2002 HONDA CIVIC ABS

PGM-FI System
aDTG Troubleshootang (cont'dl
DTC P0128: Cooling System Malfunction
NOTE; lf the DTCS listed below are stored at the same
time as DTC P0128. troubleshoot those DTCS first, thenrecheck for P0128.
P0107, P0108, P1128, P1129: N4anifold absolutepressure (MAP) sensor
P] I06, P1 107, P1 108: Barometric pressure (BARO)
sensor
P1259: VTEC system
P01 16, P01 17, P01 18: Engine coolant temperature (ECT)
sensor
P01 12, P01 13: Intake air temperature (lAT) sensor
P0500: Vehicle speed sensor {VSS)P0335, P0336: Crankshaft position (CKP) sensor
P0300: Random misfire
P0301, P0302, P0303, P0304: No. 1, No. 2, No.3 or No.4
cylinder misfire
P0505: ldle control system malfunction
P1519: ldle air control (lAC)valve
DTC P0128 can occasionally set when the hood is
opened while the engine is running.
1. Check the engine coolant level
Is the engine coolant level low?
VES Refill the engine coolant. lf necessary, repair
the coolant leakage.l
NO Go to step 2.
2. Turn the ignition switch ON (ll), and make sure the
A,/C is off.
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3. Check the radiator fan.
Does the tadiator fan keep running?
YES Checkthe rad iato r fan circuit (see page 10-
14), the radiator fan switch circuit (Short) (see page
10-'16), and the radiator fan switch (see page 10-17).
Also, inspect the ECT and IAT circuits and terminal
connections. lf the circuits, the switch, and the
connections are OK, update the ECI\4 if it does not
have the latest software. or substitute a known-good ECM, then recheck (see page 1 1-6). lf the
symptom/indication goes away with a known-good
ECM, replace the original ECM.I
NO Replace the thermostat (see page 10-8).1

PGM-FI System
DTC Troubleshooting (cont'dl
DTC P0171: Fuel System Too Lean
DTC P0172: Fuel System Too Rich
NOTE: lf some of the DTCS listed below are stored at
the same time as DfC PO17'l and/ot PO172,
troubleshoot those DTCS first, then recheck for P0171
andlot P0112.
P0107, P0108. P1 128. P1 129: Manifold absolute
pressure (MAP) sensor
P1 162. P1 166, P 1 167: 4,,/F sensor (Sensor 1 ) heater
P0137, P0138: Secondary HO2S (Sensor 2)
P014'l: Secondary HO2S (Sensor 2) heater
P1259: VTEC system
1. Check the fuel pressure (see page 11-'145).
ls luel pressure OK?
YES Go to step 2.
NO Check these items:
. lf the pressure is too high, replace the fuel
pressure regulator (see page 11-152).1. lf the pressure istoo low.checkthefuel pump,
the fuel feed pipe, the fuel filter, and replace the
fuel pressure regulator (see page 11-152).I
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
11-70
3. Turn the ignition switch OFF.
4. With a vacuum pump, apply vacuum to the
evaporative emission (EVAP) canister purge valve
(A) from the evaporative emission (EVAP) canister
side.
' A973AX-041-XXXXX
Does it hold vacuum?
YES-Check the engine valve clearances and adjust
if necessary, lf the valve clearances are OK, replace
the injectors (see page 1 1-1 1 1).1
NO-Replace the EVAP canister purge valve.l

DTC P0300: Random Misfire and Any Combination of the Following:
DTC P0301: No. 1 Cylinder Misfire
DTC P0302: No. 2 Cvlinder Misfire
DTC P0303: No, 3 Cvlinder Misfire
DTC P0304: No. 4 Cvlinder Misfire
NOTE:. lfthe misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles.
the MIL will come on, and DTC P0300 (and some comlrination of P0301 through P0304) will be stored.. lf the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and OTC
P0300 (and some combination of P0301 through P0304) will be stored. When the misfirlng stops, the MIL will remain
on.
1. Troubleshoot the following DTCs first if any of them were stored along with the random misfire DTC(s):
P0'107, P0108, P1128, P1129r N4anifold absolute pressure (MAP) sensor
P0111. P0'172t Fuel svstem
P0335. P0336: Crankshaft position (CKP) sensor
P0505: ldle control system
P1 149, Pl 162, P1 163, P1 164, P 1 165: Air fuel ratio (Ay'F) sensor
P1259: VTEC system
P1361, P1362: Camshaft position (CMP) sensor B {Top dead center (TDC) sensor)
P1519: ldle air control (lAC) valve
2. Test-drive the vehicle to verify the symptom.
3. Findthesymptom inthechart below, and dothe related procedures in the order listed until you find the cause.
SymptomProcedure(slAlso check foi:
Random misfire only
at low RPM and
under load
Check fuel pressure (see page 1 1-145).. Low compressron.. Low quality fuel.
Random misfire only
du ring acceleration
Check fuel pressure (see page 11-145).Malfunction in the
VTEC system (see page
1't-123).
Random misfire at
high RPM, under
load, or under
random conditions
Check fuel pressure (see page 11-145).Correct engine valve
clearances (see page 6-
91.
11-71

MIL Circuit Troubleshooting
1. Connect an OBD ll scan tool/Honda PGM Tester
(see page 11-3).
2. Turn the ignition switch ON (ll) and read the OBD ll
scan tool/Honda PGM Tester.
Does the OBD ll scan tool/Honda PGM Tester
communicate with the ECM?
YES Go to step 3.
NO Go to troubleshooting " DLC Circuit
Troubleshooting" (see page 11-109).
3. Check the OBD ll scan tool/Honda PGM Testerfor
DTCs.
Are any DTCs ind icated?
YES Go to the DTC Troubleshooting Index.
NO-Go to step 4.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (ll)and watch the
lMalfunction Indicator Lamp (MlL).
Does the MIL come on and stay on for more than
20 seconds aftet turning the ignition switch
oN (tr)?
YES lf the MIL always comes on and stays on, go
to step 76. But if the lMlL sometimes works
normally, first check for these problems.
. An intermittent short in the wire between the
ECIM (E29) and the data link connector (DLC).
. An intermittent short in the wire between the
ECM (E31) and the gauge assembly.
NO lf the MIL is always off, go to step 6. But if the
lvllL sometimes works normally, first check for
these problems.
. A loose No. 10 METER (7.5A) fuse in the under
dash fuse/relay box.. A loose No. 20 lG (40A) (Canada: 50A)Iuse in the
under-hood fuse/relay box.. A ioose No. 6 ECU (ECM) (15A) fuse in the under-
hood fuse/relay box.
. A loose No. 17 FUEL PUMP (15A)fuse in the
under-dash fuse/relay box.. A poor connection at ECM terminal E31.. An intermittent open in the GRN/ORN wire
between the ECM (E31) and the gauge assembly.. An intermittent short in the wire between the
ECM (A21) and the manifold absolute pressure
(MAP) sensor.. An intermittent short in the wire between the
ECI\4 (A20) and the throttle posilion (TPi sensor.. An intermittent short in the wire between the
ECM (E5) and the fuel tank pressure (FTP) sensor.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (ll).
ls the low oil pressure light on?
YES Go to step 10.
NO-Go to step 8.
8. Inspectthe No. 10 l\4ETER (7.5A)fuse inthe under-
dash fuse/relay box.
ls the luse OK?
YES Go to step L
NO Repair shon in the wire between No. 10
METER (7.5A)fuse and the gauge assembly. Also
replacethe No. 10 METER {7.5A) fuse.l
9. Inspect the No. 20 lG1 (40A) (Canada: 50A) fuse in
the under-hood fuse/relay box.
ls the f use OK?
YES Repair open in the wire between the No. 20
lG (40A) {Canadar 50A)fuse and the gauge
assembly. lf the wire is OK, test the ignition switch
{see page 22 53).
NO Repair short in the wire between No. 20 lG
(40A) lCanada: 50A)fuse and the under'dash fusel
relay box. Also replace the No.20 lG (40Ai
(Canada: 50A) fuse.I
(conr'd)
11-97

PGM-FI System
MIL Circuit Troubleshooting (cont'dl
51. Measure voltage between body ground and ECM
connector terminals 44, A5, 423, and 424
individuallv.
ECM CONNECTOR A 131P)
PG2 (BLK) PG1 IBLKI
Wire side of female terminals
ls there morc than 1.0 V ?
YES Go to step 52.
NO-Repair open in the wire(s) that had more than
1.0 V between G 10'l and the ECM (A4, A5, A23,
A24l.a
Measure voltage between body ground and ECM
connector terminal 421.
ECM CONNECTOR A 131P)
Wire side of female terminals
ls there about 5 V?
YES-Go to step 60.
NO-Go to step 53.
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53.
54.
Turn the ignition switch OFF.
Disconnect the manifold absolute pressure (MAP)
sensor 3P connector.
Turn the ignition switch ON (ll).
Measure voltage between body ground and ECM
connector terminal A21.
ECM CONNECTOR A {31P)
Wire side of female terminals
ls there about 5 V?
YES Replace the MAP sensor.l
NO Go to step 57.
Turn the ignition switch OFF.
Disconnect ECM connector A (31P).
55.
56.
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57.
58.

FuelSupply System
Fuel Pressure Relieving
Before disconnecting fuel lines or hoses, relieve
pressure from the system by disconnecting the fuel
tube/quick connect fitting in the engine compartment.
1. Turn the ignition switch OFF,
2. Remove the PGM-Fl main relay 2 (A).
Startthe engine, and let it idle until it is stalls.
NOTE: The DTCS or Temporary DTCS P0301. P0302,
P0303, P0304 may come on during this procedure.
lf any DTCS are stored, ignore them.
Turn the ignition switch OFF.
Remove the fuel fill cap, and relieve fuel pressure
in the fueltank.
Remove the engine cover.
Disconnect the negative cable from the battery.
Check the fuel quick-connect fitting for dirt, and
clean it if necessary.
3.
4.
6.
7.
8.
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11
10.
9. Place a rag or shop towel over the quick-connect
fitting (A).
Disconnect the quick-connect fifting (A): Hold the
connector (B) with one hand and squeeze the
retainer tabs (C) with the other hand to release
them from the locking pawls {D). Pullthe connector
off.
NOTE:. Prevent the remaining fuel in the fuel feedlineor
hose from flowing out with a rag or shop towel.. Be careful notto damage the line (E) or other
pa rts.. Do not use tools.. lf theconnectordoes not move, keepthe retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.. Do not remove the retainer from the line; once
removed, the retainer must be replaced with a
new one.
After disconnecting the quick-connect fifting, check
it for dirt or damage (see page 1 1-149).

2.
Fuel Line/Ouick-Gonnect Fittings Removal
1. Relieve fuel pressure (see page 1'l-144).
Check the fuel quick-connect fiftings for din, and
clean if necessary.
Hold the connector (A) with one hand and squeeze
the retainertabs (B)with the other hand to release
them from the locking paws (C). Pull the connector
off.
NOTE:. Be careful not to damage the line iD) or other
parts. Do not use tools.. lf the connectordoes not move, keep the retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.. Do not remove the retainer from the line; once
removed, the retainer must be replaced with a
new one.
4. C heck the contact a rea (A) of the line (B)for dirt and
da mage.
. lf the surface is dirty, clean it.. if the surface is rusty or damaged, replace the
fuel pump, fuelfilter, fuelfeed line.
=k
To prevent damaged and keep foreign matter out,
cover the disconnected connector and line end with
plastic bags (A).
NOTE:. The retainer cannot be reused once it has been
removed from the line.
Replaced the retainer when- replacing the fuel rail.- replacing the fuel feed Iine.
- replacing the fuel pumP.
- replacing the fuel filter.- replacing the fuel gauge sending unit
- it has been removed from the line.
- it is damaged.
11-149

Throttle Body Removal/lnstallation
NOTE:' Do not adjust the throttle stop screw.. Afterreassembly,adjustthethrottlecable{seepagell-163) and the cruise control cable (see page 4-45).. The throttle position (TP) sensor is not removable.
THROTTLELEVER
There should beno clearance
THROTTLE CABLE
MANIFOLDABSOLUTE PRESSURE{MAP} SENSOR
22Nm(2.2 kgt.m, 16 lbf.ft)
EVAPORATIVE EMISSION {EVAPICANISTER PURGE VALVE
IDLE AIR CONTROL{IACI VALVE
11-165