1997 HONDA CIVIC Control Module AT

VTEC Control System
Troubleshooting Flowchart
tFtrsrl #ilH:::lj1t:"J:T,?ffnostic
rrouble code (Drc) Pr25e: A probrem in the vrEc Pressure switch circuit or
Reter to page 1 l-38 th roug h 1 1-55 before trou bleshooting.
* Road Test:Accelerate in 1st gear to an engine speed over 3,000 rpm(D16Y5 engine) or 6,000 rpm (D'16Y8 engine).Hold that engine speed for at least two seconds.It DTC P1259 is not repeated during the first road test, repeatthis test two more tames.
VTEC PRESSURE SWITCH 2PCONNECTOR
Terminal side ofmale terminals
Wire sid6 ol femalerermtnats
VTM
l1 (BLu/BLK)
f;-) |I
I
Y
I
The MIL has been reoorted on.DTC P1259 is sto.ed.
Check the VTEC Cont.ol Syst6m:1. Do the engine control module(ECM)/powertrain control module lPCM) Reset Procedure (see
section 11).2. Stan the engine.3. Warm up the engine to normaloperating temperature (cool-
ing fan comes on).4. Do the Boad Test.*Intermittont tailura, 3y3t.m is OKat thia time.Check for ooor connoctionr o.loose wirea at VTEC oiassurclwitch, VTEC solonoid valvo .ndECM/PCM,
ls OTC P1259 indicated?
Test rhe VTEC Prensure Switch:1. Turn the ignition switch OFF.2. Disconnect the VTEC Pressureswitch 2P connector.3. Check for continuity betweenVTEC pressure switch 2P con-nector terminal No. 1 and No.2.
Replace the VTEC preasure 3witch.ls there continuity?
Te3t the VTEC Pressure SwitchWire:1. Turn the ignition switch ON lll).2. Measure the voltage betweenVTEC press u re switch 2Pconnector No. l and bodyground.
In3poct for en opon or shod toground in thG wi.. bctwoon thoVTEC pro$ur6 switch rnd ECM/PCM l'96 - 9a: C15,'99 - 00: C101.lf tha wiro i3 OK,3ubrtitute aknown-good ECM/PCM andrecheck.
ls there battery voltage?
{To page 6'4i

VTEC Control SYstem
The scan tool indicates Diagnostic Trouble Code {DTC) Pl259:
VTEC Solenoid Valve circuit
Refer to page 1'l-38 through 11 55 before troubleshooting
Troubleshooting Flowchart
YES
A problem in the WEC Pressure Switch circuit or
* Road Test:Accelerate in 1st gear to an engine speed over 6,000 rp '
Hold that engine speed for at leasttwo seconos'
lf the DTC P1259 is not repeated during the first road test'
repeat this test two more times
VTEC PRESSURE SWITCH 2P
CONNECTOR
Terminalside ofmale termtnals
WM
/1 IBLU/BLKI
/ 1 Y------rt--------- l I
\1-/ |I
I
I1
Wire side of femaleterminals
(cont'd)
6-51
The MIL has been teported on.
DTC P1259 is siored.
Check the VTEC Control SYsiem:
1. Do the engine control module(ECM ) Reset Procedure (see
section 11).
2. Start the engine
3. Warm uP the engine to normal
operating temPerature (cool
ing fan comes on).
4. Do the Road Test.*lntermittent failure, sYstem is OK
at this time.Check for Poor connectlons or
loose wires at VTEC Pressureswilch. VTEC aolenoid valvo and
ECM.
ls DTC P1259 indicated?
Test the VTEC Pressure Switch:
1. Turn the ignition switch OFF.
2. Disconnect the VTEC Pressure
switch 2P connector.
3. Check for continuity between
VTEC pressure switch 2P con
nector telminal No 1 and
No.2.
Reolace the VTEC Pre3sure switch.
Test the VTEC Pressure Switch
Wire:1. Turn the ignition switch ON (ll).
2. N4easure the voltage between
VTEC press u re switch 2P
connector No. 1 and bodyground,
Inspect lor an open or short toground in the wire between the
VTEC orassure swilch and ECM
{c101.lf the wire i3 OK, substitute a
known-good ECM and recheck.
{To page 6 52)

!
Fuel and Emrsslons
SoecialToofs .....,...."..,. 11-2
Component Locations
lndex ....................., ......... 11-3
Svstem Description
Vacuum Connections ................,,..,.. ......... 11-12
Electrical Connections ...............,.,.,... ....... 11-29
System Connectors ........,.,.,.......................... 1 1-51
Troubleshooting
Troubleshooting Procedures ................. .. 11-81
Engine Control Module/PowertrainControl Module TerminalAfiangement ....,.,..... 11-88
Diagnostic Trouble Code Chart .................,., 11.97
How to Read Flowcharts .,.......................... . 11-103
PGM-Fl System
System Description ...... 11-10,1
Troubleshooting Flowcharts
Engine Control Module/PowertrainContlol Module ........ 11-107
Manitold Absolute Pressure Sensor .....'. . ... 11-115
fntake Air Temperatuie Sensor ..... . . ., . 11'121
Engine Coolant Temperatuae Sensol ........., 11-128
Throttle Position Sensor ...................,........... 11-132
Primary Heated Orygen Sensor (Sensor 1l ... 11-139
Secondary Heated Oxygen Sensor(Sensor 21.................................................... 1 1-153
Heated Oxygen Sensor Heater ...................,. 11-157
Fuel Supply System ...... 11-164
Random Mislire ......., ..11-166
Misfire Detected in One Cylindsr ................. 11-167
Knock Sensor .,.,............ 11-170
CKP/TDC/CYP Sensor ................................... 11'172
Vehicle Speed Sensor ...........,......,...,.,........... 1t-176
Barometric Pressure Sensor ...............,......... I 1-178
Electrical Load Detector,.,,............................ 1 1-179
CKF Sensor .................... 11-183
ECM/PCM Internal Circuit ............................. I 1-188
A/T Signal {TMA/TMBI .................................. I 1-189
ldle Control System
System Doscriplion ............ 11-190
Troubleshooting Flowcharts
ldle Control System ...... 11-192
ldle Air Control Va1ve .................................... I 1-19i1
Starter Switch Signal .................................... 1 1'202
Air Conditioning Signal ................................. 11'201
Ahernator FR Signal .................................... . 1 1-208
BrakeSwitch Signal ..................................... f 1"210
Power Sleering Prossure Switch Signal ......11-212
A/T Gear Position Signal ............................... 11-216
Clutch Swiich Signal ................................-.... 11-214
ldte Speed Setting . .............11-220
Fuel Supply System
Fuel Lines .,...................,.,.,.,11-221
Fuef Tube/Ouick-Connect Fittings ..........,.,........ 11 -227
System Description ....'.... 11-230
Fuel Pressure .......,.,,........... 11-230
Fuef fniectors ......................11-232
Fu€f Pressure Regulator .....,.......................'...,. 11-231
Fuef Fifter ............................11-235
Fuel Pump .............'.......'.... 11-236
PGM-FI Main Relay .............11'237
Fuel Tank ................ ....,...'.'.' 11'211
Intake Air System
System Description ....-.-.....11-243
Air Cfeaner ...........,......."". .11-211
Throttle Cable .....................11-211
Throttfe Body ........ ..'... . . .,.11-211
Fuel Iniestion Air Control System ,.,.,....-........... 11-250
Emission Control System
System Description .-..........11-252
Taifpip€ Emission ...............11-252
Three Way Catafytic Convert€r ............,.,,.,.,.,.... 11 -252
Exhaust Gas Racirculaiion System ...,.,,,,.,.,.,.,,. 11'254
Positive Crankcas€ Ventilation System .... . . .. 11-266
Evaoorative Emission Controls ..................,,..,.,. 11 -267

I
CLUTCH SWITCH lDl6Y5 onginoM,/TITroubleshooting, page 1 1-218
'96 - 98 modsls:
Sell-diagnostic Procedures.page 11 81
ENGINC CONTROL MOOUI.T(FCMI/POWERTRATN
CONTROL MODULE IPCMITroubleshooting, page 1 1-107
'9!, - 0o modol3:
PGM.FI MAIN RELAYRslay Testing, page 11-237Troubleshooting, page 1 1-238PGM.FI MAIN RELAYRelay Testing, page l1 237Troubleshooting, pago 1'! 238
SERVICEl2Pl
CONNECTOR
ENGINE CONTROL MODU1T(ECM}/POWERTRAIN
CONTROL MODULE IPCMITroubleshooting, page 11 111SERVICE CHECK CONNECTORtzPlSelf-diagnostic Procedures,page 11-81
Self-diagnostic Procedures,page 11-81
{cont'd)
11-7

Troubleshooting
Troubleshooting Procedures
How To Begin Troubleshooting
When the Malfunction Indicator Lamp (MlL) has been reported on, or there is a driveability problem, use the appropr'-
ate orocedure below to diagnose and repair the problem'
A. When the MIL has come on:
,1. connect the Honda PGM Tester or an oBD ll scan tool to the 16P Data Link connector (DLC) located near the left
kick panel.
2. Turn the ignition switch ON (ll)
3. Check the DTC and note it. Also check and note
the freeze trame data
Refer to the Diagnostic Trouble Code Chart and
begin troubleshooting.
NOTE:
.SeetheoBD||scantoolorHondaPGMTesteruser,smanua|sforspecificoperatinginstructions..
.Thescantoo|oltestercanreadtheDiagnosticTroub|ecodes(DTc},freezeframedata,currentdata,andother
Engine Control Module (ECM)/Powertrain Control Module (PCM) data'
oFreezeframedataindicatestheengineconditionswhenthefirstma|function,misfireorfue|trimma|function
was detected. lt can be useful information when troubleshooting'
B. When the MIL has not come on , out there is a d riveability problem, refer to the Symptom Chart on page 1 1-84'
c.DTcswi|lbeindicatedbytheb|inkingoftheMa|function|ndicatorLamp(M|L)withthescsserviceconnectorcon.
nected.
Connect the SCS service connector to Service Check Connector as shown (The 2P Service Check Connector is
|ocatedunderthedashonthepassenger,ssideofthevehic|e')TurntheignitionswitchoN{||)'
OBO ll SCAN TOOL olHONOA PGM TESTER
SERVICE CHECKCONNECTOR I2P)
scs sERvlcE(cont'd)
MALFUNCTIONINDICATORLAMP
DATA LINK CONNECTOR Il6PI
07PAZ - (x)l0100
11-81

Troubleshooting
Troubleshooting Procedures (cont,dl
ll, Engine Control Module (ECM)/powertrain Control Module (pCM) Reset procedure
NoTE: Resetting the EcM/PcM will erase any stored DTcs and any freeze data. lt will also restart all readiness codemonitors.
Either of the following actions will reset the ECM/PCM.
. Use the OBD ll scan tool or Honda pGM Tester to clear the EClM,s/pCM,s memory.
NorE: see the oBD ll scan tool or Honda PGM Tester user's manuals for specific operating instructions.
' Turn the ignition switch oFF. Remove the BACK uP (7.5 A) fuse from the under-hood fuse/relay box for 10 sec-onds.
NorE: Bemoving the BACK uP (7 5 A) fuse cancels the clock and the radio presets. Make note of the customer,spresets so you can reset then
lll. Final Procedure (this procedure must be done after any troubleshoottng)
1. Remove the SCS Service Connector if it is connected.
NoTE: If the Scs service connector is connected and there are no DTcs stored in the EcMipcM, the MtL will stayon when the ignition switch is turned ON 0l).
2. Do the ECM/PCM Reset procedure.
3. Turn the ignition switch OFF.
1-82

Probable Cause List lFor th€ DTC Chart, see page 11-971*: '99 - 00 models
Probable GausePageSystem
11 1-107Engine Control Module (ECM)/Powertrain Control Module (l'uM)
PGM-Fl main relay
l^^iti^n cwetam
211-230,231
3't't-237
Section 23
51'1-172,183Crankshaft Position/fop Dead Center/Cylinder Fosltlon sensor clrculr' Lr\F selrsor
circuit
Intake Air Temperature (lAT) sensor circuit
ldle Air Control (lAC) Valve
ldle speed adjustment
Throttle bodY
Throftle cable
Manifold Absolute Pressure (MAP) sensor
Throftle Position (TP) sensor
Barometric pressure (BARO) senso'
Mf g"a, po"ition signal (see page 11-216) or clutch switch signal
Brake switch signal
Air Cleaner
lntake air pipe
Three Way Catalytic Converter (TWC)
Evaporative emission (EVAP) control
Contaminated fuel
ORVR vent shut valvs
't1-124
71 1-194
I11-220 - 223
11-241
'1011-244
1111-115
1211-132
13't1-178
14Section 14. 11-218
1511-210
16't1-244
1811-252
1911-261
20
21*11-296
(cont'd)
11-85

Troubleshooting
E n gine/P_o,weft ra in Control Module Term inal Arra n gement('96 - 98 Models, '99 - 00 Dl6yS engine with M/T)
-
ECM/PCM CONNECTOR A I32PI
1INJ62INJ3INJ21
INJl567I
LG110PGll1
IGPl12
ACV
131115
PCS
16
FLR17acc18MIL19ALTC20
tcM22PG221IGP2272A25
VSV30
SLU
ECM/PCM CONNECTOR A (32P)
'2: A./T (D16Y7, 016Y8 engine)13: CvT (D16Y5 enoin€)',4: A/T and D16y7 engine*5: Except A/T and D16Y7 €nsine'6r A/T (D16Y8 ensine)'7 Cw 1D16Y5 eng,nel and D16y8 ensrne'"'3:Bi..I?'Jt;".'e'.!ti.?i?l'""."T8"_";btfr
"fl
1-88
Wire side of female terminals
NOTE:Standard battery voltage12ts
'10i i,4/T (D16V5 engine)r11 Ex.ept M/l (D16V5 enqinelr12: 016Y5, D16YB enqine
r15:'97 016Y7 engine lcoupe: KL modet, sedan: KL (LXl modet),'98 D16Y7 engine
1
1
Sign.l
YELlNJ4 (No.4 FUEL INJECIOB)D ves No 4 ruel injector.Wilh engine runninq: ddly coniroted2BLUlNJ3 lNo. 3 FUEL TNJECTOBJDrives No. 3 lue Inteclor.38EDINJ2 (NO, 2 FUEI INJECTON)Drives No. 2 iuel njector.88NlNJl (No. 1 FUEL INJECTOB)Dives No. 1 ruelinjector.
5SO2SIITC (SECONDAFY HEATEDOXYGEN SENSOF HEATEF CONTFOL)
Orives secondary heated oxyqen sensorWith ignilion switch ON (lll: batery vo lageWith f!llywarmed up engine runninq:dLtv controled
6BLXAVHTPO2SHTC (PRIMAFY HEATEOOXYGEN SENSOR HEATERCONTROL)
Drives prihary healed oxygen sensorWith ignition switch ON ltt):baneryvottasewlhrdllywdrmedupcngne,Lnnrrq dury,orl.otred
FED{ESOL (EGF CONTRO!SOIENOIO VALVE)Drives EGF conlrolsoleno d vatve.Wilh EGR operating during drving wiih fu|y warmedup engrne: duty controttedWilh EGF nol opefating:O VE.EGRWith EGF operating du.ing driv og wilh iuty warmedup en9ine: dutycont.olted.With EGR not ooeralino; o V8*r/GFN/YELWS (VTEC SOLENOTD VALVE)Drives VTEC solenoid va veWilh eng ne at ow engine speed:O VWirh engine at h gh enqine speedr banery vohaae9BflN/BLKLG1 (LOGIC GROUND)Gro!nd lorthe €CM/PCM conlrotc rcuit.Lesslhan 1.0 V at a ttimest0ALKPG1 IPOWEF GFOUND)Ground ior rhe ECM/PCM power.tcuf.11YEVBLKIGPT iPOWEF SOUFCE)Power source forthe Ec[,l/PcM conlroWilh ignition swirch ON (tt): battery voltageWith gntron switch OFF: 0 VBLVBLUIACV (IDLE AIN CONTROL VALVE)Wilh engine r!nn ng: dlty contro ed13,.o8NIACV N lIDLE AI8 CONTFOLVALVE NEGATIVE SIOE)Drivesthe IAC valve {negalive side).
BLVBLUIACV P (IDLE AI8 CQNTROLVALVE POSITIVE SIDE)Orives IAC vaive (posilive side).
FEO/YELPCS (EVAP PURGE CONTFOTSOIENOIOVALVE)Drives EVAP pu.ge controtsolenoid vatve.Wilh engioe running, engin€ cootani betow 154,F'68'Cr bancry vohaSe w'ln ens nc runn,.o. eng,rc
GRN/YELFL8 (FUEL PU[4P FELAY)Orives fuelpump relay.0 V {or two secor os ahe' tJ n ng 'onir or \wnch ON ,,,,,
I7BLI(REOACC (A,/C CLUTCH RELAY)Drives A/C clutch relay.Wirh compressor ONr0 VWilh compressof OFF:banery votrage18GFN/ONNMIL (I\,lALFUNCTION INDICATOFWith MIL lLrned ON: 0 VWith illl turned OFF: banery volaqe19',AITC {AITERNAIOR CONIROL)se.ds ahernator controt signat.Wirh fully warmed.up engine ru.ntng: battery votlas€During drivins wnh smatl eteclricat toad: O V
20YEVGRNICM (IGNI'TION CONTROLMOOU!E)with ignltlon swilch ON (tl):b6n€ry vohageWilh ensine runnins: aboul t0 V (depending on
22BRN/BLKLG2 (LOGIC GAOUND)Ground for the ECM,/PCM conrrot ci'cu LLess than 1.0 V at a tt mes23BLKPG2 iPOWEA GROUND)Gro!nd lor the ECM/PCM power circuir.24YEUBLKlGP2 (POW€R SOUSCE)Power sou.ce lor the ECM/PCl, conrrolWnh ignilion swilch ON {it):battery vohageWilh ignilion switch OFF:0 V25*6WHT/FEDVSEF IREFEfl ENCE VOLTAGE)Provrdes reference voIaOe to TCM.With ignition switch ON (tt):abour 5 VWth gnition swltch OFF: O V21'1GFNFANC {RAOIATOR FANCONTFOL)Drives radialof fan ielay.With radialor fan f!nn nqr O VWilh radiato.tan stopped: batteryBL!2WBS (EVAP BYPASSSOLENOIO VALVE]Orives EVAP bypass sotenotd va !e.With ignirion swrrch ON (tt):barery vo rase
LT GRNA/VHTVSV (EVAP CONTFOTCANISTEFVENT SHUT VAIVE)Drives EVAP conlfot canisrer venl shulwnh ignirion sw'tch ON lr|l barery volaqe
WHT/NEDSLU (INTEFLOCK CONTFOLUNIT)Detects intenock conlrotLn t signalWhh ignition switch ON (tt)and brake pedadepf essed: battery vollage