1999 HONDA CIVIC Control unit terminal

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Kickback
1. The motor operates when the ABS is functioning, and the fluid in the reservoir is forced out to the master cylinder
causing kickback at the brake pedal.
2. TheABScontrol unit operates the solenoid valve when the brake pedal is released afterthe initial diagnosis Youmay
hear the faint solenoid valve operation sound at this time. but it is normal.
Pump Motor
1. The pump motor operates when the ABS is functioning
2. The ABS control unit checks the pump motor operation during acceleration. You may hear the faint operation sound
at this time. but it is normal.
Brake Fluid Replacament/Air Blsading
1. Brake fluid replacement and air bleeding procedures are the same as for conventional brakes
Troubleshooting
1. The troubleshooting flowcharts explain the procedures on the assumption that the cause of the problem is still pre-
sent and the ABS indicator light is still on.
Note that troubleshooting following the flowchart when the ABS indicator light does not come on can result in incor-
rect judgment.
2. Ouestion the customer about the conditions when the problem occurred, and try to reproduce the same conditions
for troubleshooting.
self,diagnosis is made at various times such as the initial diagnosis, except ABS control. during ABS control, during
acceleraiion, during the specified vehicle speed, etc. Therefore, the symptom cannot be checked unless the check
conditions match with the problem conditions
3. When the ABS indicator light does not come on during the test drive, but the troubleshooting is performed based on
the DTC, check for the loose connectors. poor contact of the terminals, etc, before troubleshooting.
4. After troubleshooting, erase the DTC and test-drive the car. Be sure that the ABS indicator light does not come on.
5. The connector illustrations show the female connectors with a single outline and the male connectors with a double
ouflrne.
6. The connector terminal cavities containing female terminals are always numbered by looking at the connector from
the wire side. and the cavities containing male terminals are always numbered by looking at the connector from the
terminal side.
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19-55

Troubleshooting
The ABS indicator light does not go off after the engine is started.
- With engine running, ABSindicator light is ON.- With tho SCS sewice connec-to. connected l3oe page 19-561,no DTC is indicated,
Checkthe RR DEF RLY {7.5 A)tusein the under-dash fuse/relay box.
Raphco tha furo and rochack.
Check the ABS +B (20 A) fuse inthe under hood tuse/relay box.
R6pl.ce tho tu3c lnd r.ch.ck.
Chock for an open in the lG2 cir-GUrt:1. Turn the ignition switch ON (lt).2. Measure the voltage betweenthe ABS control unh 26P con-nector terminal No. 3 andbody ground.
Bopair opcn in tha wir. botw.cnth. RR DEF RLY 17.5 Al tus. .ndABS control unit.
Check tor an opon in thG Bl end82 circuit:Measure the voltage betweenbody ground and terminals No. 14and No. 15 individually.
Rrpair opsn in tha wiro t atwa,anthe ABS +B (20 Al fu.r .nd ABScontrol unh.
ls there banery voltage?
1To page 19-63)
ABS Indicator Light Does Not Go Off
YES NOTE: Feinstattthe luse it it is OK.
YES NOTE: Reinsta

the fuse if it is OK.ABS CONTROL UNIT 26P CONNECTOR
IG2IELK/BLUI
Wire side of female terminals
ABS CONTBOL UN]T 26P CONNECTOR
8T IWHT/GRNI
Wire side of temale terminals
19-62

lFrom page 19-621
Ch6ck lor . short to body ground
in ihe WALP Gircuit:1. Turn the ignition switch OFF.
2. Disconnect the ABS control
unit 22P and gauge assembly
5P connectors.3. Check for continuity betweenthe ABS control unit 22P con-nector terminal No. 7 andbody ground.
Ropair short to body g.ound in
tho wire betweon the ABS con_
trol unit and gauge aasembly.
Check the AgS cortrol unit:1. Connect the ABS control unit22P connector.2. Turn lhe ignition switch ON (ll).
3. Measure the voltage between
the ABS control unit 22P con'nector terminal No, 7 and
body ground.Check tor rn open in lho GND2
circuit:1. Connect the ABS control unit26P connector terminal No. 16
to body ground with a iumper
2. Measure the voltage between
the ABS control unit 22P con-
nector terminal No. 7 and
body ground.
ls there baftery voltage?
' Repair op€n in the wit€ betweenthe ABS control unit and bodyground.. Rep.ir poor ground lG40'1,G1(}2t.
ls there battery voltage?
Check tor loo3€ ABS control unitconnector!. lf necesaary, substi_tute a known-qood ABS controlunit and r€check,Check lor an open in the WALP
circuit:Measure the voltage between thegauge assembly 5P connectorterminal No. 1 and body ground.
Ropai. opon in the wiro botweenthe ABS control unit end gauge
assemblv.ls there battery voltage?
Replace the ABS indicrtor lightdriv6 ci.cuit in the gtuge assem-bly.
tv
Wire side ol female terminals
ABS CONTROL UNIT 22P CONNECTOR
ABS CONTROL UNIT 22P CONNECTOR
WALP {BLU/REDI
Wire side ol female terminals
ABS CONTROL UNIT 26P CONNECTOR
rt
GAUGE ASSEMBLY 5P CONNECTOR
.DY
Wire side of female terminals
WALP {BLU/REDI
wire side ol female terminals
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19-63

Troubleshooting
Wheel Sensor
Diagnostic Trouble Gode {DTC) ll-18: Wheol S€n3ol DiagnosisNoTE: The ABS indicator light comes on when only the drive wheels are turning, signal disturbance is detected, etc. Therefore,test-drive the car at a speed of 12 mph (20 krn/h) or more after turning the ignition:witch from OFF to ON fll), and if the ABSindicator light does not come on, the svstem is OK.
0TcAppropriate Terminal(0)srDE11) SrD€r 1, 12 (Right-front)No.8: FRoNo.21: FRI13, 14 (Left-front)No. 10: FLoNo.23: FL115, 16 {Right-rear)No. {: RRoNo. 17: RRl17, 18 (Left-rear)No.6: RLoNo. 19: RLI
RLl (LT BLU}FRl (GRN/BLKI
Wire side ol female terminals
NO
NOTE:. Normal voltage: Approx.2 V' 0 V: Replace the ABS controt unit.. 4 V or more indicates a short to power.
A8S CONTROL UNIT 26P CONNECTOR
RRO
IBLU/YELI
RR1 IGRN/YELIFL1 IGRN/ORN}
- With the ignition switch ON{ll), ABS indicator tighr doe.noi go off,- Aftsr driving, ABS indicatotlight comes on.- With the SCS so.vice connac-tor conn€c,ted {soe pege 19-561,DTCs 11-18 a.e indicrted.
Chock lhe wheol sensor ci.cuit:1. Disconnect the ABS controlunit 26P connector.2. lleasure the resistancebetween the appropriate wheelsensor (0) and (1) circuit termi,
. Reprir op€n in the l0l or {0 cir-cuit wiro, or shon to thc {01 cir-cuit wi.o in thc {11 circuit wircbctween ths ABS control unitand approprieto wheel a6nsor.. R.pl.ce th€ epp.opri.te wheal3€nloa.
ls the resistance OK?
/Frontr 750 - 1050 o/20"C, 68.F \\Rear: 850- 1150 O/20.C, 68"F /
Check toru short to body groundin the wheel senso. circuit:Check for continuity between theABS control unit 26P connectorappropriate wheel sensor (0) circuit terminali and body ground.
. Rapair short to body ground inth6 (0) or lll cilcuit wi..bctwa.n th6 ABS control unitand appropdaie whoel lonsor.. Rep|'c6 tho appropriatc whcelsanlor.
Chock tor a sho.t to powe. in thowheel3en3or circuit:1. Reconnect the ABS control unit26P connector,2. Start the engine.3. Measure the voltage betweenthe ABS control unit 26P con-nector appropriate wheel sen-sor (0) circuit terminal andbody ground.
Ropair rhon to powo. in the l0lor lll circuit wire batw.en th€ABS cont.ol unit and .pplopriatawhccl !€naoa,
ls there 4 V or more?
fio page 19-65)
19-64

Troubleshooting
Solenoid
Diagnostic Trouble Code {DTC} 31-38: Solenoid Diagnosis
YES
ABS CONTROL UNIT 22P CONNECTOR
Wire side of female terminals
ABS CONTROL UNIT 26P CONNECTOR
FL.OUT (YEL/ALK)- With the ignition switch ON(lll, ABS indicator light doesnol go oft. or ABS indic.to.light comes on while ABS i3functioning.- With the SCS servico connec-tor connected ls€. pag€ 19-561,DTCa 31-38 are indicstod.
Check for a short lo powor in thosol6noid circuitl1. Disconnect the ABS controlunit 22P and 26P connectors.2. Sta rt the engine.3. Measure the voltage betweenthe ABS control unit connectorappropriate solenoid circuitterminal* and body ground.
Ropri. short to powor in thcappropriate solanoid ci.cuit wirobotw6.n ths ABS cont.ol unitand modulrtor unit.
ls there battery voltage?
Check for a short to body groundin the 3olenoid circuit:Check tor continuity between theappropriate solenoid circuit termi-nal* and body ground.
. Repair short to body ground inlhe .ppropriato solonoid circuitwire betwoan th6 ABS controlunit and modllato. unit.. Replaco the modul.tor unit.
Check th€ ABS control unit:'1. Turn the ignition switch OFF.2. Connect the ABS control unit22P and 26P connectors.3. Connect the SCS service con-
4. Turn the ignition switch ON {ll}.5. Measure the voltage betweenthe ABS control unit 26P con-nector appropriate CONI circuitterminal++ and body ground.
Check for loos€ ABS control unhconnectora. It naceslrry, aub3ti-tutc . known-good ABS controlunit tnd recheck.
ls there approx. 3 V?
DTCAppropriateConnectorAppropriateTerminal
31: FRJN22PNo. 1
32: FR-OUT22PNo.12
33i FL'IN22PNo. 11
34: FL OUT22PNo.10
3s: RRIN26PNo.13
36: RR-OUT22PNo. 21
37: RLIN26PNo.25
38: RL-OUT26PNo.12RL.OUT IYEL}
Wire side of female terminals
DTCAppropriateTerminal
31: FR-lNNo. 2: SCOM
32: FR-OUTNo. 2: SCOM
33i FLINNo. 1: rcOM
34: FL-OUTNo. l: PCOM
35: RR{NNo.1:PCOM
36: RR-OUTNo. 1: rcOM
37rRL'lNNo. 2: SCOM
38: RL-OUTNo. 2: SCOM
RL.OUT (YEL}
19-66
(To page 19-671

(From page 19 66)
Check tor an op€n in th€ solenoidcircuit:Measure the voltage between theABS control unit connector appro-priate solenoid circuit terminal*and body ground.' Repsir opon in the appropriateCOM circuit wiro botwoon theABS control unit and modulatolunit.' Repair open in ihe appropriatesol€noid ci.cuit wiro betweentho ABS control unit and modu-lator unit.. Roplaco the modulator unil.
ls there approx.3 V?
Check loi loGe ABS control unitconnoctors. It necessarv, substi-tute a known-good ABS controlunit and recheck.
te
ABS CONTROL UNIT 22P CONNECTOR
Wire side of female terminals
ABS CONTROL UNIT 25P CONNECTOR
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FL.OUT {YEL/BLK}DTCConn€clorTerminal
31: FB-lN22PNo. 1
32: FR'OUT22PNo. 12
33: FL IN22PNo.1l
34: FL-OUT22PNo. 10
35: BR-lN26PNo. 13
36: RR-OUT22PNo.2l
37: BL-lN26PNo. 25
38:8I-OUT26PNo. 12
BL.OUT (YELI
Wire side of female terminals
19-67

Troubleshooting
ABS Pump Motor
Diagnostic Trouble Codo {DTC} 51-53r ABS pump Motor Diagnosis
YES NOTE: Short the PMR terminat to body
NOTE: Reinstall ground for a moment, and recheck the fuse.
the fuse if it is OK lf the fuse is blown, check for a short to bodyground in the MCK circuit.
AAS CONTNOL UNIT 22P CONNECTOR
7At0tl
1211192l22
PMR IYEL/RED} I JUMPERI WIRE
Wire side of female terminals
NO
NO
YES
NOTE: Reinstallthe fuse if it is OK.
NOTE: Short the PMF terminal to booyground for a moment, and recheck the fuse.lf the fuse is blown, check for a short to bodyground in the wire between the under-hoodABS luse/relaV box and pumD motor.
- With the ignition switch ON(ll), ABS indicator lighr doosnot go otf.- With tho SCS s€rvico conneetor conn€cted lsee page 19661,OTCa 51-53 aro indicated.
Check the MTR CHECK (7.5 A) fuse.
Repl.ce the fuse .nd recheck.
Replaco tho tuse and rocheck.
Rcphce th€ pump motor rol6y.
Check the pump motor powersource circuit:Turn the ignition switch ON (ll).
Ch€ck for a short to !'ows. in thopumP motor power 3ource ciacrrit:Remove th6 purnp motor relay,
Does the pump motor operate?
Bopair sho.t to powsr in the wir€botwoen the under-hood A8Stuse/.elay box and ABS pumpmotor.
Does the pump motor operate?
Check tor loGe ABS control unitconnoctors. lf nocessary, substi-tute a known-good ABS controlunit and roch€ck,
(To page 19-69)
19-68

tt
(From page 19-68)UNDER.HOOD ABSFUSE/RELAY 8()X
TERMINAL TERMINAL
PUMP MOTOR 2P CONNECTOR
MOTOR +8 lWHTl,$
rv) -
Y
Wire side ot female terminals
\lt
MOTOR +B {RED}MOTOR GND (BLK)
ABS CONTROL UNIT 22P CONNECTOR
(cont'dl
19-69
JUMPER WIRE
Wire side oI female terminals
Check the pump motor circuit:1. Remove the pump motor relay.2. Turn the ignition switch ON (ll).
3. Connect the pump motor relayconnector +8 and MOTOR terminals with a iumper wire tora momenr,
Ch€ck for an open in the pump
moior +B circuit:1. Turn the ignition switch OFF.2. Disconnect the pump motor2P connector,3. Turn the ignition switch ON (ll).
4. Connect the pump motor relayconnector +B and MOTOR ter-minals with a jumper wire.5. Measure the voltage betweenthe pump motor 2P connectorterminal No. l and bodyground.
Does the pump motor operate?
Repaia open in the wire botweentho under-hood ABS fuse/relaybox and pump motor.ls there battery voltage?
Check the pump motor opgra-tion:Connect the battery {+}terminal tothe pump motor 2P connector ter-minal No. 1. and the (-)terminalto
the terminal No. 2 for a moment.
ReDlaco lho modulator unit.(Feulty pump motor)Does the pump motor operate?
Chock for a short to body ground
in the PMR circuit:1. Turn the ignition switch OFF.2. Disconnect the ABS controlunit 22P connector.3. Check for continuity betweenterminal No. 19 and bodygrouno,
Repail opon in ths wirg botwgentho pump motor and bodv ground,
or poor ground (G,!09).
Ropair 3hort to body g?ound intha wire between the under-hood ABS fuse/rclay box andABS cortrol unit.
(To page 19-70)