2003 HONDA CIVIC Harness

Engine Assembly
Engine Removal (cont'dl
14. Remove the clutch slave cylinder {A) andclutchline
bracket mounting bolt (B).
15. Remove the shift cable (A) and select cable (B).
5-4
..4,
16. Disconnect the engine control module (ECM)
connectors (A) and main wire harness connector(B).
Remove the harness clamps (A) and grommet (B),
then pullthe engine wire harness through the
bulkhead.
't7 .
\l,

27. lnstallthe upper radiator hose {A) and heater hoses(B).
Push the engine control module (ECM) connectors
through the bulkhead, then installthe grommet (A).
29. Installthe harness clamps (B).
30. Connect the ECI\4 connectors (A) and main wire
harness connector (B).
Install the throttle cable (see page 11-164), then
adjustthe cable {see page 11-'163).
Installthe cruise control cable (see page 4-44), then
adjust the cable (see page 4-45),
Install the brake booster vacuum hose (A) and the
evaporative emission (EVAP) canister hose (B).
34. Installthe fuel line (see page 11-150).
31.
32.
33.
(cont'd)
5-13

Engine Assembly
Engine Installation {cont'dl
Install the select cable (A) and shift cable (B) using
the plastic washers (C), washers (D), and new cotter
pins (E).
6x1.0mm9.8 N.m (1.0 kgf.m,7.2 tbl.ftl
Install the clutch slave cylinder (A) and clutch line
bracket mounting bolt (B).
6x1.0mm9.8 N.m{1.0 kgf.m,7.2 tbt.ft)
"-.----->)
"------'6
8 x '1.25 mm24 N.m (2.4 kgl.m,
5-14
37. Installthe battery cables (A) on the under-hood
fuse/relay box, then install the harness clamp (B).
Installthe ground cable (C).
Installthe intake air duct.
6x1.0mm12Nm{1.2kgf.m,8.7 tbf.ft)
39.
\"
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a
6x1.0mm12Nm{1.2kgt.m,8.7 rbf.ft)

Gylinder Head Removal
NOTE:. Use fender covers to avoid damaging painted
surfaces.
To avoid damage, unplug the wiring connectors
carefully whlle holding the connector portion.
To avoid damaging the cylinder head, wait until the
engine coolant temperature drops below 100'F (38"C)
betore loosening the cylinder head bolts.
Mark all wiring and hoses to avoid misconnection.
Also, be sure that they do not contact other wiring or
hoses, or interfere with other parts.
'1.
2.
3.
Drain the engine coolant (see page 10-6).
Remove the drive belt (see page 4-26).
Remove the intake manifold {see page 9-3).
Remove the air cleaner housing (see step 7 on page
5-2t.
5. Remove the water bypass hose (A).
Remove the exhaust manifold (see page 9-7
Remove the cam chain (see page 6-12).
6.
7.
).
8. Remove the engine wire harness connectors and
wire harness clamps from the cylinder head.
. Engine coolant temperature (ECT) sensor
conneclor. Camshaft position (Cl\4P) (top dead center (TDC))
sensor B connector. Camshaft posilion (CMP) sensor A connector
9. Remove the upper radiator hose (A) and heater
hose (B).
'10. Remove the harness holder (A)from the bracket,
then remove the connecting pipe mounting boh {B)
and brake booster vacuum line mounting bolts {C).
(cont'd)
1 1. Remove the water bvpass hose (D).
6-23

Cylinder Head
8.
Cylinder Head lnstallation (cont'd)
7.Apply engine oil to the bolt threads and under thebolt heads of all the cylinder head bolts.
Tighten the cylinder head bolts in sequence to 39N.m {4.0 kgf.m, 29 lbf.ft). Use a beam-type torquewrench. When using a preset-type torque wrench,be sure to tighten slowly and do not overtighten. lf
a bolt makes any noise while you are torquing it,
loosen the bolt and retighten it from the first step.
9.After torquing, tighten all cylinder head bolts in twosteps (90" per step). lf you are using a new cylinderhead bolt, tighten the bolt an extra 90..
FIRST STEP
SECOND STEP
6-40
v
{\
10. Installthe rocker arm assembly {see page 6-38).
1't .Install the water bypass hose (A).
---l.-.
B6x1.0mm'r2 N.m(1.2 kgl.m,8.7 lbf.ftl
12.
't3.
c6xl.0mm'12 N,m (1.2 kgt.m,8.7 lbf.ft)
Tighten the connecting pipe mounting bolt (B) andbrake booster vacuum line mounting bolts (C), theninstallthe harness holder (D) on the bracket.
Installthe upper radiator hose {A) and heater hose(B).

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
\-
(
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)
*&
\
2.
?
w
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

Fuel and Emissions Systems
Symptom Troubleshooting Index
When the vehicle has one of these symptoms, check the diagnostic trouble code (DTC) with the scan tool. lf there is no
DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.
SvmotomDiaqnostic procedureAlso check lor
Engine will not sta rt
(MlL works OK, no DTCS set)
1. Test the battery {see page 22-50).
2. Test the starter (see page 4-8).
3. Troubleshoot the fuel pump circult (see page 11
141).
Low compressron
No ignition spark
lntake air leaks
Locked up engine
Broken timing chain
Contaminated fuel
Engine will not start (MlL
comes on and stays on, or
never comes on at all, no
DTCS set)
Troubleshoot the l\4lL circuit (see page 1 '1-97).
Engine will not start
(immobilizer indicator stays
on or flashs)
Troubleshoot the immobilizer system (see page 22-165).
Hard starting(MlL works OK, no DTCS set)
1. Testthe battery (see page 22-50).
2. Checkthe fuel pressure (see page 11-145).
Low compression
Intake air leaks
Contaminated fuel
Cold fast idle too low(MlL works OK. no DTCS set)
1. Do the ECM idle learn procedure (see page 11-139).
2. Checkthe idle sDeed (see paqe 11-138).
Cold fast idle too high
(MlL works OK, no DTCS set)
Do the ECI\4 idle learn procedure (see page 1 1- 139).
Checkthe idle speed {see page 11-138).
Inspect/adjust the throttle cable (see page 1 '1-'163).
Inspect and test the throttle body {see page 1 1-160}.
']
2.
3.
ldle speed fluctuates
(MlL works OK, no DTCS set)
1. Dothe ECM idle learn procedure (see page 11-'139).
2. Check the idle speed (see page 11-138).
3, Inspecvadjust th e throttle cable (see page 11''163).
4. Insoect and test the throttle bodv (see paqe 11- 160)
Intake air leaks
After warming up, idle speed
is below specifications with
no load
{MlL works OK, no DTCS set)
1. Do the ECIVI idle learn procedure (see page 1 1- 139).
2. Troubleshootthe alternator FR signal circuit (see
page 11-'134).
3. InsDect and test the throttle bodv {see paqe 1 1-160).
Vacuum hose clogged/
cracked/poor
connectron
After warming up, idle speed
is above specifications with
no toao(MlL works OK. no DTCS set)
1. Do the ECM idle learn procedure {see page 1'j-139).
2. Troubleshoot the alternator FR signal circuit(see
page 11-134).
Low power
(MlL works OK, no DTCS set)
1. Check the fuel pressure(seepagell-145).
2. Inspect and test the th roftle body (see page 11-160).
3. Inspecvadjust the throttle cable (see page 11-'163).
Low compressron
Camshaft timing
problem
Engine oil levelprootem
Engine stalls(MlL works OK. no DTCS set)
1. Do the ECM idle learn procedure (see page 1'l'139).
2. Check the fuel pressure{seepagell-145).
3. Check the idle speed (see page I 1-138).
4. Troubleshootthe brake pedal position switch signal
circuit (see paqe 11-137).
lntake air leaks
Faulty harness and
sensor connections
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11-10
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