Honda Acura NSX 1991 Service Manual page 1119

-Speed Sensor Input Test
NOTE: Check the No. 2 (I 5 A) fuse in the dash fuse box,
before tesing.
Disconnect the 3-P connector from the speed sensor.
1 .
View from
terminal side
2. Check for continuity between the BLK terminal and
the body ground.
There should continuity.
3. Check for voltage between the BLK/YEL terminal and
the body ground with the ignition switch ON.
There should be battery voltage.
If there is no voltage, check for an open in the
l
4. Check for voltage between the YEL/RED terminal and
body ground with the ignition switch ON.
There should be approximately 5 V.
terminal of the A connector. (See page 23- 123)
l If there is approximately 5 V, go to step 5.
5. If all continuity and voltage tests are normal, but the
speedometer and the odoltripmeter
replace the speed sensor.
-Replacement
1 . Disconnect the 3-P connector from the speed sensor.
2. Remove the mounting bolts and the speed sensor,
then take out the speed sensor assembly.
SPEED SENSOR
3. Install in the reverse order of removal.
NOTE: Be careful not to lose the joint shaft, because
it is a tiny part.
do not operate,
MOUNTING BOLTS
23-133