Categories
Fuel & Emissions

nsxe11072a.pdf

Idle Control System
Troubleshooting Flowchart Air Conditioning Signal
This signals the PGM-FI ECU when there is a demand for cooling from the air conditioning system.
Inspection of Air Condition-
ing Signal.
Connect the ECU test harness
between the ECU and connector.
Disconnect “C” connector from
the engine wire harness only, not
the ECU (page 11-21).
Turn the ignition switch ON.
Measure voltage between C3 (+)
terminal and A26 (-) terminal.
Is there approx. 10 V?
Substitute a known-
good ECU and re-
check. If prescribed
voltage is now avail-
able, replace the ori-
ginal ECU.
C3
A26
10 V
Turn the ignition switch OFF.
Reconnect “C” connector to the
engine wire harness.
Turn the ignition switch ON.
Momentarily connect A15 ter-
minal to A26 terminal several
times.
Is there a clicking noise from the
A/C compressor clutch?
Connect the RED/BLU terminal of
the 4P connector on the A/C
clutch relay to body ground.
RED/BLU
A 15
Short
A26
View from UNDER-HOOD
FUSE/RELAY BOX side
Start the engine.
Is there a clicking noise from the
A/C compressor clutch?
See air conditioner in-
spection (section 22).
Repair open in RED/BLU wire be-
tween ECU (A15) and A/C clutch
relay.
Blower switch ON.
(To page 11-73)

(From page 11-72)
Less than 1 V
C3
A26
A/C switch ON.
Does A/C operate ?
Air conditioning signal is OK.
Is voltage less than 1V?
Measure voltage between C3
( + ) terminal and A26 (-) ter-
minal.
Repair open in BLU/
BLK wire between ECU
(B5) and A/C switch.
Substitute a known-good ECU
and recheck. If symptom/indica-
tion goes away, replace the orig-
inal ECU.

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