sensor HONDA CIVIC 2002 7.G Owners Manual

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

Intake Air System
Throttle Body Disassembly/Reassembly
EVAPORATIVE EMISSION {EVAP)CANISTER PURGE VALVE
A
V
2 N.m{0.2 kgt m, 1 lbf.ft)
3.5 N.m(0.35 kgf m.2.5lbf ft)
MAP SENSOR
THROTTLE BODY
L
TP SENSOR
11-166

Catalytic Converter System
DTC Troubleshooting
DTC P0420: Catalytic System Efficiency
Below Threshold
NOTE: lf some of the DTCS listed below are stored at
the same time as DTC P0420, troubleshoot those DTCS
first, then recheck for DTC P0420.
P0137, P0138: Secondary Heated Oxygen Sensor(secondary HO2S) (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1. Reset the ECM {see page 1'l-4}, then continue to
step 2 through 5 to reset the readiness code.
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) untilthe radiator fan comes on.
Drive for about l0 minutes without stopping. Your
speeo can vary.
With the transmission in 4th gear, drive at a steady
speed between 50 62 mph (80-'100 km/h) for
30 seconds.
Repeat step 4 three times. Between each repetition,
close the throttle completely for 1 2 seconds. lf
the engine is stopped during this part of the
procedure, repeat steps 3, 4 and 5.
Check for a Temporary DTC with the scan tool.
Does the scan tool indicate Temporaty DTC
P0420?
YES Check the TWC. lf necessary, replace the
TWC.I
NO Check for readiness code completion. lfthe
readiness is complete, it was a interminent failure,
and the system is OK at this time. lf the readiness
code is incomplete, repeat steps 2 through 5.1
4.
11-167

EVAP System
Component Location Index
EVAPORATIVE EMISSION {EVAP)CANISTER VENT SHUT VALVETroubleshooting,step 23 on page 1'l 178,step 1g on page l1- 182
EVAPORATIVE EMISSION IEVAPICANISTER PURGE VALVETroubleshooting,step 3 on page 'l1-175,
step 1on page 11-180
FUEL TANK VAPOR CONTROL VALVETest, page 11'187Replacement, page 11 189
FUEL TANK PRESSURE SENSORTroubleshooting, page 1 1-171
EVAPORATIVE EMISSION {EVAPICANISTERTroubleshooting, step 28 on page 11'183Replacement, page 1 1-189
EVAPORATIVE EMISSION {EVAP}BYPASS SOLENOID VALVETroubleshooting,step 12 on page '11'176,
step '10 on page 11 181
EVAPOBATIVE EMISSON {EVAP)TWO WAY VALVETest, page 'l1-'186
11-170

DTC Troubleshooting
DTC P0451: FTP Sensor Range/Performa nce
Problem
Special Tools Required
Vacuum Pump/Gauge, 0-30 in. Hg A973X-041-XXXXX
1. Remove the fuel fill cap.
2. Turn the ignition switch ON (ll)
3. l\4onitor fuel tank pressure (FTP) sensorvoltage
with the Honda PGM Tester, or medsure voltage
between ECM connectorterminals E4 and E14.
ECM CONNECTOR E 131P)
Wire side of female terminals
ls there about 2.5V?
YES-Go to step 4.
NO Replace the FTP sensor.I
Turn the ignition switch OFF.
Disconnect the hose between the EVAP two way
valve and the FTP sensor at the EVAP two way
valve end.
4.
5.
7.
8.
6. Connect a vacuum pump to the open end of the
hose.
Turn the ignition switch ON {ll).
l\4onitor FTP sensor voltage with the Honds PGM
Tester, or measure voltage between ECM
connector terminals E4 and E14, and carefully
squeeze the vacuum pump a little.
ECM CONNECTOR E 13lPI
Wire side of lemale terminals
The voltage should smoothly drop from about 2.5 V
to about 1.5 V. Stop applying vacuum when the
voltage drops to about 1.5 V or damage to the FTP
sensor may occur.
Does the voltage drop to about 1.5 V and hold?
YES Check for misrouted, leaking, or broken FTP
sensor vacuum lines. lf the vacuum lines are OK,
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 ECM.I
NO Replace the FTP sensor. !
9.
11-171

EVAP System
DTC Troubleshooting (cont'd)
DTC P0452: FTP Sensor Circuit Low Voltage
1. Check the vacuum lines at the FTP sensor for
misrouting, leakage. breakage, or clogging.
Are the vacuum lines OK?
YES Go to step 2.
NO Repair or replace vacuum lines as
necessary. I
2. Reset the ECM (see page 11-4).
3. Remove the fuelfill cap.
4. Turn the ignition switch ON (ll)
5. Monitor FTP sensor voltage with the Honda PGM
Tester, or measure voltage between body ground
and ECM connector terminal E14.
ECM CONNECTOR E 131PI
1 2t3t45o/89
././114tc61./182C21
22123241 t26271/ 2931
TP (LT GRN)
Wire side of female terminals
ls thete about 2.5 V?
YES- Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the FTP sensor and at the ECrM.l
NO Go to step 6.
11-172
6. Turn the ignition switch OFF.
7. Reinstallthe fuel fill cap.
8. Disconnect the FTP sensor 3P connector.
9. Turn the ignition switch ON (ll)
10. Measure voltage between FTP sensor 3P connector
terminals No. 1 and No.2.
FUEL TANK PRESSURE SENSOR 3P CONNECTOR
VCgl {YEL/BLU}
Wire side of female terminals
ls there about 5 V?
YES Go to step 1 '1.
NO-Repair open in the wire between the FTP
sensor and the ECM {E5).1

't2.
13.
14.
11. Measure voltage between FTP sensor 3P connector
terminals No. 2 and No.3.
FUELTANK PRESSUBE SENSOR 3P CONNECTOR
FTP (LT GBN)
Wire side of femaleterminals
ls there about 5 V?
YES - Replace the FTP sensor. t
NO-Go to step 12.
Turn the ignition switch OFF.
Disconnect ECM connector E (31P),
Check for continuity between FTP sensor 3P
connector terminal No. 3 and body ground.
FTP SENSOR 3P CONNECTOB
FTP (LT GRNI
Wire side of femalelerminats
ls there continuity?
YES Repair short in the wire between the FTP
sensor and the ECI\4 {E14).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/indicationgoes away with a known-good EClvl, replace the
original ECM.I
DTC P0453: FTP Sensor Circuit High Voltage
1. Check the vacuum lines at the FTP sensor for
misrouting, leakage, breakage, or clogging.
Are the vacuum lines OK?
YES-Go to step 2.
NO Repair or replace vacuum lines as
necessary.I
2. Reset the ECM {see page 11'4).
3. Remove the fuel fill cap.
4. Turn the ignition switch ON (ll).
5. lvlonitor FTP sensor voltage with the Honda PGM
Tester, or measure voltage between body ground
and ECM connector terminal E'14.
ECM CONNECTOR E 131PI
112134567I9
56/ t182C21
242il./29 3031
TP {LT GRN}
Wire side of female terminals
Is there about 2.5 V?
YES Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the FTP sensor and at the ECM.I
NO Go to step 6.
{cont'd)
11-173

EVAP System
DTC Troubleshooting (cont'dl
6. Turn the ignition switch OFF.
7. Reinstall lhe fuel fill cap.
8. Disconnect the FTP sensor 3P connector.
9. Turn the ignition switch ON (ll).
'10. l\4easure voltage between FTP sensor 3P connector
terminals No. 1 and No.2.
FTP SENSOR 3P CONNECTOR
VCC3 (YEL/BLU)
Wire side of female terminals
ls there about 5 V?
YES Go to step 11.
NO-Repair open in the wire between the FTP
sensor and the ECM (E4). !
11-174
11, Measure voltage between FTP sensor 3P connector
terminals No.2 and No.3.
FTP SENSOR 3P CONNECTOR
FTP ILT GRN}
Wire side of female terminals
ls there about 5 V?
YES Replace the FTP sensor.l
NO Go to step 12.
l\4easure voltage between ECM connector
terminals E4 and E 14,
ECM CONNECTOR E (31P)
Wire side of female terminals
ls there about 5 V?
YES Repair open in the wire between the FTP
sensor and the ECM (E14).I
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECN4. then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
\

EVAP System
DTC Troubleshooting (cont'dl
20. Plug the fueltank port (A) oftheEVAPtwoway
valve,
While monitoring FTP sensor voltage with the
Honda PGM Tester, or measuring the voltage
between ECM connector terminals E4 and E 14,
slowly pump the vacuum pump until the voitage
droDS to about 1.5 volts.
ECM CONNECTOR E {31PI
Wire side of female terminals
Does the voltage dtop to 1.5 V and hold fot at
Ieast 20 seconds?
YES-The EVAP bypass solenoid valve/EVAP two
way valve is OK. Go to step 22.
NO Repair the leak from the EVAP bypass
solenoid valve, EVAP two way valve. or
FTP sensor.l
11-178
Wire side of female terminals
EVAP Canister Vent Shut Valve Test
22. Disconnect the vacuum hose from the EVAP
canister vent filter (A), and connect a vacuum pump
to the hose.
Turn the ignitlon switch ON (ll).
Apply vacuum to the hose with five strokes of the
pump.
Does the valve hold vacuum?
YES Go to step 25.
NO The EVAP canister vent shut valve is OK. Go
to step 30.
Turn the ignition switch OFF.
Disconnect the EVAP canister vent shut valve 2P
conneclor.
Check for continuity between EVAP canister vent
shut valve 2P connector terminal No. 2 and body
ground.
EVAP CANISTEB VENT SHUTVALVE 2P CONNECTOR
{LT GRN/REOI
\
25.
26.
21.

28.
29.
ls thete continuity?
YES-Go to step 28.
NO-Replace the EVAP canister vent shut valve (A)
and o-ring (B).1
Disconnect ECM connector E (31P).
Check for continuity between EVAP canister vent
solenoid valve 2P connector terminal No. 2 and
body ground.
EVAP CANISTER VENT SHUTVALVE 2P CONNECTOR
Wire side o{ female terminals
ls there continuity?
YES-Repair short in the wire between the EVAP
canister vent shut valve and the ECM (E21).1
NO Update the ECM if it does not have the latest
soflware, 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
30.
Vacuum Hoses and Connections Test
Do the fuel tank vapor control valve test (see page
1 1-187).
ls the fuel tank vapot control valve OK?
YES-Go to step 31.
NO Replace the fueltank vapor control valve.l
Tighten the fuel cap 3 "clicks", then monitorthe
FTP sensor readings with the Honda PGM Tester.
Start the engine. and let it idle for 5 minutes.
Check the FTP sensor readings.
ls the reading above 0.5 kpa (4 mm Hg, 0.16 in.
Hg) pressure, or about 3 V?
YES 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 ECfvl, replace the
original ECM.t
NO Check the following parts for leaks:l
. Fueltank (A)
. Fuel fill cap (B)
. Fuel fill pipe (C)
. Fueltank vapor control valve(D). Fueltank vapor recirculation valve (E)
. Fueltank vapor recirculation tube (F)
. Fueltank vapor signaltube (G)
. Fueltank vapor control venttube(H). FTP sensor (J)
- Repair or replace any leaking parts.
5t.
11-179