Acura NSX 1991 Manual page 266

Main Menu
Fuel Supply System
PGM-FI Main Relay
(From page 11-145)
Check for an open in the wire:
1. Reconnect the ECM connector
A (26P).
2. Reconnect the PGM-FI main
relay 4P and 8P connectors.
3. Turn the ignition switch ON (II).
4. Measure voltage between
ECM connector terminals
A13, C1, and A12.
Is there battery voltage?
Check for an open in the ECM:
1. Turn the ignition switch OFF.
2. Measure voltage between
ECM connector terminals A4
and A12 when the ignition
switch is first turned on for
two seconds.
Is there 1.0 V or less?
Check the PGM-FI main relay
(see page 11-143).
Table of Contents
Repair open in the wire
between the ECM (A13, CD
and the PGM-FI main relay.
Replace the PGM-FI main
relay.
Substitute a known-good ECM
and recheck. If prescribed volt-
age is now available, replace the
original ECM.
ECM CONNECTORS
WIRE SIDE OF FEMALE TERMINALS