2002 HONDA CIVIC ECU

Piston Installation
lf the crankshaft is already installed
1. Setthe crankshaftto bottom dead center (BDC) for
each cylinder.
2. Remove the connecting rod caps, then install the
ring compressor, and check that the bearing is
securely in place,
3. Position the arrow {A) facing the cam chain side of
rne engtne.
Position the piston in the cylinder, and tap it in
using the wooden handle of a hammer (A).
N4aintain downward force on the ring compressor(B) to prevent the rings from expanding before
entering the cylinder bore.
Stop after the ring compressor pops free, and
check the connecting rod-to-crank journal
alignment before pushing the piston into place.
Check the connecting rod bearing clearance withplastigage (see page 7-8).
lnspect the connecting rod bolts (see page 7 241.
Apply engine oil to the bolt threads, then install the
rod caps with bearings. Torque the bolts to 20 N.m
{2.0 kgf m, 14 lbf ft) + 90'.
6.
7.
2.
1.
lf the crankshaft is not installed
Remove the connecting rod caps. then install the
ring compressor, and check that the bearing is
securely in place.
Position the arrow (A)facing the cam chain side of
Ine engrne.
Position the piston in the cylinder, and tap it in
using the wooden handle of a hammer (A),
Maintain downward force on the ring compressor(B) to prevent the rings from expanding before
entering the cylinder bore.
4. Position all pistons attop dead center.
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7-23

Intake Manifold and Exhaust System
Intake Manifold Removal and Installation (cont'dl
5. Be prepared to catch and clean up spilled coolant.
Remove the water bypass hoses, then plug the
water bypass hoses.
6. Relievefuel pressure (see page 11-'144).
7. Remove the fuel line (seepagell-149).
8. Remove the positive crankcase ventilation (PCV)
hose (A), harness holder mounting bolt (B) and
harness clamp mounting bolt (C).
9-4
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9.Remove the engine wire harness connectors and
wire harness clamps from the intake manifold.
. Four injector connectors. ldle air control (lAC) valve connector. Throttle position (TP) sensor connector. fvlanifold absolute pressure {lvlAP) sensor
connector. Evaporative emission (EVAP)canister purge
valve connector
Remove the bolt securing the intake manifold and
bracket.
'1 0.
11.Remove allthe intake manifold mounting bolts/
nuts.
Remove the two stud bolts (A), then remove the
intake manifold (B).
1'>

1. Install the intake manifold (A)with a new gasket (B),
then install and tighten the two stud bolts (C).
8 x 1.25 mm22 N.m|.2.2k91.m.16 tbt.ft)
8 x 1.25 mm22 N.rn(2.2 kgf m. 16 lbf.ttl
Tighten all intake manifold mountlng bolts/nuts in a
crisscross pattern in two or three steps, beginning
with the inner bolt.
Tighten the bolt securing the intake manifold and
bracket.
8 x 1.25 mm22 N.m (2.2 ksf m, 16lbf.ft)
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4.
7.
5.
6.
Install the PCV hose {A), harness holder mounting
bolt (B), and harness clamp mounting bolt (C).
e-li*h,r
6x1.0mm12 N.m (1.2 kgf.m,8.7 lbf.ft)
Installthe fuel line (see page 11-150).
Installthe water bypass hoses.
Install the th rottle cable (see page 1 1-164), then
adjust the cable (see page 11-163).
Install the cruise control cable (see page 4-44). then
adjust the cable (see page 4-45).
8.
(cont'd)
9-5

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

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.
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10-7

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
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O.RINGRADIATOR CAP
BADIATOB
LOWERCUSHION
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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
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Fuel and Emissions Systems
General Troubleshooting Information (cont'dl
How to Reset the ECM
You can reset the ECM in either of two ways:
. Use the OBD ll scantool or Honda PGMTesterto
reset the ECM memory.
See the OBD ll scan tool or Honda PGI\4 Tester user's
manuals for specific instructions.' Turn the ignition switch OFF, and remove the No. 6
ECU {ECM} (15A) fuse (A)from the under-hood fuse/
relav box (Blfor 10 seconds.
How to End a Troubleshooting Session
(required after any troubleshootingl
1. Reset the ECM as described above.
2. Do the ECM idle learn procedure (see page 11-139)
3. Turn the ignition switch OFF.
4. Disconnectthe OBD ll scan tool or Honda PGM
Tester from the DLC.
NOTE: The ECM is part of the immobilizer system.
lf vou replace the ECM, it will have a different
immobilizer code. In order for the engine to start,
you must rewrite the immobilizer code with the
Honda PGM Tester.
11-4
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How to Remove the ECM for Testing
1. Remove the passenger's dashboard lower cover
{see page 20-63), the passenger's kick panel (see
page 20-63), and the glove box (see page 20-63).
2. Remove the ECM mounting bolts (B) and the ECM
(c),
9.8 N.m{1.0 kgf.m,7.2lbt.ft}
3. Remove the ECM (B).
4. Installthe ECM in the reverse order of removal.
L

Fuel and Emissions Systems
System Descriptions
Electronic Control System
The functions of the fuel and emlssion control systems are managed by the engine control module (ECM).
Fail-safe Function
When an abnormality occurs in the signal from a sensor, the ECI\4 ignores that signal and assumes a pre-programmed
value for that sensor that allows the enqine to continue to run.
Back-up Function
When an abnormality occurs in the ECM, the injectors are controlled by a back-up circuit independent of the system to
permit minimal driving.
Self-diagnosis
When an abnormality occurs in the signal from a sensor, the ECM supplies ground for the malfunction indicator lamp
{MlL) and stores the diagnostic trouble code {DTC) in erasable memory. When the ignition is first turned on, the EClvl
supplies ground to the l\4lL for 15 to 20 seconds to check the M lL bulb condition.
Two Driving Cycle Detection Method
To prevent false indications, the "two driving cycle detection method" is used for some self-diagnostic functions.
When an abnormality occurs, the ECM stores it in its memory. When the same abnormality recurs afterthe ignition
switch is turned OFF and ON (ll) again, the ECM turns on the MlL.
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11-12
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