ACURA NSX 1991 Service Repair Manual

ACURA NSX 1991 Service Repair Manual NSX 1991 ACURA ACURA https://www.carmanualsonline.info/img/32/56988/w960_56988-0.png ACURA NSX 1991 Service Repair Manual
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Page 1491 of 1640

ACURA NSX 1991  Service Repair Manual 
Idle Control System

Troubleshooting Flowchart
 A/T Shift Position Signal

This signals the PGM-FI ECU when the transmission is in Neutral or Park.
 Inspection of A/T Shift Position
Signal.

Turn the

Page 1492 of 1640

ACURA NSX 1991  Service Repair Manual 
(From page 11-76)
Less than 1 V
B7

A26

Measure voltage between B7

( + ) terminal and A26 (-) ter-

minal with the transmission in
 Is there less than 1 V?
Repair open in LT GRN wire
between ECU (B

Page 1493 of 1640

ACURA NSX 1991  Service Repair Manual 
Idle Control System

Troubleshooting Flowchart
 
 M/T Neutral Switch Signal
This signals the PGM-FI ECU when the transmission is in Neutral.
Inspection of M/T neutral Switch

Signal

Connect the ECU

Page 1494 of 1640

ACURA NSX 1991  Service Repair Manual 
Idle Control System

Troubleshooting Flowchart
 Clutch Switch Signal
This signals the PGM-FI ECU when the clutch is engaged.
Inspection of clutch switch

signal.

Connect the ECU test harnessbetween

Page 1495 of 1640

ACURA NSX 1991  Service Repair Manual 
(From page 11-80)
Is there approx. 10V?

Clutch switch signal is OK.
 Turn the ignition switch OFF.
Disconnect the 3P connector
from the clutch switch.

Turn the ignition switch ON.

Measure voltage

Page 1496 of 1640

ACURA NSX 1991  Service Repair Manual 
Idle Control System
Troubleshooting Flowchart
 
 Starter Switch Signal

This signals the PGM-FI ECU when the engine is cranking.

Inspection of Starter Switch

Signal.
  
 BATTERY

VOLTAGE?
 C 11

A2

Page 1497 of 1640

ACURA NSX 1991  Service Repair Manual 
Fast Idle Valve
Description
To prevent erratic running when the engine is warming up, it is necessary to raise the idle speed. The fast idle
air bypass valve is controlled by a thermowax plunger.
Whe

Page 1498 of 1640

ACURA NSX 1991  Service Repair Manual 
Idle Control System

Idle Speed Setting

Inspection/Adjustment
 1. Start the engine and warm it up to normal operating temperature (the cooling fan comes on).
2. Connect a tachometer. Connect a tacho

Page 1499 of 1640

ACURA NSX 1991  Service Repair Manual 
6. Turn the ignition switch OFF.

7. Reconnect the 2P connector on the EACV, then

remove CLOCK fuse in the under-hood fuse/relay

box for 10 seconds to reset ECU.

8. Restart and idle the engine wit

Page 1500 of 1640

ACURA NSX 1991  Service Repair Manual 
Fuel Supply System

System Troubleshooting Guide

NOTE: Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they should be inspected starting with . F
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