Acura NSX 1991 Manual page 793

Main Menu
Speedometer/Trip Meter/Odometer
Troubleshooting
(From page 23-131)
Connect the Test Harness (07LAJ —
PT3020A) between the VSS and
the engine wire harness.
Raise the rear of the car, and sup-
port it with stands.
Back-probe the ORN wire, and
connect it to body ground through
a voltmeter.
Put the car in neutral with the
ignition switch ON (II).
Slowly rotate one wheel with the
other wheel blocked.
Does voltage pulse from 0 to
about 5 or more V?
Disconnect the 30-P connector at
the speedometer.
Back-probe the ORN wire, and
connect it to body ground through
a voltmeter.
Slowly rotate one wheel with the
other wheel blocked.
Does the voltmeter indicate
pulsing voltage?
Replace the speedometer.
Table of Contents
TEST HARNESS
07LAJ - PT3020A
Replace the VSS (see page
23-133).
Repair open in the ORN wire,
between the VSS and the
speedometer.
WHT TEST HARNESS
CLIP
VSS
GRN TEST HARNESS CLIP
RED TEST HARNESS
CLIP
PROTECTIVE
TAPE