead
A l 6 ( V T , )
A l 7 (VTJ
A l 4 (REF 2 . 5 ) 2.52 0 . 1 7
A10 (GND)
wheels are straight
the
NOTE: The indication (* 1 I--(0.25) means that the vol-
tage decreases 0.25 V maximum when the steering
wheel is turned compared to the VT1 value when the
wheels are positioned straight ahead.
NOTE: The output variations
of VT,, VT2
and VT3 must cor-
respond to the manually applied
force.
Substitute a known-good EPS
control unit and recheck.
,
Turned to
Turned to
the left the right
2 . 5 k 0 . 1 7