Nissan Frontier D22. Manual - part 233

ENGINE CONTROL SYSTEM

EC-35

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SYSTEM DESCRIPTION

If the engine speed is above 3,000 rpm under no load, (for example, the shift position is Neutral and engine
speed is over 3,000 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.

NOTE:
This function is different from deceleration control listed under 

EC-31, "Multiport Fuel Injection (MFI)

System"

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Fast Idle Cam (FIC)

UBS00D13

COMPONENT DESCRIPTION

The FIC is installed on the throttle body to maintain adequate engine
speed while the engine is cold. It is operated by a volumetric change
in wax located inside the thermo-element. The thermo-element is
operated by engine coolant temperature.
For inspection refer to 

EC-74, "Basic Inspection"

 .

SEF500V

EC-36

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BASIC SERVICE PROCEDURE

BASIC SERVICE PROCEDURE

PFP:00018

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment

UBS00D14

PREPARATION

1.

Make sure that the following parts are in good order.

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Battery

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Ignition system

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Engine oil and coolant levels

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Fuses

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ECM harness connector

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Vacuum hoses

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Air intake system
(Oil filler cap, oil level gauge, etc.)

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Fuel pressure

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Engine compression

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EGR valve operation

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Throttle valve

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EVAP system

2.

On models equipped with air conditioner, checks should be carried out while the air conditioner is
“OFF”.

3.

On models equipped with automatic transmission, when checking idle speed, ignition timing and
mixture ratio, checks should be carried out while shift lever is in P or N position.

4.

When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.

5.

Turn switch OFF headlamp and heater blower.

6.

Keep front wheels pointed straight ahead.

BASIC SERVICE PROCEDURE

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OVERALL INSPECTION SEQUENCE

NOTE:
If a vehicle contains a part which is operating outside of design specifications with no MIL illumina-
tion, the part shall not be replaced prior to emission testing unless it is determined that the part has
been tampered with or abused in such a way that the diagnostic system cannot reasonably be
expected to detect the resulting malfunction.

SEF554YA

EC-38

[KA24DE]

BASIC SERVICE PROCEDURE

INSPECTION PROCEDURE

1. 

INSPECTION START

1.

Visually check the following:

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Air cleaner clogging

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Hoses and duct for leaks

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EGR valve operation

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Electrical connectors

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Gasket (intake manifold, cylinder head, exhaust system)

–

Throttle valve and throttle position sensor operation

2.

Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine speed stays below 1,000 rpm.

3.

Open engine hood and run engine at about 2,000 rpm for about
2 minutes under no-load.

4.

Make sure that no DTC is displayed with CONSULT-II or GST.

OK or NG

OK

>>

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GO TO 2 (With CONSULT-II).

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GO TO 3 (Without CONSULT-II).

NG

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Repair or replace components as necessary.

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GO TO 2 (With CONSULT-II).

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GO TO 3 (Without CONSULT-II).

SEF810K