PCM HONDA CIVIC 1996 6.G Workshop Manual

Electrical Troubleshooting ('96 - g8 Modelsl
Troubleshooting Flowchart - Shift Control Solenoid Valve B
Possible Cause
' Disconnected shift controlsolenoid valve I connectol. Short or open in shift controlsolenoid valve B wire. Faulty shift control 30lenoidvalve B
PCM CONNECTORS
Wire side ot female terminals
. OBD ll Scan Tool indic.tes CodeP0758.. Solt-diagnosis E indicator lightblinks eight times.
Chock for a Short to Power:1. Turn the ignition swatch OFF.2. Disconnect the A (32P) and B(25P)connectors from the PCM.3. Turn the ignition switch ON (ll).4. Measure the voltage betweenthe 811 and Ag or A22 termi-nals,
Repair short to powar in the wirebotwcen the 811 torminal andthe shift control solenoid valve 8.
Measure Shift Cont.ol SolenoidValve B Resktance:1. Turn the ignition switch OFF.2, Meas u re the resistancebetween the Bll and A9 orA22 terminals.
Checl for loose PiCM connector3.lf nec€ssary, sub3titute a known-good solenoid v.lve assembly olPCM and recheck.
ls the resistance 12 - 25 O?
NOTE: Record allfreeze data before you troubleshoot,
A t32P)
To page 14 67
\

From page 14-66
Check Shift Conlrol Sol€noidvalve B tor a Short Circuit:1. Disconnect the 2P connectortrom the shift control solenoidvalve assembly.2. Check for continuity betweenthe 811 and Ag or A22 termi-nals,
Replir shon to ground in th€ wirebetwe.n the 811 terminal and the3hift control solenord valvo B.ls there continuity?
Measure Shift Control Solenoidvrlve B Resistance at the Sole-noid Connector:Measure the resistance betweenthe No.2 terminalofthe shift control solenoid connector and bodyground.
Check tor ooen in the wirebetw..n thc 81 1 t€tminal ard thashift control solonoid vrlv6 B.ls the resistance 12 25 O?
, 2 ll r . 5
PCM CONNECTORS
Wire side of female terminals
SHIFT CONTROL SOLENOID
CONNECTOR
GRN/WHT
Terminal side ol male terminals
14-67

Electrical Troubleshooting ('gO - 98 Modelsl
Troubleshooting Flowchart - Countershaft Speed Sensor
Po$iblo Causa
' Loosg or laulty conncctionbotwocn tho PCM and c.i hrr-n1't!' Disconnoctad countorahottlpo€{ san3or oonnoctot. Short or opon in countorshaftspeed lonsor wire. F ulty counte.lhalt spe6d s6n-sol
COUNTERSHAFT SPEED SENSORCONNECTOR
lFI,]1-F=r
9l
L_l
Terminal side ol male terminals
PCM CONNECTOR B I25P}
1
l'
NOTE; Record allfreeze data before you troubleshoot.
. OBO ll Scln Tool indicat6 Codem7z).. S6lt-dirgnosis E indic.tollight blink! nin. tim6,
ls the countershaft spoed sensorinstalled properly?
Moa3ure CountoEhaft Sp€ed S6n-sor Reaktanc€ at tho Son3or Con-noctor1. Disconnect the 2P connectortrom the countershaft spgedsensor connector,2. Measure the resistance of thecountershaft sDeed sensor,
ls the resistance 400 - 600 0?
Chock Countersh.ft Spood Scr|3olfor a Shoft Circuit:1. Disconnect the B {25P) connector from the PCM.2. Check for continuity betweenthe body ground and the 823terminal and 822 terminalindividually.
Repai. .hort in th. wiroa b.t$re€ntho 823 lnd 822 torminals .ndlho counteBhaft lpocd aenro..
To page 14-69
4-68
Wire side of temale terminals

Measure CounteFhaft Sp€€d S6n-
sor Resistance:1. Connect the countershaftspeed sensor 2P connector,2, Measure the resistancebetween the B23 and 822 telmtnals.
Repair looso terminal ol opon inthe wiro3 between th6 823 and822 terminal3 and the counter-shaft soeed aen3or.
ls the resistance 400 - 600 0?
Check tor loosc rcM connestors.ll nocessary, sub3titute a known-good PCM and recheck.
PCM CONNECTOR 8 I25PI
Wire side oI female terminals
14-69

Electrical Troubleshooting ('96 - 98 Modelsl
Troubleshooting Flowchart - Mainshaft Speed Sensor
NOTE: Record all freeze data before you troubleshoot.
Po$ible Cause
. Disconnect€d mainshaft sD€edSensor @nnoctot. Short or open in mainshattsJt€ed s6nsoa wire. Faulty mainshaft lpeed s6nso.
NOTE: Code P0715 (15) on the PCMdoesn't always mean there's an electricalproblem in the mainshaft or countershaftspeed sensor circuit; code P0715 (15)may also indicate a mechanical problemin the transmission.
MAINSHAFT SPEEOSENSOR CONNECTOR
Terminal side of male terminals
PCM CONNECTOR B I25PI
. OBD ll Scan Tool indicates Codem715.. Self-dirgnosi3 E indicatorlight indicstes Code 15.
Check the mainshaft and counter-shaft speed sensor installation.
Are the mainshaft and countershaftspeed sensor installed properly?
Moasure Mainshaft Spoed SgnsolRosistance at the Sensor Con-n€ctor:1. Disconnect the 2P connectorfrom the mainshaft speed sen-sor connector.2. Measure the resistance ot themainshaft speed sensor.
ls the resistance 400 600 O?
Check Mainshaft Sp6ed Sensorfor a Short Circuil:1. Disconnect the B {25P) connec'tor lrom the PCM.2. Check for continuity betweenbody ground and 815 terminaland the 814 terminal individu,
Repai. shon in the wi.os bstwoenthe 815 and 814 te.minals andthe mainshatt .Dood 3ensor.
ls there continuity?
To page 14-71
14-70
Wire side of female terminals

From page 14-70
Mea3uro Main3haft speed sensor
Resistance:1. Connect the ma;nshaft sPeed
sensol 2P connector,2. [/leasu re the resistancebetween the 815 and 814 ter_minals.
Run the Electical TrouH€.hootingFlowcirrt for cod. P0720 l9l.Check for loose P1CM connoctors.ll n€cesslrY, 3ubstitute a known'good PCM and racheck.
ls the resistance 400 - 600 O?
Check NM wire Continuityl1. Disconnect the 2P connectorfrom the mainshaft speed sen'
sor connector.2. Check for continuity between
the 815 terminal and the No. 1
terminal of the mainshaft
speed sensor connector.
Rgpsi. opon in thc wira bctwg€n
the 815 torminrl and th6.tain_shatt soeod lensoa,
Check NMSG Wire ContinuitYr
Check for continuity between the
814 terminal and the No.2 terminal of the mainshaft sp€ed sensorconnector,
Repair open in the wira botwGonthe 814 terminal and lhe main'shsft spo€d 3en3or.
Check for loo3o PCM connoctoB.ll neca$8ry, subditute a known-good PCM and rgchock.
PCM CONNECTOR B I25PI
Wire side oI female termlnals
MAINSHAFT SPEED SENSOR
CONNECTOR
14-71

Electrical Troubleshooting ('96 - 98 Modelsl
Troubleshooting Flowchart - Linear Solenoid
NOTE: Record all freeze data before vou troubleshoot,
Po$ible Caus6
. Disconnoctod lineaJ solonoidconnectot. Short or open in linoar solenoid
' Faulty linoar solonoidLINEAR
Terminal side ol male terminals
PCM CONNECTOR B I25PI
Wire side of female terminals
SOLENOID CONNECTOR
l;r]l
TT
YI
LI
REDWHT
OBO ll Scan Tool indicates CodeP176a.Self-diagnosi3 E indicatorlight indicates Code 16,
Measure Linear Solenoid Resist-ance at the Solenoid Connecto.:1. Turn the ignition switch OFF.2. Disconnect the 2P connectorlrom the linear solenoid connector,3. Measure the resistance ofthelinear solenoid.
ls the resistance approx. 5.0 O?
Check Linear Solenoid for a ShonCircuit:1. Disconnect the B 125P) connec-tor from the PCM.2. Check for continuity betweenthe body ground and the B1terminal and 82 terminal inda-vidually.
Repair short in the wires bgtwoenthe Bl and 82 terminab and thelineti solsnoid.
Meaaure Linoar Solenoid RGi3t-anc€:1. Connect the linear solenoidconnector.2, Meas u re the resistancebetween the 81 and 82 termi-nals,
Ropair looso terminal or open inthe wires botwe€n the 81 and 82telminals end the linear solenoid.
ls the resistance approx. 5.0 O?
To page 14-73
14-72

Check the G.ound Circuit:Check for continuity between theA9 and A10 terminals.
. Rapair opan in the wirobotweon th6 tormin.b Ag rndA10 and G101.. Raprir looc€ iunction connrc{or.. R.p.ir poor ground {G101}.
Chock tor 100!6 PCM connectors.ll nocessary, substituto a known-good PCM and r6ch6ck.
Ftom page 14-72
PCM CONNECTOR A I32P}
Wiro side of t6male terminals
14-73

Electrical Troubleshooting ('96 - 98 Models)
Troubleshooting Flowchart - Lock-up Control System
NOTE: Record all freeze data before vou troubleshoot.
Possible Cause
Faulty Lock-up cont.ol system
NOTE: Do not continue with this troublesnoonnoother DTCS have been corrected.until the causes of any
. OBD ll Sc6n Tool indicatG Codem7{0.. Self-diagnosis E indicator lightindicates Code 40.
Check tor Another Code:Check whether the OBD ll scantool or the E indicato, lightindicates another code.
Perform lhe Troublo3hooiingFlowchart tor the indicatedCode(s). Recheck for cod. P07il0lilol aftor iroubl€3hooting.
Does the OBD ll scan tool orthe E indicator light indicateanother code?
Tast Line Pressure:Measure the line pressure (seepage 14-119 and 14-120).
Repair tho hydreulic aystem a3necessary {3ee page 14-119).
Replace the Lock-up ControlSolenoid Valve Assembly andR6check;1. Beplace the lock up controlsolenoid valve Ay'B assembly(see page 14-105).2. Turn the ignitaon switch OFFand reset the PCM by removing the BACK UP (7.5 A) fusein the underhood fuse/relaybox for more than 10 seconds,3. Using the scan tool, check tobe sure that the engine coolant temperature is in 176'F(80'C) and above.4. Drive the vehicle at 55 mph(88 km/h) constantly for morethan one minute.5. Recheck for code P0740 (40).
Does the OBD ll scan toolindicate code P0740 {40)?The systom k OK at this time.
l'.
14-74

Troubleshooting Flowchart - Shift Control System
NOTE: Record all freeze data before vou troubleshoot.
Possible Cause
Faulty shift control system
. OBD ll Scan Tool indicates CodeP0730.. Sell-diagnosis E indicator
light indicates Code ill.
Check tor Another CoderCheck whether the OBD ll scantool or the E, indicator lightindicate another code.
Perlorm ths TroubleshoolingFlowch.rt for the indic.t.dCode(sl. Recheck tor code m730
l4'l I atter troubleshooting.
Does the oBD ll scan tool orthe E indicato'. tight indicate another code?
Test lst, 2nd, 3rd and 4th Clutch
Pressure:Measure the 1st, 2nd, 3rd and 4th
clutch pressure (see page 14119
thru 14-121).
Ropair the hydrlulic systom !snecessary {see page 14-1 19 and11-1211.
ls each clutch pressure within
the service limit?
Replace Shift Control Solenoidvalve Assembly, Linear SolenoidAssambly and Rechock:1. Replace the shift controlsolenoid valve A'/B assembly(see page 14-106).2. Replace the linear solenoidassembly lsee page 14 108).3. Turn the ignition switch OFFand reset the PCM memory byremoving the EACK UP (7.5 A)tuse in the under hood fuse/relay box for more than l0
seconds,4. Drive the vehicle at over 12mph (20 km/h) in 1st, 2nd,3rd
and 4th gear for more than 30seconds at P1 position.
5. Recheck tor code P0730 (41).
Does the OBD ll scan tool orthe Ed indicator tight indi
cate code P0730 {41)?
The swt6m is OK et this time.
NOTE: Do not continue with this troubleshooting until the causes ot any
other DTCS have been corrected.