2002 HONDA CIVIC coolant

Radiator Cap Test
1. Remove the radiator cap {A), wet its seal with
engine coolant, then install it on the pressure tester(B) (commercially available).
Apply a pressure of 93 '123 kPa {0.95 1.25
kgf/cm', l4 18 psi).
Check for a drop in pressure.
lf the pressure drops, replace the cap.
3.
4.
Radiator Test
Wait untilthe engine is cool, then carefully remove
the radiator cap and fill the radiator with engine
coolant to the top of the filler neck.
Attach the pressure tester (A) (commercially
available) to the radiator.
1.
3.
4.
Apply a pressure ot 93 '123 kPa (0.95 1 .25
kgf/cm', '14 18 psi).
Inspect for engine coolant leaks and a drop in
pressu re.
Remove the tester, and reinstall the radiator cap.
10-3

1.
2.
Water Pump Inspection
Remove the drive belt (see page 4-26),
Turn the water pump pulley counterclockwise.
Check that it turns freely.
Check for signs of seal leakage. A small amount of"weeping" from the bleed holes (A) is normal.
Water Pump Replacement
1. Remove the drive belt (see page 4-26).
2. Drain the engine coolant {see page 10-6).
3. Remove the crankshaft pulley (see page 6-11).
4. Remove the six bolts securing the water pump,
then remove the water pump (A).
6x1.0mm12 N m {1.2 kgt m,8.7 rbf.ft)
Inspect and clean the O-ring groove and mating
surface with the water passage.
Installthe water pump with new O rings in the
reverse order of removal.
7. Clean up any spilled engine coolant.
8. Installthe crankshaft pulley (see page 6-12).
L Refill the radiator with engine coolant, and bleed
air from the cooling system with the heater valve
open {see page 10-6}.
10-5

Cooling System
1 . Look at the coolant level in the reserve tank. Make
sure it is between the MAX mark (A) and MIN mark(B),
Goolant Check
lf the coolant level in the reserve tank is at or below
the MIN mark, add coolant to bring it up to the l\4AX
mark, and inspect the cooling system for leaks.
10-6
\-
Coolant Replacement
1.
\
Start the engine. Set the heater temperature control
dial to maximum heat. then turn off the ignition
switch. Make sure the engine and radiator are cool
to the touch.
Remove the radiator cap.
Remove the splash shield (see step 23 on page 5-5).
Loosen the drain plug (A), and drain the coolant.
Remove the reserve tank drain cap (A), and drain
the coolant.
\

1.
After the coolant has drained, tighten the radiator
drain plug securely. and installthe reserve tank
drain cap securely.
Fill the reserve tank to the MAX mark (A) with
Honda All Season Antifreeze/Coolant Tvpe 2
(P/N O1999-9001).
8. Pour Honda All Season Antifreeze/Coolant Type 2
into the radiator up to the base of the filler neck.
NOTE:. Always use Honda All Season Antifreeze/Coolant
Type 2 {P/N 01999-9001). Using a non-Honda
coolant can result in corrosion, causing the
cooling system to malfunction or fail.. Honda All Season Antifreeze/Coolant Type 2 is a
mixture of 50% antifreeze and 507o water. Pre-
mixing is not required.
Engine Coolant Refill Capacity including the
reserve tank capacity of 0.53 4 (0.56 US gtl :
5.0 0 (s.3 US qt)
Installthe radiator cap loosely.
Start the engine, and let it run until it warms up (the
radiator fan comes on at least twice).
Turn off the engine. Check the level in the radiator,
and add Honda All Season Antifreeze/Coolant Type
2 if needed.
Put the radiator cap on tightly, then run the engine
again and check for leaks.
lnstall the splash shield (see step 22 on page 5-12).
10.
11.
L
tJ.
10-7

Gooling System
Thermostat Replacement
1. Drain the engine coolant (see page 10-6).
2. Remove the splash shield (see step 23 on page 5-5).
3. Remove the lower hose, then remove the thermostat.
6x 1.0 mm9.8 N.m(1.0 kgf.m,7.2lbf ft)
a
u
i*
-
LOWER HOSE
4. Installthe thermostat with a new O-ring, then installthe lower hose.
5. Installthe splash shield (see step 22 on page 5-12).
6. Refillthe radiator with engine coolant, and bleed air from the cooling system with the heater valve open (see page
10_6).
THERMOSTAT
10-8
\_

Cooling System
Radiator and Fans Replacement
1. Drain the engine coolant (see page 10-6).
2. Remove the front bumper {see page 20,85).
3. Remove the bulkhead.
4. Remove the upper radiator hose and lower radiator hose.
DRAIN PLUG
UPPER BADIATOR HOSE
BAOIATOA FANASSEMBLY
{
O.RINGRADIATOR CAP
BADIATOB
LOWERCUSHION
\-
RADIATOR FANswtTcH24Nm{2.1t kgl m. 17lbl hl
LOWER FADIATORHOSE
RESERVETANK
A/C CONDENSERFAN ASSEMBLY
9.8 N m {1.0 kgf m,7.2 lbf ft)CONNECTORSRADIATOB FAN SWITCHCONNECTOB
5. Disconnect the fan motor connectors and radiator fan switch connector, then pull the radiator up and out.
6. Remove the fan shroud assemblies and other parts from the radiator.
7. Installthe radiator in the reverse order of removal. Make sure the upper and lower cushions are set securelV.
8. Install the bulkhead in the reverse order of removal. Apply body paint to the bulkhead mounting bolts.
9. Fill the radiator with engine coolant and bleed the air (see page 10-6).
10-10
\.

DTC Troubleshooting Index
";These DTCs are indicated by a blinking malfunction indicator lamp (MlL)when the SCS service signal line isjumped with the Honda PGM Tester.
{cont'd)
11-7
DTC
{MlL indication*)
Temporary DTCDetection ltemNote
P0010 (56)Variable Valve Timing Control {VTC) Oil Control
Solenoid Valve Malfunction
{see page 1 1'1 18)
P0011 (56)P001 1Variable Valve Timing Control (WC) System
Malfunction
(see page 11- 1 19)
P0107 (3)Manifold Absolute Pressure (MAP) Sensor Circuit
Low Voltaqe
(see page 1'l-521
P0108 (3)Manifold Absolute Pressure (MAP) Sensor Circuit
Hiqh Voltaqe
(see page 11-53)
P0112 (10)Intake Air Temperature (lAT) Sensor Circuit Low
Voltaoe
(see page 11-55)
P01r3 (10)Intake Air Temperature (lAT) Sensor Circuit High
Voltaoe
(see page '11-56)
P0116 {86) P0116Englne Coolant Temperature (ECT) Sensor Range/
Performance Problem
{see page 11-57)
P0117 {6)Engine Coolant Temperature (ECT) Sensor Circuit
Low Voltaqe
(see page 11-58)
P0118 {6)Engine Coolant Temperature (ECT) Sensor Circuit
Hiqh Voltaqe
{see page 11-59)
P0122 t7\Throttle Position (TP) Sensor Circuit Low Voltaqe(see Daqe 11-60)P0123 {7)Throttle Posltion (TP) Sensor Circuit Hiqh Voltaoe(see paqe 11-62)
P0128 (87)P0128Coolinq SVStem Malfunction(see Daqe 11-64)
P0134 (41)Air Fuel Ratio (Ay'F) Sensor (Sensor 1) No Activity
Detected
(see page 11-65)
P0137 (63)P0137Secondary Heated Oxygen Sensor (Secondary HO2S)(Sensor 2) Circuit Low Voltaqe
(see page 11-65)
P0138 (63)P0138Secondary Heated Oxygen Sensor (Secondary HO2S)(Sensor 2) Circuit Hiqh Voltaqe
(see page 11-66)
P0139 (63)P0139Secondary Heated Oxygen Sensor (Secondary H02S)(Sensor 2) Slow ResDonse
(see page 11-67)
P0141 (65)Secondary Heated Oxygen Sensor (Secondary H02S)(Sensor 2) Heater Circuit Malfunction
(see page 11-68)
P0171 (45)PO\11Fuel Svstem Too Lean(see paqe 11-70)
PO112 l'45)PO\l2Fuel System Too Rich(see oaoe 11-70)
P0300 and any P0300 and any
of of
P0301 (71) P0301
PO302 (721 P0302
P0303 (73) P0303
P0304 (74) P0304
Random Misfire(see page 11-71)
P0301 (7'1) P0301No. 1 Cylnder Misfire{see page 11-72)
P0302 (721 P0302No. 2 Cvlnder Misfire{see paqe 1 1-72)
P0303 (73)P0303No. 3 Cvlnder Misfire(see oaqe 11-72)
P0304 {74)P0304No. 4 Cvlnder Misfire{see Daqe 1 1-72)

ECM Data
You can retrieve data from the ECI\4 by connecting the OBD ll scan tool or the Honda PGM Tester to the data link
connector (DLC). The items listed in the table below conform to SAE recommended practice. The Honda PGM Tester
also reads data beyond that recommended by SAE to help you find the causes of intermittent problems.
The "operating values" listed are approximate and may vary depending on the environment and the individual
vehicle.
Unless noted otherwise, "at idle speed" means idling with the engine completely warmed up in the neutral position,
and the A,/C and all
Diagnostic
Trouble Code(DTC}
lf the ECM delects a problem, it will store it as a code
consisting of one letter and four numbers. Depending on
the problem, an SAE-defined code (Poxxx) or a Honda,
defined code {P1xxx) will be output to the tester.
The ECI\4 computes engine speed from the signals sent
from the crankshaft position (CKP) sensor. This data is
used for determining the time and amount of injected fuel.
detected, there is no
ourpul.
lf no problem is YES
Nearly the same as
tachometer indication
At idle speed;
The ECM converts pulse signals from the vehicle speed
sensor (VSS).Nearly the same as
speedometer
indication
Manifold
Absolute
Pressure(MAP)
The absolute pressure caused in the intake manifold by
engine load and speed.
With engine stopped: YES
Nearly the same as
almospnenc pressure.
At idle speed: about
20 4'1 kPa(150 310 mmHg,
6- 12 in.Hq).0.7 1.3 V
The ECT sensor converts coolant temperature into voltage
and signals the ECM. The sensor is a thermistor whose
internal resistance changes with coolant tempetature. The
ECM uses the voltage signals from the ECT sensor to
determine the amount of injected fuel.
With cold engine:
Same as ambient
temperature and IAT
With engine warmed
up; about 116 2'12"F
100'c).0.5-0.8 v
Air Fuel Ratio The A,/F sensor detects the oxygen content in the exha ust 0.0 - 1 .25 V(Ay'F) Sensor. gas and sends voltage signals to the Eclvl, Basedonthese 8.0 11.0mA(PGM(Sensor 1) signals, the ECM controls the airlfuel ratio. When the I Tester)
oxygen content is high (that is, when the ratio is leaner At idle speed:
than the stoichiometric ratio), the voltage signal is Iower. about 0.1 0.9 V
When the oxygen content is low (that is, when the ralio is
richer than the stoichiometric ratio). the voltage signal is
higher. The A'lF sensor signals are electrical current that
are indicated as voltaqe on the
The HO2S detects the oxygen content in the exhaust gas
and sends voltage signals to the ECM. Based on these
signals, the ECM controls the airlfuel ratio. When the
oxygen content is high (that is, when the ratio is leaner
than the stoichiometric ratio), the voltage signal is lower.
When the oxygen content is low (that is, when the ratio is
richer than the stoichiometric ratio), the voltage signal is
Secondary
Heated
Oxygen
Sensor(Secondary
H02S,
Sensor2)
0.0 1.25 V NO
At idle speed:
about 0.1 0.9 V
(cont'd)
11-13