1998 HONDA CIVIC electrical ignition

Electrical Troubleshooting ('99 - 00 Modelsl
Troubleshooting Flowchart - Shift Control System
NOTE: Record allfreeze data before you troubleshoot.
Po33ibl. Crus6
Frulty 3hift control ryrtom
. OBD ll Scan Tool indicrtd Codem730.. Self-dirgnosis E indicatorlight indicst€. Codo 41.
Check for Anoth€. Code:Check whether the OBD ll scantool or the E indicator lightindicate another code.
Prrf orm tho Troublc!hootingFlowch.rt for th. indicrt.dCod.l3l. R.ch.ck tor cod. m730141| .tt r troubldhootlng.
Doesthe OBD llscan tool orthe E indicator light indi-cate another code?
Test 13t, 2nd, 3rd .nd 4th ClutchPrglture:Measure the 1st, 2nd,3rd and 4thclutch pressure (see page 14-119thru 14 121).
R.prir tho hydrlulic ayrtam aan.c.3t..y lr.o p!9. lil-119 rnd1+1211.
ls each clutch pressure withinthe service limit?
Roplace Shift Control SolenoidValve Asembly. Linoar Sol.noidAssembly .nd Recheck:1. Replace the shift controlsolenoid valve A/B assembly(see page 14-106).2. Replace the linear solenoidassembly {see page 14-108}.3. Turn the ignition switch OFFand reset the PCM memory byremoving the BACK UP (7.5 A)fuse in the under-hood fuse/relay box for more than 10seconds,4. Drive the vehicle at over 12mph (20 kn/h) in 1st, 2nd, 3rdand 4th gear lo. more than 30seconds at lPll position.5. Recheck for code P0730 (41).
Doesthe OBD Ilscan tool orthe E ;ndicator light indi-cate code P0730 (41)?Th. sFtcm b OK .t this time.
NOTE: Do not continue with this lroubleshooting until the causes ot anyother OTCS have beon corrected.
I
14-100

Electrical Troubleshooting ('99 - 00 Models)
Troubleshooting Flowchart - E Indicator Light Does Not Come On
FCM CONNECTOR B (25P}
LGl {8RN/ALKI{BRN/8LK}
Wire side ol temale terminals
LGl IBNN/BLK} LG2 {BRN/BLK)
i2t5 6q
910t7
LG2
o) (o
The Pll indicator light does notcome on when the ignitionswitch is fi.st turned ON (ll). lltshould come on for about twoseconda.l
Check the Service Check Con-nector:Make sure the special tool (SCS
Service Connector) is not connect-ed to the service check connector?
ls the specialtool {SCS ServiceConnector) is not connected tothe seNice check connector.
Disconnect the special tool fromthe service check connector andr6check.
Check the Dll lndicator LightiShift to d position.
Check for loose terminal fit in thePCM connecto13. It necessary.sub3titute a known-good PCMand recheck.
Does the @ indicator lightcome on?
Check the Ground Circuit:1. Turn the ignition switch OFF.2. Disconnect the B (25P) con-nector from the PCM.3. Check for continuity betweenthe 820 terminal and bodyground, and between the 822terminal and body ground.
Repair open in the wiresbetween the B20 rnd 822 termi-nals and ground (G101), andrep.ir poor ground (G1011.
Measure Power Supply CircuitVoltage:1. Turn the ignition switch ON {ll}.2. Measure the voltage betweenterminals B1 and 822 andbetween terminals Bg and820.
Repair open or short in the wi.obetween th6 81 and/or 89 termi-nals and the PGM-FI main relav,and between th€ PGM-FI mainr€ley rnd the under-hood tus€/relay box.
To page 14''103
14-102

ElectricalTroubleshooting ('99 - 00 Modelsl
Troubleshooting Flowchart - Brake Switch Signal
PCM CONNECTORS
Wire side of female terminals
Shift lever cannot be moved tromE position with tho b.ake pedaldepressod.
Check Brake Light Operation:Depress the brake pedal.
Repair t ulty brake switch circuit{see s€ction 23}.Are the brake llghts ON?
Mea3ure STOP SW Vohage:1. Turn the ignition switch OFF.2. Disconnect the A (32P) and B{25P} connectors from thePCM,3. Measure the voltage betweenthe A32 and 820 or 822 termi-nals with the brake pedal
depressed.
Repair open in the wire betwsenthe A32 terminal rnd tho brrk6switch.
ls there battery voltage?
. Brak€ switch sign.l is OK.. Check for loose terminal fil inlhe PCM conn€ctors. lf neces-sary. substitute a known-goodPICM and recheck.. InsDect the breke 3witch circuitlsee section 231.
B {25P)
\
14-104

Electrical Troubleshooting ('96 - 98 Modelsl
Troubleshooting Flowchart - Throttle position (Tpl Sensor
Possible Cause
. Disconnected throftle position(TPl 3ensor connoctol. Short or open in TP sensor wire. Fauhy TP sensol
TCM CONNECTORS
Wire s;de of female terminals
. OBO ll Scan Tool indic.tes CodeP1790.. Self-diagnosis E indicator lightblinks three times.
Check lor Anothar Code or MILBlinking:1. Turn the ignition switch ON 1 ).2. Check whether the OBD ll scantool indicates another code orthe Malfunction Indicator Lamp(MlL) blinks (see secrion 11).
Does the OBD ll scan tool indicateanothercode oristhe MIL blink-ing?
Repair the PGM-FI systom (3eesection 111.
Measure VREF Voltage:1. Turn the ignition switch OFF.2. Disconnect the A (26P) and B{22P} connectors lrom theTCM.3. Turn the ignition switch ON{fl).4. Measure the voltage bet\iveenthe 820 and A13 or 426 termi-nals,
Repair open or short in thc wireb,stween the Bao tcrminal rnd theECM.
ls lhere approx. 5 V?
Measure TPS Voltago:Measure the voltage between theB4 and A13 or 426 terminals.
Repail open in the wire tr€tweonthe Erl t6.minal ind the TP sen3o..ls there 0.4 - 0.6 V?
Check for loose TCM connectors.lf necessary, substitute a known-good TCM and r6check.
NOTE: Record all freeze data before you troubleshoot.
BLK
WHT/RED
A {26P1

Electrical Troubleshooting ('96 - 9g Models)
Troubleshooting Flowchart - A/T Gear position Switch (Short)
NOTE: Record all freeze data before you troubleshoot.
Posrible Cause
. Short in A/T go.r positionswitch wire. Faulty A/T g€ar polition switch
NOTE: Code P1705(5) is caused whenthe TCM receives two gear positionInputs at the same time.
TCM CONNECTOR A {26P}
Wire side of female terminals
To page 14-245
. OBD ll Scan Tool indicates CodeP1705.. Seif-diagnosis @ indicator lightblinksfive times.
Obsorve the A/T gear positionindicetor:1. Turn the ignition switch ON1[).2. Observe tho Ay'T gear positionindicator, and shift to eachposition separately.
Th6 lyrtcm i3 OK at thi. tima.Check the wi.s hamels for drm.ag9.
Do any jndicators stay on when thesh;ft lever is not in that position?
Measure ATP R Vohage:1. Shift to all positions other thanE.2. Measure the voltage betweenthe 411 and A13 or A26 termi-nats.
Check for sho.t in tho wireb€twoon the Al1 t rminaland th6A/l ge.r polhion switch or A/Tgear position indicstor. lf wilo isOK check for loos6 TCM conncc-tora. It nocassery, subrtitute aknown-good TCM and r€chsck.
ls there approx. 10 V?
Measure ATP NP Volt.ge:1. Shift to all positions otherthan @ or @.2. Measure the voltage betweenthe A10 and 413 or 426 termi-nals,Ch.ck tor 3hort in th€ wircb€twe€n thc Al0 termin.l andthe A/T 96r. porition indicrtor,or a short in the wilea b?twecntho A/T gerr porition indic.to.and the A/T geer positionswitch. It wires ar6 OK, chsck forloose TCM conn.clols. ll nccNe3-sa.y, substituto a known-goodTCM rnd locheck.
ls there approx. 10 V?
Measure ATP O Vohage:1. Shift to all positions otherthanE,2. Measure the voltage betweenthe Ag and A13 or 426 terminals.
Checl tor short in the wirelr€tweon tho A9 terminal and theA/T g6a. position 3witch. lf wireb OK. check tor loos€ TCM con-nectors. lf nocelsary, substhute aknown-good TCM and rechack.
ls there approx. '10 V?
14-244
b

Electrical Troubleshooting (,96 - 9g Models)
Troubleshooting Flowchart - A/T Gear position Switch (Openf
NOTE: Record all freeze data before you troubleshoot.
Pos.ribls Cause
. Disconnocted A/T gear positionswitch connector. Open in A/T gear position switch
. Faulty A/T gear position switch
TCM CONNECTOR A I26PI
Wire side of female terminals
. OBD ll Scan Toot indicat* CodeP1706,. Solf-diagnosis E indicator tightblinb six times.
Measule ATP R Volt.gei1. Turn the ignition switch ON l).2. Shifi to E position.3. Measure the voltage betweenthe A11 and 413 or ,426 termi-nals.
Repair open in tho wire betwoenlhe A11 terminal and the A/Tgoar po3ition switch.
Measure ATP NP Volt.gei1. Shifrto E orE position.2. Measure the voltage betlveenthe A10 and A13 or 426 terminals.
Repair open in the wiro betweenthe A10 terminal .nd tho A/Tgea. poshion swhch.
Measure ATP D Vohage:1. Shift to E position.2. Measure the voltage betweenthe Ag and A'13 or 426 termi-
Repair open in the wire lretweenthe A9 terminel and the A/T gearposition 3witch.
To page 14-Z4j
14-246

Electrical Troubleshooting ('96 - 9g Models)
Troubleshooting Flowchart - lgnition Coil
NOTE: Record all freeze data before you troubleshoot,
Po3rible Cause
. Dbconnected ignition coil con-nectol. Short o. op6n ignition coil wire' F.ulty ignition coil
Wire side ot female terminals
. OBD ll Scan Tool indicates CodePOl25.. Soll-diagnosis E indicarol lightindicates Code 11.
Measure NE Voltrge:1. Disconnect the A {26p) connector from the TCM.2. Start the engine.3. Measure the voltage betweenthe A5 and 413 or A26 termi-nals,
R6p.i. open or short in the wireb€lween the A5 te.minsl and thoignhion coil. It wir€ b OK, checkthe ignition coil test lsoc aoction23t.
ls there battery voltage?
Check for loose TCM connector.It nec$sery. substilute a known-good TCM and .echeck.

Electrical Troubleshooting ('96 - 98 Models)
Troubleshooting Flowchart - TMA and TMB Sigrrals (cont,d)
TCM CONNECTOR 8 {22P}
Wire side of female terminals
PNK
PNK
PNK
from page 14 257
Check TMB Wire Continuity:1. Turn the ignirion switch OFF.2. Disconnect the C (31P) connec,tor from the ECM, and the I(22P) connector from the TCM.3. Check for continuity betweenthe 86 terminal ol the TCMand the C30 terminal of theECM,
Repair open in the wire betwe€nrhe TcM and the EcM.
Check TMB Wire tor a Short Cir-cuit:Check for continuity between the86 terminal ot the TCM or theC30 terminal ot the ECM andbody ground.
ls there continuity?
Check the TCM:1. Reconnect the B (22p) con-nector to the TCM, and the C(31P) connector to the ECM.2. Turn the ignition switch ON (ll).3. Measure the voltage betweenthe B6 terminat of the TCMand body ground.
ls there approx. S V?
Check for loose TCM connoctors.lf necessary, substitute e lnown-good TCM and recheck.
o
2I67t8I10
12131416171820
ECM CONNECTOR C 131P}
2a5678I10
ll1213la17118
/l/l )/)/l/l )aol'ol/
PNK
o
2456,8910
1213111516111E20
2157810
1213141516171820
It