engine HONDA PRELUDE 1992 Repair Manual

Charging System Indication

The charging system light should
go out after the engine starts. If it
comes on brightly with the engine
running, the alternator is no longer
charging the battery. Immediately turn off all electrical
accessories: radio, heater, A/C, rear
defogger, cruise control, etc. Try
not to use other electrically-
operated controls such as the
power windows. Keep the engine
running and take extra care not to
stall it. Starting the engine will discharge the battery rapidly. By eliminating as much of the

electrical load as possible, you can

drive several miles before the
battery is too discharged to keep
the engine running. Drive to a
service station or garage where you
can get technical assistance.

Taking Care of the Unexpected
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Check Engine Light
If the
check engine light comes on
while driving, there is a problem with your engine or its emissioncontrol systems. Even though you
may feel no difference in your car's
performance, it can reduce your
fuel economy and cause your car to put out excessive emissions.
Continued operation may cause
serious engine damage. If this light comes on, safely pull
off the road and turn off the engine.
Restart the engine and watch the
check engine light. If it stays on,
have your car checked by the dealer as soon as possible. You
should also have the dealer inspect
your car if the light comes on
frequently, even though it goes off
when you do the above procedure. If you keep driving with the check
engine light on, you can damage
your car's emission controls and
engine. Those repairs are not
covered by your car's warranties.

Taking Care of the Unexpected

CHECK ENGINE LIGHT

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Fuses

All the electrical circuits in your
car have fuses to protect them
from a short circuit or overload.
These fuses are located in two fuse

boxes.

The underhood fuse box is locatedin the engine compartment next to
the battery. To open, push the tab

as shown.
The interior fuse box is underneath
the dashboard on the driver's side.
To open, turn the knob as shown.

CONTINUED
Taking Care of the Unexpected

UNDERHOOD

TAB

KNOB

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Towing

If your car needs to be towed, call a
professional towing service or, if
you belong to one, an organization
that provides roadside assistance.
Never tow your car behind another car with just a rope or chain. It is
very dangerous.

Emergency Towing

There are three popular methods of
towing a car:
Flat-bed Equipment — The

operator loads your car on the back

of a truck. This is the best way

of transporting your Honda.

Wheel Lift Equipment — The tow
truck uses two pivoting arms that
go under the tires (front or rear)
and lift them off the ground. The
other two wheels remain on the

ground.
Sling-type Equipment — The tow
truck uses metal cables with hooks

on th
e
ends. These hooks go around

parts of the frame or suspension

and the cables lift that end of the

car off the ground. Your car's sus-

pension and body can be seriously

damaged if this method
of towing

is attempted.
If your Honda cannot be trans-
ported by flat-bed, it should be

towed with the front wheels off the

ground. If due to damage, your car

must be towed with the front

wheels on the ground, do the
following:

5-Speed Transmission
Release the parking brake.
Shift the transmission to Neutral.

Automatic Transmission
Release the parking brake.
Start the engine.
Shift to D4, then to N.
Turn off the engine. Improper towing preparation will
damage the transmission. Follow
the above procedure exactly. If you
cannot shift the transmission or
start the engine (automatic trans-
mission), your car must be trans-
ported on a flat-bed. It is best to tow the car no far-
ther than 80 km (50 miles), and
keep the speed below 35 mph (55
km/h).

Trying to lift or tow your car by
the bumpers will cause serious
damage. The bumpers are not

designed to support the car's

weight.

Taking Care
of the Unexpected NOTICE
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Identification Numbers

Your car has several identifying numbers located in various places.
The Vehicle Identification Number
(VIN) is the 17-digit number your
Honda dealer uses to register your car for warranty purposes. It is also
necessary for licensing and insur- ing your car. The easiest place to
find the VIN is on a plate fastened
to the top of the dashboard. You
can see it by looking through the
windshield on the driver's side. It is
also on the Certification label at-
tached to the driver's door jamb,
and is stamped on the engine com-
partment bulkhead. The VIN is
also provided in bar code on the
Certification label.

Technical Information
VEHICLE IDENTIFICATION NUMBER
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Identification Numbers
The Engine Number is stamped
into the engine block.
The Transmission Number is on a
label on top of the transmission.

ENGINE NUMBER
Technical Information

MANUAL TRANSMISSION NUMBER
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Specifications

* 1 : US: S, Canada: S

* 2 : US: Si, Si 4WS, Canada: SR, SR 4WS *
1 : Including the coolant in the reserve tank and that remaining in the engine.
Reserve tank capacity:
0.6 (0.16 US gal,0.13 Imp gal)

* 2 : US: S, Canada: S

* 3 : US: Si, Si 4WS, Canada: SR, SR 4WS
* 4 : Excluding the oil remaining in the engine.

Technical Information
page 152ProCarManuals.comMain Menu Table of Contents s t

Emission Controls

The burning of gasoline in your
car's engine produces several by-
products. Some of these are carbon
monoxide (CO), oxides of nitrogen
(NOx) and hydrocarbons (HC).
Gasoline evaporating from the tank
also produces hydrocarbons. Con-
trolling the production of NOx, CO,
and HC is important to the environ-
ment. Under certain conditions of
sunlight and climate, NOx and HC
react to form photochemical "smog."
Carbon monoxide does not contri-
bute to smog creation, but it is a
poisonous gas.
The Clean Air Act

The United States Clean Air Act*
sets standards for automobile
emissions. It also requires that
automobile manufacturers explain
to owners how their emission
controls work and what to do to
maintain them. This section
summarizes how the emission con-
trols work. Scheduled maintenance

is on page 129 .

* In Canada, Honda vehicles

comply with the Canadian Motor
Vehicle Safety Standards (CMVSS)
for Emissions valid at the time they

are manufactured.
Crankcase Emission Control

System

Your car has a Positive Crankcase
Ventilation (PCV) System. This
keeps gasses that build up in the engine's Crankcase from going into
the atmosphere. The PCV valve
routes them from the crankcase
back to the intake manifold. They
are then drawn into the engine and

burned.

Evaporative Emission
Control SystemAs gasoline evaporates in the fuel
tank, a canister filled with charcoal
adsorbs the vapor. It is stored in
this canister while the engine is off.
After the engine is started and
warmed up, the vapor is drawn into the engine and burned during

driving.

Technical Informatio n
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Emission Controls

Exhaust Emission Controls

The exhaust emission controls
include four systems: PGM-FI,
Ignition Timing Control, Exhaust
Gas Recirculation and Catalytic
Converter. These four systems
work together to control the engine's combustion and minimize
the amount of HC, CO, and NOx
that comes out the tailpipe. The
exhaust emission control systems
are separate from the crankcase
and evaporative emission control

systems.

PGM-FI System
The PGM-FI System on your car
has three sub systems: Air Intake,
Electronic Control, and Fuel
Control. The Electronic Control
Unit (ECU) uses various sensors to
determine how much air is going
into the engine. It then controls
how much fuel to inject under all
operating conditions. Ignition Timing Control System
This system constantly adjusts the
ignition timing, reducing the
amount of HC, CO and NOx

produced.

Exhaust Gas Recirculation (EGR)
The EGR system takes some of the
exhaust gas and routes it back into
the intake manifold. Adding ex-
haust gas to the air/fuel mixture re-
duces the amount of NOx produced
when the fuel is burned.
Catalytic Converter
The catalytic converter is in the exhaust system. Through chemical
reactions, it converts HC, CO, and
NOx in the engine's exhaust to
carbon dioxide (CO 2), dinitrogen
(N 2), and water vapor.
Replacement Parts

The emission control systems are

designed and certified to work to-

gether in reducing emissions to
levels that comply with the Clean

Air Act. To make sure the emis-
sions remain low, you should use

only new genuine Honda replace-

ment parts or their equivalent for

repairs. Using lower quality parts
may increase the emissions from

your car .

The emissions control systems are

covered b y
warranties separate

from the rest of your car. Read

your warranty manual for more
information.
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Catalytic Converter
The catalytic converter contains
platinum and rhodium. These
metals serve as catalysts, pro-
moting chemical reactions to con-
vert the exhaust gasses without
affecting the metals. The catalytic
converter is referred to as a three-
way catalyst, since it acts on HC, CO, and NOx. A replacement unit
must be an original Honda part or
its equivalent.
The catalytic converter must ope-
rate at a high temperature for the
chemical reactions to take place. It
can set on fire any combustible
materials that come near it. Park your car away from high grass, dry
leaves, or other flammables. A defective catalytic converter
contributes to air pollution, and can
impair your engine's performance.
Follow these guidelines to protect
your car's catalytic converter.
Always use unleaded gasoline.
Even a small amount of leaded
gasoline can contaminate the
catalyst metals, making the
converter ineffective. Keep the engine tuned-up.Have your car diagnosed and
repaired if
it is misfiring, back-
firing, continuing to run after
you turn off the engine, stalling,
or otherwise not running proper-
ly.

Technical Information

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