2003 HONDA CIVIC ecm

VTEC/VTC
DTC Troubleshooting (cont'dl
Remove the VTC strainer (A). Check the WC
strainer for clogging.
ls the strainet OK?
YES Go to step g.
NO-Clean the VTC strainer, then replace the
engine oil filter and the engine oil.l
9. Check the VTC oil control solenoidvalve {see page
11-127 ).
ls the VTC oilcontrol solenoid valve OK?
YES Go to step 10.
NO Clean the ports of the WC oil control solenoidvalve, or replace the VTC oil control solenoid valve
{see page 11-127).a
Installthe VTC oil control solenoid valve.
Start the engine. Hold the engine at 700 1,000 rpm.
12. Connect ECM connector terminal B23tobodvground with a jumper wire.
ECM CONNECTOR B {24PI
10.
11.
213 41567
8e l1a ,/1,/15
1181./l l./2123
vTc(BLK/WHT}JUMPERWIRE
11-120
Wire side of temale terminals
13. Connect ECM connector terminals A3 and 81 withajumper wire momentarily.
NOTE: Do not jump for more than 1 minute,
ECM CONNECTORS
Did the engine stall or run rough?
YES Test-drive at a steady speed between
20 40 mph (30 60 km/h) for 10 minutes.
lf temporary DTC P00'l 1 is indicated, update the
ECIVI 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 awaywith a known-good ECM, replace the original
ECM. !
NO Go to step 14.
Check the VTC actuator (see page 6,8).
ls the VTC actuatot OK?
YES Remove the auto-tensioner (see page 4-281,
and clean or replace the VTC oil strainer. Update
the ECI\4 if it does not have the latest software, orsubstitute a known-good ECM, then recheck (see
page 11-6). lf the symptom/indication goes awaywith a known-good ECM, replace the original ECM.
T
NO Replace the VTC actuator.t
\
14.
Wire side of female terminals

DTC P0340: CMP Sensor A No Signal
DTG P0344: CMP Sensor A Intermittent
Interruption
1. Reset the ECM (see page '11-4).
2. Start the engine.
ls DTC P0340 and/or P0344 indicated?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the CMP sensor A and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the CMP sensor A 3P connector.
5. Turn the ignition switch ON (ll).
6. Measure voltage between CMP sensor A 3P
connector terminal No. 3 and body ground.
CMP SENSOR A 3P CONNECTOR
(BLK/YEL}
Wire side of female terminals
ls there battety voltage?
YES Go to step 7.
NO Check the No. 4 ACG {10A) fuse in the under-
dash fuse/relay box. lf the fuse is OK, repair open in
the wire between the CN4P sensor A and No. 4 ACG
(10A) fuse.I
tG1
123
7. Measure voltage between CMP sensor A 3P
connector terminal No. 1 and body ground.
CMP SENSORA 3P CONNECTOR
Wire side olfemale termina s
ls therc about 5 V?
YES-Go to step 8.
NO-Go to step 10.
8. Measure voltage between CMP sensor A 3P
connector terminals No. 2 and No. 3.
CMP SENSOR A 3P CONNECTOF
;f-;-1 ,o, ,r.*,"r.,
I l1 J l-t
,-or---T--I{8RN/YEL) ni-
ls there battety voltage?
YES Go to step 9.
NO-Repair open in the wire between the Cl\4P
sensor A and G101.1
9. Substitute a known-good CMP sensor A and
recheck.
ls DTC P0340 and/ot P0344 indicated?
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 Replace the original CMP sensor A {see page
11-128).t
(cont'd)
11-121

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

DTC Pl519: IAC Valve Circuit Malf unction
1. Resetthe ECM (see page 11-4).
2. Turn the ignition switch ON (ll)
ls DTC P 1519 indicated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the IAC valve and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the IAC valve 3P connector.
5. Turn the ignition switch ON (ll).
6. Measure voltage betlveen IAC valve 3P connector
terminal No. 2 and body ground.
IAC VALVE 3P CONNECTOR
IGP {YEL/BLK)
Wire side of female terminals
ls there battery voltage?
YES Go to step 7.
NO-Repair open in the wire between the IAC valve
and the PGM-Fl main relay 1.1
Turn the ignition switch OFF.
123
7.
8, Check for continuity between body ground and IAC
valve 3P connector terminal No. 1.
IAC VALVE 3P CONNECTOR
123
PG1 {BLK}
a.
Wire side of lemale terminals
Is there continuity?
YES-Go to step 9.
NO Repair open in the wire between the IAC valve
and G'101.1
Disconnect ECM connector A (31P)
Check for continuity between body ground and
ECM connector terminal A12.
ECM CONNECTOR A 131P)
r l2l3l4 5617s
r01l12 .// 1156 ./118192C21
da25126l27ln2930
IACV {BLK/RED}
1,)
Wire side oJ Jemale terminals
ls there continuity?
YES-Repair short in the wire between the IAC
valve and the ECM (A12).1
NO Go to step 1 1.
9.
10.
LCOnI Ol
11-131