1998 HONDA CIVIC Data Link Connector

Symptom-to-Com ponent Chart
Electrical System -'99 - 00 Models
r: The DTc in parentheses is the code E indicator light indicates when the Data Link connector is connected to the HondaPGM Tester.
DTCTE Indicatot
LighrMILDetostion ltemPage
P1705
(5)ElinksONA,/T gear position switch (short to grouno,14-265
P1706
(6)OFFONA"/T gear position switch (open)14-26€
P1870
(30)BlinksONShift control linear solenoid14-271
P1873
(31)BlinksONPH-PL control linear solenoid14-213
P1879
t32lBlinksONStan clutch control linear solenoid
Inhibitor solenoid
14-215
P1882(33)BlinksON't 4-277
P1885
(34)BlinksONDrive pulley speed sensol't 4-279
P1886
(35)BlinksONDriven pulley speed sensor14-281
P1888
(36)BlinksONSecondary gear shaft speed sensor
Shift control system
14-283
P1890
\421BlinksON14-245
P1891
(43)BlinksONStart clutch control system14-286
14-240

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

Troubleshooting Flowchart - Vehicle Speed Sensor (VSS)
NOTE: Record all freeze data before you troubleshoot'
Po$rible Ctuse
. Disconnected vehicle speed
sensor (VSS) connectol. Short or open in VSS wire' Faulty VSS
@. Make sure lifts, iacks, and sal€tY stands are placed properly lsoe section 1)'
. Set the parking brake securelv, and block the rear wheels'
. iacr upile rront or the vehicle, and support it with safety st'nds'
TCM CONNECTORS
Wire side of female terminals
. OBD ll Scan Tool indicates Code
P1791.. Setf-diagno3is E indicato. light
blinks tour times.
Refer to seclion 23 for vehicle
soeed sensor IVSSI test
Check the VSS Voltage:
1. Raise the vehicle2. Shift the transmission to lEposrtlon.3. Disconnect the A (26P) and B(22P) connectors from the
TCM.4. Turn the ignition switch ON {ll).
5. Rotate the front wheel and
check for the voltage between
the 85 and 413 or A26 termi-
nals. Block the other wheel so
at does not turn
Check for oP€n in the wire
between the 85 terminal and the
vehicle speed sensor {VSS}. lf
wire is OK, check the vSS (see
soction 23).
Does0Vandapprox 5 V or more
appear alternatelY?
Check for loos€ TCM connedors
lI nec€ssary, substitute a known'
good TCM and recheck.
14-243

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

Troubleshooting Flowchart - Manifold
NOTE: Record all freeze data before you troubleshoot
Absolute Pressure {MAPI Sensor
TCM CONNECTORS
Wire side of female terminals
PG.iblo Cau3€
. Dkconnoctod manilold .bsoluto
ore33urc IMAP) sensor connoc'
lor. Short or opcn in MAP s.nsor
MAP sen3or
. OBD ll Scan Tool indicates Code
P1793,. self-diagno3b E indicato. light
indicat€s Code 12.
Chock tor Another Cod€ or MIL
Blinking:1. Turn the ignition switch ON (ll).
2. Check whether the OBD ll scan
tool indicates another code or
the Mal{unction Indicator LamP(MlL) blinks (sse section 11).
Does the OBD llscan tool indicate
another code or isthe lVlL blink-
in9?
Measure VREF voltage:
1. Turn the ignition switch OFF.
2. Disconnect the A (26P) and B
(22P) connectors trom the
TCM.3. Turn the ignition switch ON (ll).
4, Measure the voltage between
the B2O and A13 or A26 termr
nals.
R€pair opon or 3hort in the wire
botwoan the 820 t€.minal and
the EcM.lsthere aPprox.5 V?
Msasure MAP IPB) volt.ge:
Measure the voltage betlveen the
82 and A13 or 426 terminals.
Repair opon ot shorl in the wiro
betwesn the 82 torminal end th€
MAP sensol.ls there approx. 3 V?
Check for loo3e TCM conn€stors.
lf nec*sarY, sub3titute a known'
good TCM and rechock.
WHT/RED
14-249

Electrical Troubleshooting ('99 - 00 Models)
Troubleshooting Flowchart - A/T Gear Position Switch (Short)
NOTE: Record all freeze data before you troubleshoot.
Po3sible Cause
. Short in A/T gear po3ition 3witch
. F.ulty A/T ge6r Position switch
NOTE: Code P1705(5) is caused when
the PCM received two gear Positioninputs at the same time.
PCM CONNECTORS
LGl (BRN/8LKI LG2 (BRN/8LKI
Wire side of female terminals
(cont'd)
14-265
B t25Pt llO(16P1
. oBD ll scln lool indicats code
P't705.. Self-diagnosb E indicator light
blinks fivetim€s.
Obseive tho A/T Gear Polition
lndicetor:1. Turn the ignition switch ON (ll).
2. Observe the A,/T gear positaon
indicator, and shift oach Posi-tion separately.
Tho ry3t6m is OK at this tims.
Check th€ wiro hsrno!! tor
damage.
Does any indicator stay on
when the shift lever is not an
that position?
M.Furo ATP R Vohtge:1. Shift to all positions other than
E.2. Measure the voltage between
the D6 and 820 or 822 termi'
nals,
Chock for lhort in tho wit€
betwe€n the D6 telminal and thg
A/T ge.r position 3witch or A/T
gear po3ition indicttoi, !nd
chcck for open in the witgs
botwo€n the 820 lnd 822 tetmi_n.ls and body g.ound (G1011. F
wiro3 ere OK, check tor loo3o ter'
minal fit in the PrCM connoctors.ll n6c€3sary, 3ubstitute a known-good PCM and rochock.
ls there approx. 10 V?
To page 14 266

t-Operation
t
ABS Control Unit
Main Control
The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the vehicle
speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration based on the
rate of deceleration.
The ABS control unit calculates the slip rate of each wheel. and it transmits the control signal to the modulator unit
solenoid valve when the slip rate is high.
The pressure reduction control is a three-mode system, that is pressure reduction, pressure retaining and pressure intensi-
fying modes.
Self -diagnosis Funqtion
The ABS control unit is equipped with a main CPU and a sub CPU, and the CPUS check each other'
The CPUs check the circuit of the svstem.
When the CPUS detect failure, they shift to the "system down mode" or the "control inhibition mode"
The self-diagnosis can be classifield into these four categories:
O: Initial diagnosis
@: Except ABS control
@: During ABS control
@: During warning
On-board Diagnosis Funstion
The ABS control unit is connected to the data link connector {16P).
The ABS system can be diagnosed with the Honda PGM Tester.
(cont'd)
MODEABS INDICATOR LIGHTMAIN
RELAY
SOLENOID
VALVECPURestart conditionDTC
SYSTE IV
DOWNONNo
operation
Drive
inhibitionOperation*rlgnition
switchOFF + ONMemory
CONTROL
INHIBITIONONNo
operalron
Drive
inhibitionOperationAutomaticMemory
*1: Except CPU failure
/
19-47

e\
t
ABS CONTROL UNIT 22P CONNECTOR
Wire side of female terminals
TerminalnumbelWirocororTerminalsignDe3cription
Volt.ge
ConditionE(lgnition Switch ON (ll)lOutput voltagolTqrminal namslterminils
RED/BLUFR-IN{Front-rightinlet)
Drives right-front inletsolenoid valve.
I-GNDriJ
ON-9ONOV
OFFAC: 3-6 V
OFF
/Connect the SCS servicq
connector IApprox. 3 V
BRNscs(Service checksignal)
Detects service check signal
{Diagnostic trouble codeindication)4-GND
SCS service connectorconnected.OV
SCS service connectordisconneded.Appro)(. 5 V
7BLU/RED(Warning
ramp)
Drives ABS indicator light (The
indicator light go€s off when
ABS control unit outputs bat-
tery volta9e),
7-GND
Indicator light ONApprox, 2 V
Indicator light OFFBattery voltage
8BLU/YELNot used.
10YEUBLKFL.OUT{Front-leftoutlet)
Drives left-front outletsolenoid valve.10-GNOON
ONOV
OFFAC:3-6 V
11RED/BLKFLIN{Front-l€ft inlet)
Drives left-front inlet solenoid11-GNDOFF
lconnect the SCS servicq
connector IApprox. 3 V
YEUBLU
FR.OUT(Front-right
outlet)
Drives right-front outlet
solenoid valve.12-GNO
l4LT BLUDLC(Data linkconnector)
Communicates withPGM Tester.Honda14.GNDApprox. 5 V
17BRNA/ELMCK
lMotor check)
Detects pump motor drivesrgnal.17.GNDPumpmotorreray
ONBattery voltage
OFFOV
19YELREDPMR(Pump motorreray,
Drives pump motor relay.
19-GND
ONONOV
OFFAC: 3-6 V
OFFponnect the SCS sewicq
connedor lApprox. 3 V
BLURR-OUT(Rear-right
outletl
Drives right-rear outlel
solenoid valve.
21-GNDuJ
ON
Pumpmotorrelay
ONOV
OFFAC: 3-6 V
OFF
lconnect the SCS servicq
connedor )Approx. 3 V
22BLKGND2(Ground 2)Ground for the ABS controluntt.22-GNDBelow 0.3 v
19-53