Acura NSX 1991 Manual page 240

Main Menu
Automatic Transaxle (A/T) Gear Position Signal
This signals the ECM when the transmission is in
Inspection of A/T Gear Position
Signal.
Check the operation of the A/T
gear position switch:
1. Turn the ignition switch ON (II).
2. Observe the A/T shift position
indicator and select each posi-
tion separately.
Does the indicator light prop-
erly?
Check for a short in the circuit:
1. Turn the ignition switch OFF.
2. Disconnect the 30P (C412)
connector from the gauge
assembly.
3. Disconnect the 26P connector
from the TCM.
4. Turn the ignition switch ON (II).
5. Measure voltage between
ECM connector terminals B4
and A26.
Is there approx. 5 V?
(To page 11-122)
Table of Contents
position.
See the A/T gear position indica-
tor inspection (see section
Check for a short in the wire:
1. Turn the ignition switch OFF.
2. Disconnect the ECM connector
B (16P) from the ECM.
3. Check for continuity between
ECM connector terminal B4
and body ground.
Is there continuity?
Substitute a known-good ECM
and recheck. If prescribed voltage
is now available, replace the origi-
nal ECM.
14).
ECM CONNECTORS
WIRE SIDE OF FEMALE TERMINALS
Repair short in the wire between
the ECM (B4) and the gauge
assembly.