2003 HONDA CIVIC Workshop Manual

VTEC/VTC
10.
DTC Troubleshooting (cont'd)
Measure voltage between ECM connector terminal
A25 and body ground.
ECM CONNECTOR A 131P)
Wire side of female te.minals
ls there about 5 V?
YES-Repair open in the wire between the ECM(A25) and CMP sensor A.I
NO-Go to step 11.
Turn the ignition switch OFF.
Disconnect ECM connector A (31P)
Check for continuity between ECM connecror
terminal A25 and body ground.
ECM CONNECTON A 131P}
Wire side of femaleterminals
ls tnere continuity?
YES-Repair short in the wire between the ECM(A25) and the CMP sensor A. t
NO Update the ECt\4 if it does not have the latest
software, or substitute a known-good ECM, thenrecheck (see page 1 1-6). lf the symptom/indicationgoes away with a known-good ECM, replace the
original ECM.I
11.
't2.
11-122
DTC P0341: WC Phase Gap
1. Resetthe ECM {see page 11-4).
2. Start the engine.
ls DTC P0341 indicated?
YES Go to step 3.
NO Intermittent failure, system is OK at this time.Check for poor connections or loose terminals atthe CMP sensor A and at the ECM.I
3. Check the VTC oil control solenoid valve (see page
11_127]-.
Isthe VTC oil control solenoid valve OK?
YES-Go to step 4.
NO-CIean the VTC oil control solenoid valve, orreplace it (see page 11-'l27l.a
4. Remove the head cover, and check the cam chain
{see page 6-12).
ls the cam chain OK?
YES Go to slep 5.
NO Replace the cam chain (see page 6-12).1
5. Check the VTC actuator (see page 6-8).
ls the VTC actuator OK?
YES- U pdate the ECM if it does not have the tatest
soflware, or substitute a known-good ECI\4, thenrecheck (see page 11-6). lf the symptom/indicationgoes away with a known-good ECM, replace the
original ECM.I
NO- Replace the VTC actuator.l

DTC Pl259: WEC System Malf unction
SpecialTools Required. Pressure gauge adapter 07NAJ P07010A
. A/T low pressure gauge w/panel 07406-0070300. A/T pressure hose 07406-0020201. Av/T pressure hose,2,210 mm 07IMAJ-PY4o11A
. l"/T pressure adapter 07MAJ-PY40120
. Oil pressure hose 07ZAJ-S54,4200
1. Reset the ECM (see page 11-4).
2. Check the engine oil level, and refill ifnecessary.
3. Start the engine. Hold the engine at 3,000 rpm with
no load {in neutral) until the radiator fan comes on.
4. Road testthe vehicle:
Accelerate in the 1st gear to an engine speed over
4.000 rpm. Hold the speed for at least 2 seconds. lf
DTC P1259 is not repeated during the first road test,
repeat the test two more times.
ls DTC P1259 indicated?
YES Go to step 5.
NO-lntermittent failure, system is OK at this time
Check the oil consumption if oil was added in step
2. Check for poor connections or loose terminals at
the VTEC solenoid valve, the VTEC oil pressure
switch, and at the ECI\4. I
5, Turn the ignitjon switch OFF.
6. Disconnect the VTEC oil pressureswitch 2P
connector.
7. Check for continuity between VTEC oil pressure
switch 2P connector terminals No. 1 and No. 2
VTEC OIL PRESSURE SWITCH2P CONNECTOR
Terminal side of male terminals
Is there continuity?
YES-Go to step 8.
NO Replace the VTEC oil pressure switch.l
8. Turn the ignition switch ON (ll).
9. Measure voltage between VTEC oil pressure switch
2P connector terminal No. 1 and body ground
ls there battety voltage?
YES Go to steP 14.
NO-Go to step 10.
(cont'd)
VTEC OIL PRESSURE SWITCH2P CONNECTOR
VTPSW
/T {BLU/BLK}
{.--r r-l'--.l
J II
oI
Wire side of female terminals
11-123

VTEC/VTC
DTC Troubleshooting (cont'd)
10. Measure voltage between ECM connectorterminal
89 and body ground.
ECM CONNECTOR B (24P)
213 415o1
8Iat/t/n315
WPSW {BLU/BLK}
Wire side of Iemale terminals
ls there battery voltage?
YES Repair open in the wire between the VTEC oilpressure switch and the ECM (89).t
NO-Go to step 11.
Turn the ignition switch OFF.
Disconnect ECM connector B {24P).
Check for continuity between ECM connector
terminal Bg and body ground.
ECM CONNECTOR B {24P)
2 3 41567
I9ol./ ./ 1315
VTPSW {BLU/BLK}
Wrre side of female terminals
ls there continuity?
YES Repair short in the wire between the VTEC oilpressure switch and the ECM (89).I
NO Update the ECM 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 ECN4. !
11.
11-124
2P CONNECTOR
VTPSW(BLU/BLK)
14. fMeasure voltage between VTEC oil pressure switch
2P connector terminals No. 1 and No. 2,
VTEC OIL PRESSURE SWITCH
(BRN/YELI
Wire side of Iemale terminals
ls there battery voltage?
YES-Go to step 15.
NO Repair open in the wire between the VTEC oil
pressure switch and G 101.1
Turn the ignition switch OFF.
Disconnect the VTEC solenoid valve 2P connector.
Check for resistance between VTEC solenoid valve
2P connector terminals No, 1 and No. 2.
VTEC SOLENOID VALVE2P CONNECTOR
Terminal side of male terminals
ls there 14- 30 Sl ?
YES Go to step 18.
NO Replace the VTEC solenoid valve (see page
11-128).t
to.
17.

18.Remove the VTEC oil pressure switch (A) and
installthe specialtools as shown, then reinstall the
VTEC oil pressure switch.
07406-0070300
\lsl
t:={
R
07406-0020201 ot07MAJ-PY,lo11A and07MAJ-PY40120
A22 N.ml2.2kgt.m,16 rbf.ft)
19.
20.
21.
22.
07NAJ-P07010A
Reconnect the VTEC solenoid valve 2P connector
and VTEC oil pressure switch 2P connector.
Connect a tachometer or OBD ll scan tool/Honda
PGM Tester to the DLC.
Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
Checkthe oil pressure at engine speeds of 1,000
and 2.000 rpm. Keep the measuring time as shon
as possible {less than 1 minute) because the engine
is running with no load.
ls the oil ptessure below 49 kPa (0.5 kgf/cnf,
7 psi)?
YES Go to step 23.
NO Inspect the VTEC solenoid valve (see page 11-'t28l.a
23.
24.
25.
26.
Turn the ignition switch OFF.
Disconnect the VTEC solenoid valve 2P connector.
Aftach the battery positive terminalto VTEC
solenoid valve 2P connector terminal No. 2.
Start the engine, then connect the battery negative
terminalto VTEC solenoid valve 2P connector
terminal No. 1, and check the oil pressure at an
engine speed of 3,000 rpm.
ls the oil pressure above 390 kPa (4.0 kgt/crtf ,
57 psi)?
YES Go to step 27.
NO Inspectthe VTEC solenoid valve (see page I1-
12Al.a
27. With the battery terminals still connectedtothe
VTEC solenoid valve connector, measure voltage
between ECM connector terminal 89 and bodv
oround.
ECM CONNECTOR B {24P)
ls there battery voltage above 4,000 tpm?
YES Go to step 28.
NO-Replace the VTEC oil pressure switch (see
page 11'128).1
Turn the ignition switch OFF.
Disconnect the battery terminals from the VTEC
solenoid valve terminal connector.
(cont'd)
28.
29.
Wire side of female terminals
11-125

WEC/VTC
30.
DTC Troubleshooting (cont'd)
Disconnect ECM connector B (24P)
Check for continuity between ECM connector
terminal 815 and body ground.
ECM CONNECTOR B {24P)
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the VTEC
solenoid valve and the ECM (815).1
NO Go to step 32.
11-126
32. Connect VTEC solenoid valve 2P connector
terminal No. 2 to body ground with a jumper wire.
VTEC SOLENOID VALVL2P CONNECTOR
r-.'-r.---.1
t1t2l
+JUMPER I VtSWIRE I IGRN/YEL)
I
Wire side of female terminals
Check for continuity between ECM connector
terminal 815 and body ground.
ECM CONNECTOR B {24PI
Wire side of female terminals
ls thete continuity?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Repair open in the wire between the VTEC
solenoid valve and the ECM (815).I

WC OilControl Solenoid Valve Removal/Test
1. Remove the WC oilcontrol solenoid valve (A).
NOTE: lnstall the valve in the reverse order of
removal with a new o-ring (B), then check these
tlems:
Clean and dry the VTC oil control solenoid valve
mating surface.
Coat the O-ring with engine oil.
Do not install the VTC oilcontrol solenoid valve
while wearing fibrous gloves,
Be careful not to contaminate the cylinder head
openrng.
Check the VTC oil control solenoid valve filter for
clogging. lf it is clogged, replace the VTC oil control
solenoid valve.
Check the clearance between the port (advance
side) and the valve. The clearance (A) should be at
least 2.8 mm (1/8 in.).
Connect the battery positive terminal to VTC oil
control solenoid valve 2P connector terminal No. 2.
VTC OIL CONTROL SOLENOIDVALVE 2P CONNECTOR
Terminal side oJmale terminals
Connect the battery negative terminal to VTC oil
control solenoid valve 2P connector terminal No. 1,
then make sure the valve (A) opens fully.
BATTERY
11-127

VTEC/WC
1.
CMP Sensor A Replacement
Remove the air cleaner (see page 1 1-162).
Disconnect the CMP sensor A 3P connector.
Remove the CMP sensor A (A).
Installthe sensor in the reverse order of removal
with a new o-ring (B).
B-'-----'-l:,",14*
11-128
WEC Solenoid Valve Removal/
Inspection
1.Disconnect the VTEC solenoid valve 2P connector.
Measure resistance between VTEC solenoid valve
connector terminals No. 1 and No. 2.
Resistance: 14-30 Q
3. lf the resistance is within specifications, remove the
VTEC solenoid valve assemblv (A)from the
cylinder head, and check the VTEC solenoid valve
filter (B)for clogging. lf it is clogged, replace the
solenoid valve filter, the engine oilfilter, and the
engine oil.
6x1.0mm9.8 N.m (1.0 kgf.m, 7,2 lbf.ftl
L

ldle Gontrol System
Component Location Index
TE'
IDLE AIR CONTROL {IAC) VALVETroubleshooting, page 1 1-'131
11-129