charging system HONDA CIVIC 2002 7.G User Guide

Fuel and Emissions Systems
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System Descriptions (cont'd)
ldle Control System
When the engine is cold, the Ay'C compressor is on, the
transmission is in gear, the brake pedal is pressed. thepower steering load is high, or the alternator is
charging, the ECIM controls current to the ldle Air
Control (lAC) valve to maintain the correct idle speed.
Refer to the System Diagram to see the functional
layout of the system.
Brake Pedal Position Switch
The brake pedal position switch signals the ECM when
the brake pedal is oressed.
Electrical Power Steering (EPS) Senser
The EPS sensor signals the ECM when the power
steering load is high.
ldle Air Control llACl Valve
To maintain the proper idle speed, the IAC valve
changes the amount of air bypassing the throttle body
in response to an electrical signal from the ECM.
From AIR To INTAKECLEANER MANIFOLD
IAC VALVE
11-32
Fuel Supply System
Fuel Cut-off Control
During deceleration with the throttle valve closed,
current to the injectors is cut off to improve fuel
economy at engine speeds over 1,030 rpm. Fuel cut-off
action also occurs when engine speed exceeds
6,900 rpm, regardless of the position of the throttle
valve, to protect the engine from over-rewing. When
the vehicle is stopped. the ECM cuts the fuel at engine
speeds over 6,500 rpm.
Fuel Pump Control
When the ignition is turned on, the ECM grounds the
PGM-Fl main relay which feeds current to the fuel pump
for 2 seconds to pressurize the fuel system, With the
engine running. the ECM grounds the PGM-Fl main
relay and feeds current to the fuel pump. When the
engine is not running and the ignition is on, the ECI\4
cuts ground to the PGM-Fl main relay which cuts
current to the fuel pump.
PGM-FI Main Relay 1 and 2
The PGM-Fl main relay consists of two separate relays.
Relay 1 is energized whenever the ignition switch is ON(ll) to supply battery voltage to the ECM power to the
injectors, and power for relay, Relay 2 is energized to
supply power to the fuel pump for 2 seconds when the
ignition switch is turned ON (ll), and when the engine is
runnrng.

Heating and Air Conditioning
A/C Service Tips and Precautions
Compressed air mixed with R- 134a forms a
combustible vapor.
The vapor can burn or explode causing serious
injury.
Never use compressed air to pressure test
R-134a service equipment or vehicle air
conditioning systems.
Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
Be careful when connecting service equipment.
Do not breathe refrigerant or vapor.
The air conditioning system uses HFC-134a (R-134a)
ref rigerant and polyalkyleneglycol (PAG) ref rigerant oil,
which are not compatible with CFC'12 (R-12) refrigerant
and mineral oil. Do not use R-'12 refrigerant or mineral
oil in this system, and do not aftempt to use R 12
servicing equipment; damage to the air conditioning
system or your servicing equipment will result.
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove R-134a from the air conditioning system.
lf accidental system discharge occurs, ventilate the
work area before resuming service.
R-134a service equipment or vehicle air conditioning
systems should not be pressure tested or leak tested
with compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
. Always disconnect the negative cable from the
battery whenever replacing air conditioning parts.
. Keep moisture and dirt out of the system. When
disconnecting any lines, plug or cap the fittings
immediately; don't remove the caps or plugs until
iust be{ore you reconnect each line.' Before connecting any hose or line, apply a few drops
of relrigerant oil to the O-ring.. When tightening or loosening a fitting, use a second
wrench to support the matching fitting.. When discharging the system, use a R-'134a
ref rigerant recovery/recycling/charging station; don't
release refrigerant into the atmosphere.
21-6
A: 130 m0 {4 l/3 tl.oz,4.6 lmp.oz)
],^
A/C Refrigerant Oll Replacement
Recommended PAG oil: KEIHIN SP 10:
. P/N 38897-P l3-A01AH: '120 m0 i4 fl oz). P/N 38899-P13'A01: 40 m0 i1 1/3 fl oz)
Add the recommended refrigerant oil in the amount
listed if you replace any of the following parts.
. To avoid contamination. do not return the oilto the
container once dispensed, and never mix it with other
refrigerant oils.. lmmediately af'ter using the oil, reinstallthe cap on
the container, and seal it to avoid moisture
aosorpron.. Donotspill the refrigerant oil on the vehicle; it may
damage the paint. lf it gets on the paint, wash it off
immediately.
Condenser ...........25 mA \516 tl.oz, 0.9 lmp.oz)
Evaporator ........... 45 m0 (1 113Il.oz, '1.4 lmp.oz)
Line or hose ......... '10 m0 {1/3 fl.oz,0.4 lmp.oz)
Receiver/Dryer .... '10 m0 ('113 fl.oz,0.4 lmp.oz)
Leakage repai r .... 25 m0, 1516 Il oz, 0.9 lmp.oz)
Compressor ......... For compressor replacemenl,
subtract the volume of oil drained
from the removed compressor from
130 m0 (4 1/3fl.oz, 4.6lmp.oz), and
drain the calculated volume of oil
f rom the new compressor: '130 m0
i.4113 fl.oz,4.6 lmp.oz) Volume of
removed compressor = Volume to
drain from new compressor.
NOTE: Even if no oil is drained from
the removed compressor, don't
d rain more than 50 m0 \1 2/3 fl.oz,'1.8 lmp oz)from the new
compressor.
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REMOVEDCOMPBESSOR
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NEWCOMPRESSOR
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I I I DRAINING_*lH I voLUME

Heating and Air Gonditioning
System Description (cont'dl
The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the
system as shown below.
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BLOWER FAN
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EXPANSION VALVE(Meters the requiredamount of refrigerantinto the evaporator)
A/C PRESSURE SWITCHWhen the refriqerant is below196 kPa (2.0 kgi/cm',28 psi)or above 3,140 kPa (32 kgf/cm'455 psi), the Py'c pressureswitch opens the circuit tothe Py'C switch and stops theair conditioning to protect thecompressor-
RECEIVER/DRYER(Traps debris, andremoves morsturel
APOBATOR TEMPERATURESENSOR
THERMAL PROTECTOR(Opens the compressor clutch circuitwhen the compressot temperaturebecomes too high)
RELIEF VALVE(Relieves pressure at the compressorwhen the pressure is too high)
A/C COMPRESSOR(Suction and comoression)\-^
I HrcH PRESSURE vAPoR
[ '.... -:--l Low PREsSUBE LrourD
tffi Low PREssURE vAPoR
This vehicle uses HFC-134a (R-'134a) refrigerant which does not contain ch lorofluorocarbons. Pay attention to the
following service items:
. Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are notcompatible.. Use onlythe recommended polyalkyleneglycol (PAG ) refrigera nt oil (KElHlN SP '!0) designedfortheR-134a
compressor. Intermixing the recommended (PAG) refrigerant oil with any other retrigerant oil will result in
compressor failu re.. AllAy'C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer. expansion
valve, O-rings for joints) have to be designed for refrigerant R 134a. Do not exchange with R-'12 parts.
. Use a halogen gas leak detector designed for refrigerant R-134a.. R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning
system.. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting
any Ay'C fifting.
/-
CONDENSER(Radiation of heat)
21-12

Heating and Air Gonditioning
a
1.
Evaporator Core Replacement
Recover the refrigerant with a recovery/recycling/
charging station (see page 21-53).
Remove the bolt, then disconnect the suction line
(A) and the receiver line (B)from the evaporator
core.
6x10mm9.8 N.m (1.0 kgt.m, 7.2lbf.ft)
Remove the blower unit (see page 21-39).
Remove the self-tapping screws and the expansion
valve cover.
21-42
5. Carefully pull out the evaporator core without
bending the pipes.
Installthe core in the reverse order of removal, and
note these items.
. lfyou're installing a new evaporator core, add
refrigerant oil (KElHlN SP-]0) (see page 21-6).. Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-'134a) to avoid leakage.. lmmediatelyafter usingthe oil, reinstallthecap
on the container, and seal it to avoid moisture
absorotion.. Do not spill the refrigerant oil on the vehicle; it
may damage the paint. lf the refrigerant oil
contacts the paint, wash it off immediately.. Charge the system (see page 21-55).
6.

Compressor Replacement
1. lf the compressor is marginally operable, run the
engine at idle speed, and let the air conditioning
work for a few minutes, then shut the engine off.
2. Make sure you have the anti-theft code for the radio,
then write down the frequencies for the radio's
preset buttons.
3. Disconnect the negative cable from the battery.
4. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-53).
5. Remove the alternator (see page 4-29).
6. Remove the Ay'C condenser fan assembly (see page
10-10).
7. Disconnectthe compressor clutch connector (A),
remove the bolts, then disconnect the suction line(B) and the discharge line (C)from the compressor.
Plug or cap the lines immediately after
disconnecting them to avoid moisture and dust
contamination.
6 x '1.0 mm9.8 N.m11.0 kgt.m,7.2 tbl.ttl
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8. Remove the mounting bolts and the compressor.
8 x 1.25 mm22 N.m 12.2 kgf.m.
9. Installthe compressor in the reverse order of
removal, and note these items:
. Before installing the new compressor, check for
metal or other contamination in the line. Replace
any contaminated parts.. lf you're installing a newcompressor, you must
calculate the amount of refrigerant oil to be
removed from it (see page 21-6).. Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a {R-134a) to avoid leakage,. Use refrigerant oil (KElHlN SP-'10) for HFC-134a
KEIHIN spiral type compressor only.. To avoid contaminatlon, do not return the oilto
the container once dispensed, and never mix it
with other refrigerant oils.. lmmediately after using the oil, reinstallthe cap
on the container, and seal it to avoid moisture
absorption.. Do not spill the refrigerant oil on the vehicle; it
may damage the paint. lf the refrlgerant oil
contacts the paint, wash it off immediately.. Charge the system (see page 21-55).. Do the engine control module (ECM) idle learn
procedure (see page 11-'139).. Enter the antitheft code for the radio, then enter
the customer's radio station presets.
21-47

Compressor Thermal Protector
Replacement
1. Remove the bolt, the ground terminal (A), and the
holder (B). Disconnect the field coil connector (C).
then remove the thermal protector (D).
Replace the thermal protector (A) with a new one,
and apply silicone sealant (B) to the bottom of the
thermal Drotector.
A
3. lnstall in the reverse order of removal.
7.4 N.m(0.75 kgf.m,5 rbf.ftl
Compressor Relief Valve
Replacement
2.
1.
4.
Recover the refrigerant with a recovery/recycling/
charging station (see page 21-53).
Remove the relief valve (A) and the O-ring (B). Plug
the opening to keep foreign mafter from entering
the system and the compressor oil from running
out.
A9,8 N.m(1.0 kgf m,7.2lbf.ft)
Clean the mating surfaces.
Install a new O-ring on the relief valve, and apply a
thin coat of refrigerant oil to the O-ring.
Remove the plug, and install and tighten the relief
valve.
Charge the system (see page 21-55).
21-51

Heating and Air Conditioning
Gondenser Replacement
1.
6x1.0mm9.8 N.m ('1.0 kgf.m,7.2lbf.ft)
Recover the refrigerant with a recovery/recycling/
charging station (see page 21-53).
Remove the front bumper {see page 20-85).
Remove the bolts, then disconnect the discharge
line (A) and the condenser line (B) from the
condenser. Plug or cap the lines immediately after
disconnecting them to avoid moisture and dust
conlamtnaflon.
,t\
6x1.0mm9.8 N.m (1.0 kgt.m.7.2lbf.ft)
21-52
4, Remove the mounting bolts, then remove the
condenser by lifting it up. Be careful not to damage
the radiator or the condenser fins when removino
the condenser.
6 x '1.0 mm9.8 N.m ('1.0 kgf.m,7.2 tbl.ftl
5.lnstallthe condenser in the reverse order of
removal, and note these items.
. lf you're installing a newcondenser, add
refrigerant oil (KElHlN SP- 10) lsee page 21'6).. Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-'134a)to avoid leakage.. lmmediately after using the oil, reinstallthe cap
on the container, and seal it to avoid moisture
absorption.. Do not spillthe refrigerant oil onthevehicle;it
may damage the paint. lf the refrigerant oil
contacts the paint, wash it off immediately.. Be careful not to damage the radiator or the
condenser fins when installing the condenser.. Charge the system (see page 21-55).
t -"'.
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Refrigerant Recovery
Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose. or throat.
Be careful when connecting service equipment.
Do not breathe refrigerant or vapor
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove HFC-134a (R-134a) from the air conditioning
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1!l r: i t: -:
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1. Connect a R-134a refrigerant recovery/recycling/
charging station {A) to the high-pressure service
port (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer's
instructions.
lvleasure the amount of refrigerant oil removed
from the Ay'C system after the recovery process is
completed. Be sure to put the same amount of new
refrigerant oil back into the Ay'C system before
chargrng.
21-53

Heating and Air Conditioning
System Evacuation
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove HFC-134a (R-134a)from the air conditioninq
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. When an Ay'C system has been opened to the
atmosphere, such as during installation or repair, it
must be evacuated using a R-134a refrigerant
recovery/recycling/charging station (lf the system
has been open for several days, the receiver/dryer
should be replaced, and the system should be
evacuated for several hours.)
. Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.. Be carefulwhen connecting service equipment.. Do not breathe refrigerant or vapor.
21-54
2. Connect a R-134a refrigerant recovery/recycling/
charging station (A)to the high-pressure servicepon (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer's
instructions. Evacuate the system.
lf the low-pressure does not reach more than 93.3
kPa {700 mmHg, 27.6 in.Hg) in 15 minutes, there isprobably a leak in the system. Partially charge the
system, and check for leaks (see step 3 on page 21-
56).
-i - r4.t

System Charging
Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
Be carefulwhen connecting service equipment.
Do not breathe refrigerant or vapor,
Use only service equipment that is U.L.'listed and is
certified to meet the requirements of SAE J2210 to
remove HFC-134a {R-134a) from the air conditioning
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. Connect a R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure service
pon (B) and the low-pressure service port {C), as
shown, following the equipment manufacturer's
instructions.
2.
3.
4.
Evacuate the system (see page 21'54).
Add the same amount of new refrigerant oil to the
system that was removed during recovery. Use
only KEIHIN SP-10 refrigerant oil.
Charge the system with the specified amount of
R-134a refrigerant. Do not overcharge the system;
the compressor will be damaged.
Select the appropriate units of measure for your
refrigerant charging station.
Refrigerant capacity:
500 to 550 g
0.50 to 0.55 kg
1.10 to 1.21 lbs
17.6 to 19.4 oz
Check for refrigerant leaks (see page 21'56).
Check for system performance (see page 21-58).
21-55