Honda Acura NSX 1991 Service Manual page 738

to 4-8: Speed Sensor
Problem Code 4-1
only
CAUTION: Use the digital multimeter to check the
Disconnect the wire harness
from speed sensor.
Check for resistance between
the sensor terminals.
Y E S
Disconnect the 20P connector
from the control unit.
Check each wire for continuity
between the sensor and control
unit:
GRNIBLU: Front Left Positive
LT BLU: Rear Left Positive
GRN: Front Right Negative
BRN: Front Left Negative
Rear Right Negative
GRY: Rear Left Negative
Check for continuity to ground.
Is there continuity?
Check for loose control unit con-
system.
FRONT LEFT
REAR LEFT
LT BLU
Faulty speed sensor.
BRN: FL 0
GRN: FR 0
GRY:
View from control unit terminal side.
Repair open in sensor wire:
GRNIBLK: Front Right Positive GRN: Front Right Negative
GRNIBLU: Front Left Positive
LT BLU: Rear Left Posltive
Repair short in sensor wire.
SENSOR SIDE CONNECTOR
FRONT RIGHT
REAR RIGHT
G R Y
View from terminal side.
GRNIBLK: FR @
BRN: Front Left Negative
Rear Right Negative
GRY: Rear Left Negative
RR @