1997 HONDA CIVIC Electrical troubleshooting

3.
5.
6.
1.
Fuel Cut-off Control
. During deceleration with the throttle valve closed, current to the fuel injectors is cut off to improve fuel economy at
speeds over the following rpm:. D16Y5 engine (M/T):850 rpm. D]6Y5 engine (CVT), D'16Y8 engine (USA M/T): 920 rpm
. Dl6Y8 engine (USA A,/I), D16Y7 engine (USA A,/T);910 rpm
. D16Y8 engine (Canada M/T), D16Y7 engine (canada): 990 rpm
' D16Y8 engine (Canada M/T): 1,000 rpm
. 816A2 engine: 970 rpm
. Fuel cut-off action also takes place when engine speed exceeds 6,900 rpm (D16Y5, D16Y7 engine; D'16Y8 engine:
7,000 rpm. 816A2 engine: 8.100 rpm), regardless of the position of the throttle valve, to protect the engine from
over-rewing. With '99 Dl6Y7 engine (A,/T) and '99 D16Y8 engine (A./T), the PCM cuts the fuel at engine speeds over
5,000 rpm when the vehicle is not moving.
IVC Compressor Clutch Relay
When the ECM/PCM receives a demand for cooling from the air conditioning system, it delays the compressor from
being energized, and enriches the mixture to assure smooth transition to the A,/C mode
Evaporative Emission (EVAP) Purge Control Solenoid Valve*'
When the engine coolant temperature is above 154'F (68'C). the ECM/PCM controls the EVAP purge control solenoid
valve which controls vacuum to the EVAP purge control canister.
Evaporative Emission (EVAP) Purge Control Solenoid Valve*a
When the engine coolant temperature above 154"F (68"C), intake air temperature above 32"F (0'C) and vehicle speed
above 0 mile (0 km/h) or [Ay'C compressor clutch on and intake air temperature above 160"F (41'C)], the ECM/PCM
controls the EVAP purge control solenoid valve which controls vacuum to the EVAP purge control canister.
Exhaust Gas Recirculation (EGR) Control Solenoid Valve*?
When EGR is required for control of oxides of nitrogen (NOx) emissions. the ECM controls the EGR control solenoid
valve which supplies regulated vacuum to the EGR valve
Alternator Control
The system controls the voltage generated at the alternator in accordance with the electrical load and driving mode,
which reduces the engine load to improve the fuel economy.
ECM/PCM Fail-safe/Back-up Functions
1. Fail safe Function
When an abnormality occurs in a signal from a sensor, the ECM/PCM ignores that signal and assumes a pre-pro-
grammed value for that sensor that allows the engine to continue to run.
2. Back-uD Function
When an abnormality occurs in the ECM/PCM itself, the fuel injectors are controlled by a back-up circuit independent
of the system in order to permit minimal driving.
3. Self diagnosis Function lMalfunction Indicator Lamp (MlL)l
When an abnormality occurs in a signal from a sensor, the ECM/PCM supplies ground for the lvllL and stores the DTC
in erasable memory. When the ignition is initially turned on, the ECM/PCM supplies ground for the MIL for two sec-
onds to check the MIL bulb condition.
4. Two Trip Detection Method
To prevent false indications, the Two Trip Detection Method is used for the HO2S, fuel metering-related. idle control
system, ECT sensor, EGR system and EVAP control system self-diagnostic functions. When an abnormality occurs,
the ECM/PCM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and
ON 0l) again, the ECM/PCM informs the driver by lighting the MlL. However, to ease troubleshooting, this function is
cancelled when you jump the service check connector. The MIL will then blink immediately when an abnormality
occurs,
5. Two (or Three) Driving Cycle Detection Method
A "Driving Cycle" consists ot starting the engine. beginning closed loop operation, and stopping the engine. lf misfir-
ing that increases emissions is detected during two consecutive driving cycles, or TWC deterioration is detected dur-
ing three consecutive driving cycles, the ECM/PCM turns the MIL on. However, to ease troubleshooting, this function
is cancelled when you jump the service check connector. The MIL will then blink immediately when an abnormality
occurs.
(cont'd)
1 1-1 05
.1.

4
The scan tool indicates Dlagnostic Trouble cod€ {DTc} Po4ol: lnsufficient flow in the Exhaust Gas Recirculation
(EGR) svstem.
Doscription
Deterioration (clogging, leakage, etc.) in the EGR line or EGR valve is detected by means of the changes in MAP before
and after the operation of the EGR valve.
lf deterioration has been detected during two cons€cutive driving cycles, the MIL will come on and DTC P0401 will be
stored.
Po$ible Causeg
. Clogging. leakage in the EGR line
. Faulty EGR valve
Troubleshooting Flowchart
\
- Tho MIL ht! bacn rgportod on.- DTC m40l is 3torod.
Problom vorification:
1. Do the ECM/PCM Reset Proce-
dure.2. Connect the SCS service con-
nector,3. Tost-drive under the following
conditions.- Without any electrical load- Decelerate lrom 55 mPh(88 km/h)lor at least 5 sec-
onos
lntormiftam f!ilu.a, ayltam ia OK
.t thb time,
- Clo.n tho inttkc mlnifold EGRport wittr carbursto. clotner.- Cl.an the pa$lgo insido tho
EGR valvo with crrburator
cloanol or aoglaca tha vllvo.

Automatic Transmission
Special Tools ......... .....'."".'-.-.' 14'2
Description .,....................-...... 14-3
power Flow ......,................. 14"6
Elestronic Control System .... . ................'..'.'.. 14-13
Hvdraulic Control .....'......" 1'l-19
Hydraulic F|ow...... .'.'.".'....11-21
Lock-up System '............ ... t/t'33
Electrical System
Component Locations....,.............'......'.............'.,. 14'39
PCM Circuit Diagram
lA/T Control Syst€m: '96 - 98 Models) .........'.. 1/t-40
PCM Tarminal Volt8ge/Measuring Condhions
{'96 - 98 ModeblA/T Control System ............
PCM Circuit Disgram(A/T Conlrol System: '99 - 00 Modsls) '..........' 14-44
PCM Terminal Voltage/Measuring Conditions('99 - 00 Models)A/T Control System ...
Troubleshooting Proceduros ....
Symptom-to-ComPonent Chari
Efectricaf SFiem - '96 - 98 Models '..-.-..."'.'..11-52
Eloqtrical System -'99 - 00 Modols ... .........". 1+54
EleclricatTroubl$hooting ('96 - 98 Models)
Valve Body
Repair .................... ........'.... 14-139
Valve
Assembly
ATF Pump
1,1-1i10
Inspection ...........'.......... 14-141
Main Valvs Body
Disass€mbf y/lnspoction/R.sssembly .'.'.'.'.. -. -. 1 1-1 12
Secondsry Valve BodY
Disa$embfy/lnspoction/Rsassembly ......'.'.'.'. 11-111
Regulator Valve Body
Disa$embly/lnspoction/Rea3sembly ..........'... 14-1{5
Servo Body
Disassombly/lnsp€ction/Reassembly .".'........ 14-146
Lock-up Valv6 Body
Dis$s.mbf y/ln3poction/Rea$embly .'.. -. -..'.'.' 1 1-1 17
Mainsh!ft
Dkassembly/lnep€ction Reassembly ..'...'........ 14'148
Inspoction .............'..........'. l it-149
Countsrshaft
Disa$embly/lnspeqtion/Rea3sembly .......'...'.. 1a-l51
Dba$ombly/Re$s.mblY11-152
til-46
I rl-48
Troubleshooting Flowcharts
Electrical Troubleshooting ('9!t - 00 Models)
Troublsshooting Flowchart3
Lock-up Control Solenoid vslvo A/B AssemblY
RePlacoment
Shift Cont.ol Solenoid Valve A/B A3sembly
Inspestion
Ona-way Clutch
Disassembh/lrupoction/Rca$embly .. "'........ l4-155
Clutch
lllustlttcd Ind.x {A48A, B4RA Transmlssion) ..' 14-156
tustr.tod Index (MrnA Transmi$ionl ............ til-158
...................... 14-153
L
14-56
1+81'
14-105
1+105
Replacoment ......
Mainshaft/Countorshaft Spo€d Sonsors
Replacemsnt ......'."'........... lit'108
Hydraulic System
Symptom-to-Componeni Chart
Hydraulic Sydemr+109
t4-113
1+116
11-117
Rea$emblY
14-106 Difforrr ial
llhdraied Index........ t4-156
B.ckhrh ln3poction. 14-167
Boaring Roplacemont..-..........11-167
..... 14-108 Diftrrsniial Carrior Repl8cemeni .'.-.............'...' lil-168
Oil Sall Romovalt4-t 59
Oil Soal ln3tallstion/Sidc Clearance'......'.....'... 1'l'169
Torqua Convertcr Housing Boarings
Mlin3haft Besring/Oil Scal Roplac.ment ."..'.. lil-172
Counio6hatt Betring R.plscem.nt ..'...... ....... 14-173
Test.....,......14-106
14-107
14-160
11-162
11-171
11-175
Replacement
Test .....,.,..........
Road Te3t
Linear Solenoid AsssmblY
Stall Speed
lllustrated Indax
Transmission/End Cover'. ....
Transmission Hou3ing,.............'.'......'....""..-.-.. 11-128
Torque Conve.ter Housing/Valvo Body ........... 14-130
End Cover
14-itB Park Stop
1+119 In3pection/Adiustmsnt...'......'.'............'...."""'14-175
Transmbgion
Reassombly
11-122 Torquo Convertet/Drivr Plsie ............'.'............'.. . l4-182
Transmission
11.726 Inrtallation
Tranlmission Housing Boarings
Msinsh.ft /CounteEhaft Bearings
B!pltcomgnt
Rcvo.3s ldlor Gear
lnrtallation
Cooler Flushing ..
Shift Cabls
Test
Fluid Level
Checkin9 .........."..'.'.....
Changing
Pressure Testing
Transmission
Transmission
Rgmoval ..
lil-176
.'..........'.'.'..... 1'l-183
.... lil-187
11-132Adiustmont
RemovaUlnttallation1,1-190
lit-191Transmisgion Housing
Removal ... '.'...... ......'..... 14-l3il
Tolque Convgrter Housing/valvs Body
Rsmoval .........,...... ............. 14-136
Valve CaDs
Description .......'................. t 4'138
Shift lndicator Panel
Adiu3tmant ..'.................. 14-192
ATF Coolor Hoses
Connection ..,............,.,....... l'l-192
Shift Lever .,........

Electrical Troubleshooting (,96 - gg Models)
Troubleshooting Flowchart - Lock-up contror sorenoid Varve A
Po$ible Cau3e
. Disconnecled lock-up controlsolenoid valvo A connector. Short or open in lock-uD controlsolenoid valv€ A wire. Fauliy lock-up contlol solonoidvalve A
PCM CONNECTORS
Wire side of female terminals
. OBD ll Scrn Toot indicates CodeP1753.. Self-diagnosis @ indicatorlight blinks once.
Check for a Short to Powo.:1. Turn the ignition switch OFF.2. Disconnect the A (32p) and B(25P) connsgl6ps 1rq- thaPCM.3. Turn the ignition swjtch ON 0t).4, Measure the voltage betweenthe 85 and Ag or A22 terminals.
Repair shoit to power in the wirebetw€en the 85 terminal and thglock-up coDtrol tolenoid valve A.
Mea3ure Lock-up Control Sole-noid Valve A RGislance:'1. Turn the ignition switch OFF.2. Measure the resistancebetween the 85 and A9 or A22terminals.
Check lor looso PCM conn€ctoB.lf nece$.ry, substituto a known-good aolonoid valve ass€.nblv olPCM end rech6ck.
ls the resistance 12 - 25 O?
NOTE: Record allfreeze data before you troubleshoot.
A l32P)
To page'14-57

Electrical Troubleshooting ('96 - 9g Modelsl
Troubleshooting Ftowchart - Lock-up control sorenoid Varve B
Possible Cause
. Disconnected lock-up controlsolenoid valve B connector' Short or open in lock-up controlsolonoid valve B whe. Faulty lock-up control solenoidvalve B
PCM CONNECTORS
Wire side of female terminals
. OBD ll Scan Tool indicrtes CodeP1758.. Self-diagnosis E indicrtor lightblinkstwice.
Check for a Shon to Power:1. Turn the ignition switch OFF.2. Disconnect the A (32p) and B(25P) connectors from thePCM,3. Turn the ignition switch ON t).4. Measure the voltage betweenthe 84 and A9 or A22 termi-nals.
Repeir short to power in the wirebetween the 84 teiminal and thelock-up control solenoid valve B.
Moasure Lock-up Control Sole-noid Valve B Resistance:1. Turn the ignition switch OFF.2. Measure the resistancebetween the 84 and Ag orA22 terminals.
Check for loose FCM connectors,lf necessary, substitute a known-good solenoid valve assembly olP1CM and rech6ck.
ls the resistance 12 - 25 O?
NOTE: Record all freeze data before you troubleshoot.
A {32P)
To page 14-59
t-

Electrical Troubleshooting ('96 - 9g Models)
Troubleshooting Flowchart - A/T Gear position Switch (Shortl
NOTE: Record allfreeze data before you troubleshoot.
Poiriblo Caus6
. Short in A/T go.. positionawhch wira. Fauhy A/T goa. position swhch
NOTE: Code P1705 (5)the PCM receives twoinputs at the same time.
is caused whengear position
' OBD ll Scln Toot indic.tes Cod6P1705.. Sofidi.gno3b E indicato] tighrblinksfivatim...
Observo th. A/T Go.r po3ition
Indicator:1. Turn the ignition switch ON l).2. Observe the A"/T gear positionindicator, and shitt to eachposttron,
Do any indicatoG stay onwhen the shift lever is not inthose positions?
Tho sy3tem b OK.t this timo.Check th6 wilc harnari for dam-rga.
M.r.ur. ATP R Vohlge:1. Shift to all positions otherthanE.2. Nileasure the voltage betweenthe 816 and Ag or A22 tormi-nats,
Check for short in tha wirobstwacn the 816 tcrminal and th6A/T go.r porition rwitch or A/Tg..r position indicltor. It wira i3OK, ch.ck for loo!€ FCfit connoc-to13. lf nacetaary, subrtitute aknown€ood Pcllt and roa|rsck.
ls there battery voltage?
Meesur. ATP NP Vohage:1. Shift to allpositions oth€r thanEorE.2. Moasure the voltage betweenthe 825 and A9 or A22 terminats.Check for short in the wireb.tw..n th6 B:I5 torminrt and th.A/T gclr poahion indicator. o. .short in tha wirrs between th.A/T gclr position indicator rndthe A/T gerr poiition switch. lfwir.3 r.o OK, chack tor loosoPCM conn.ctorr. It n.cosarry.sub.tituto a known-good pCM.nd r.chock.M.Gur. ATP D4 Voltago:1. Shift to allpositions otherthanlD.l.2. Measure the voltage betw€enrhe 824 and Ag or A22 termi-nals.
Check tor 3hort in tho wirobc{wocn the 824 terminrl and thoA/T ge.r poiition switch. lI wileia OK, chock tor loo3o plCM con-ncctoaa. It nacossarv, sublthute aknown-good PCM and rech€ck.
ls there approx. 5 V?
PCM CONNECTORS
Wire side of female terminals
YES
To page 14-6':
14-60

Electrical Troubleshooting ('96 - gg Modelsl
Troubleshooting Flowchart - A/T Gear position Switch (Open)
. OBD ll Scan Tool indicates CodeP1706.. Self-di.gnosk E indicator tightblinks six timos.
Measure ATP 04 Voltege:1. Shiftto E position.2. Measure the voltage betweenthe 824 and A9 or A22 terminals,
ls there voltage?
Possible Causo
. Disconnected A/T gear positionswitch conn€ctor. Open in A/T gear positionswitch wire. Faulty A/T gear position switch
Wire side of female terminals
NOTE: Record all freeze data before you troubleshoot.
Moasure ATP I Voltage:1. Turn the ignition switch ON 1 ).2. Shift to E position.3. Measure the voltage betweenthe B'f6 and Ag ot A22 tetmi-nats.
Ropai. op€n in the wire betwe€nthe Bl6 terminal.nd the A/T gearposition swhch.
Measur€ ATP NP Voltage:1. Shift to E or E position.2. Measure the voltage betweenthe 825 and A9 or A22 termi,nals,
Repeir open in the wir€ betweentho B25 terminal and th6 A/T geerposition indicator or tho A/T 96.rposition 3witch.
Rcpair open in the wire betweentto 82{ to.minal and th6 A/T geatlrosition 3witch.
To page 14 63
PCM CONNECTORS
NO
1
L
+62

Electrical Troubleshooting ('96 - 98 Modelsl
Troubleshooting Flowchart - Shift Gontrol Solenoid Valve A
Po$ible Cau3e
. Disconnected shift controlsolenoid valve A connector. Short oi open in shift controlsolenoid valve A wire. Faulty shirt control solenoid
PCM CONNECTORS
' OBD ll Scan Tool indicates CodeP0753.. Sett{iagnosis E indicator lightblinks seven tim6.
Check tor a Short to Power:1. Turn the ignition switch OFF.2. Disconnect the A (32P) and B{25 Pi connectors trom thePCM.3. Turn the ignition switch ON {ll).4. Measure the voltage betweenthe 83 and A9 orA22 terminals.
Repair short to powe. in the wir6between the 83 terminal .nd theshift control solonoid valvo A.
Moa3ure Shift Control SolenoidValve A Resistanc€:1. Turn the ignition switch OFF.2, Measure the resistancebetween the 83 and A9 or A22terminals.
Ch€ck for loose PCM connectors.lf n€c6srry, subatitute a known-good solenoid valve a3,sembly orPCM end rocheck.
ls the resistance 12 - 25 0?
NOTE: Record all freeze data before you troubleshoot.
A t32Pl
To page 14-65
Wire side ol female terminals