ABS D1 Diagnose

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Generalinformation

Electroniccontrolunit(ECU)incorporatesself-diagnosisfunction.ABSwarninglampwillilluminateintheeventofsystemfailure.TroublecodescanbedisplayedwiththeABSwarninglamp.Troublecodescanalsobeaccessedwithsuitablecodereaderconnectedtothedatalinkconnector(DLC)ordiagnosticsocket.1994-95:DiagnosticsocketFig.1.1996-98:Datalinkconnector(DLC)Fig.2.ForDLCordiagnosticsocketlocationrefertoSystemlayoutandcomponents.

Accessingtroublecodes

EnsureignitionswitchedOFF.RemoveABSwarninglamprelay.SwitchignitionON.Checkwarninglampilluminates.Bridgediagnosticsocketterminals2and5.A:Fig.3Bridgedatalinkconnector(DLC)terminals4and15.B:Fig.3Wait5seconds.Warninglampextinguishes.Warninglampstartsflashsequence.Comparewithtroublecodetable.

Erasingtroublecodes

Accesstroublecodes.Disconnectdiagnosticsocketordatalinkconnector(DLC)bridgewireFig.3.Troublecodewillberepeateduntilcodeerased.Ifmorethanonetroublecodehasbeenflashed,reconnectbridgewireFig.3.Whenlasttroublecodeflashed,removebridgewire.RefitABSwarninglamprelay.

Troublecodeidentification

Troublecode Faultlocation

1-1 Startofsequence2-6 Brakepedalposition(BPP)switch2-7 ECUsupplycontinuous,ignitionOFF-systemrelay2-8 Nosolenoidvalvesupply-systemrelay

Manufacturer:LandRover Model:Discovery(90-98)3,9Enginecode: Output:134(182)4750Tunedfor:R-Cat Year:1994-98

AutodataLimited20089/20/2010

V7.412-ENGO195770

2-12 Wheelspeedsensor,RHfront-airgap2-13 Wheelspeedsensor,LHrear-airgap2-14 Wheelspeedsensor,LHfront-airgap2-15 Wheelspeedsensor,RHrear-airgap3-0 Hydraulicmodulatorsolenoidvalve,RHfrontinlet-ECUconnection/wiring3-1 Hydraulicmodulatorsolenoidvalve,RHfrontoutlet-ECUconnection/wiring3-2 Hydraulicmodulatorsolenoidvalve,LHfrontinlet-ECUconnection/wiring3-3 Hydraulicmodulatorsolenoidvalve,LHfrontoutlet-ECUconnection/wiring3-4 Hydraulicmodulatorsolenoidvalve,RHrearinlet-ECUconnection/wiring3-5 Hydraulicmodulatorsolenoidvalve,RHrearoutlet-ECUconnection/wiring3-6 Hydraulicmodulatorsolenoidvalve,LHrearinlet-ECUconnection/wiring3-7 Hydraulicmodulatorsolenoidvalve,LHrearoutlet-ECUconnection/wiring3-8 Hydraulicmodulatorsolenoidvalve,inlet,isolatingvalve-ECUconnection/wiring3-9 Hydraulicmodulatorsolenoidvalve,outlet,isolatingvalve-ECUconnection/wiring4-0 Hydraulicmodulatorsolenoidvalve,RHfrontinlet-ECUconnection/shortcircuit4-1 Hydraulicmodulatorsolenoidvalve,RHfrontoutlet-ECUconnection/shortcircuit4-2 Hydraulicmodulatorsolenoidvalve,LHfrontinlet-ECUconnection/shortcircuit4-3 Hydraulicmodulatorsolenoidvalve,LHfrontoutlet-ECUconnection/shortcircuit4-4 Hydraulicmodulatorsolenoidvalve,RHrearinlet-ECUconnection/shortcircuit4-5 Hydraulicmodulatorsolenoidvalve,RHrearoutlet-ECUconnection/shortcircuit4-6 Hydraulicmodulatorsolenoidvalve,LHrearinlet-ECUconnection/shortcircuit4-7 Hydraulicmodulatorsolenoidvalve,LHrearoutlet-ECUconnection/shortcircuit4-8 Hydraulicmodulatorsolenoidvalve,inlet,isolatingvalve-ECUconnection/shortcircuit4-9 Hydraulicmodulatorsolenoidvalve,outlet,isolatingvalve-ECUconnection/shortcircuit4-12 Wheelspeedsensor,RHfront-highresistance/opencircuit4-13 Wheelspeedsensor,LHrear-highresistance/opencircuit4-14 Wheelspeedsensor,LHfront-highresistance/opencircuit4-15 Wheelspeedsensor,RHrear-highresistance/opencircuit5-0 Hydraulicmodulatorsolenoidvalve,RHfrontinlet-ECU/solenoidvalvesupplyshortcircuit5-1 Hydraulicmodulatorsolenoidvalve,RHfrontoutlet-ECU/solenoidvalvesupplyshortcircuit5-2 Hydraulicmodulatorsolenoidvalve,LHfrontinlet-ECU/solenoidvalvesupplyshortcircuit5-3 Hydraulicmodulatorsolenoidvalve,LHfrontoutlet-ECU/solenoidvalvesupplyshortcircuit5-4 Hydraulicmodulatorsolenoidvalve,RHrearinlet-ECU/solenoidvalvesupplyshortcircuit5-5 Hydraulicmodulatorsolenoidvalve,RHrearoutlet-ECU/solenoidvalvesupplyshortcircuit5-6 Hydraulicmodulatorsolenoidvalve,LHrearinlet-ECU/solenoidvalvesupplyshortcircuit5-7 Hydraulicmodulatorsolenoidvalve,LHrearoutlet-ECU/solenoidvalvesupplyshortcircuit5-8 Hydraulicmodulatorsolenoidvalve,inlet,isolatingvalve-ECU/solenoidvalvesupplyshortcircuit5-9 Hydraulicmodulatorsolenoidvalve,outlet,isolatingvalve-ECU/solenoidvalvesupplyshortcircuit5-12 Wheelspeedsensor,RHfront-wiring5-13 Wheelspeedsensor,LHrear-wiring5-14 Wheelspeedsensor,LHfront-wiring



V7.412-ENGO195770

5-15 Wheelspeedsensor,RHrear-wiring6-0 Hydraulicmodulatorsolenoidvalve,RHfrontinlet-shortcircuit,twoECU/solenoidvalveconnections6-1 Hydraulicmodulatorsolenoidvalve,RHfrontoutlet-shortcircuit,twoECU/solenoidvalveconnections6-2 Hydraulicmodulatorsolenoidvalve,LHfrontinlet-shortcircuit,twoECU/solenoidvalveconnections6-3 Hydraulicmodulatorsolenoidvalve,LHfrontoutlet-shortcircuit,twoECU/solenoidvalveconnections6-4 Hydraulicmodulatorsolenoidvalve,RHrearinlet-shortcircuit,twoECU/solenoidvalveconnections6-5 Hydraulicmodulatorsolenoidvalve,RHrearoutlet-shortcircuit,twoECU/solenoidvalveconnections6-6 Hydraulicmodulatorsolenoidvalve,LHrearinlet-shortcircuit,twoECU/solenoidvalveconnections6-7 Hydraulicmodulatorsolenoidvalve,LHrearoutlet-shortcircuit,twoECU/solenoidvalveconnections6-8 Hydraulicmodulatorsolenoidvalve,inlet,isolatingvalve-shortcircuit,twoECU/solenoidvalveconnections6-9 Hydraulicmodulatorsolenoidvalve,outlet,isolatingvalve-shortcircuit,twoECU/solenoidvalveconnections6-12 Wheelspeedsensor,RHfront-nooutputsignal/airgap6-13 Wheelspeedsensor,LHrear-nooutputsignal/airgap6-14 Wheelspeedsensor,LHfront-nooutputsignal/airgap

Wheelspeedsensor,RHrear-nooutputsignal/airgap

ABSwarninglamp

Correctoperatingsequence-Fig.4

SwitchignitionON.LampilluminatesFig.4.Wait1-2seconds.Lampextinguishesbriefly.Lampilluminates.Drivevehicleforwardat5mph(7km/h)minimum.Lampextinguishes.

Generaltestprocedures

NOTE:DuetosmallsizeofECUharnessmulti-plugpinsitisadvisabletouseabreakoutbox.

Warninglampcircuit

Checking-Fig.5

SwitchignitionON.Checkwarninglampilluminates.Ifnot:Checkfuse14(10A).SwitchignitionOFF.RemoveABSwarninglamprelay.Bridgerelaybaseterminals30and87a.SwitchignitionON.Checkwarninglampilluminates.Ifnot:Checkwiringandbulb.

Wheelspeedsensors

Preparatoryconditions



V7.412-ENGO195770

Checkwheelbearingsforexcessiveplay.Adjustorreplaceasnecessary.Checkwheelspeedsensorsformechanicalsecurity.Inspectwheelspeedsensorringsvisuallyfordamageandcleanliness.

Checkingairgap

TechnicalDataAirgap NotspecifiedNumberofringteeth 60

Nomanualadjustmentofwheelspeedsensorairgapsispossible.Ifremovedorreplaced:Renewwheelspeedsensorbushandseal.Replacingwheelspeedsensor:Lightlyoilwheelspeedsensor.Insertwheelspeedsensoruntiltipcontactssensorring.

NOTE:Wheelspeedsensorwillbepushedbackintocorrectpositionwhenvehicleisdriven.

Checkingresistance-front-Fig.6&Fig.7

TechnicalDataTerminals Wheelspeedsensor Resistance15&32 Lefthand 950approx.17&34 Righthand 950approx.

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.CheckresistancebetweenbreakoutboxterminalsFig.6.Ifresistancenotasspecified:Disconnectrelevantwheelspeedsensormulti-plug.CheckresistancebetweenwheelspeedsensorterminalsFig.7.Ifresistanceasspecified:Checkwiring.Ifresistancenotasspecified:Suspectfaultywheelspeedsensor.Repeattestforotherwheelspeedsensor.

Checkingresistance-rear-Fig.7&Fig.8

TechnicalDataTerminals Wheelspeedsensor Resistance18&35 Lefthand 950approx.16&33 Righthand 950approx.



V7.412-ENGO195770

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.CheckresistancebetweenbreakoutboxterminalsFig.8.Ifresistancenotasspecified:Disconnectrelevantwheelspeedsensormulti-plug.CheckresistancebetweenwheelspeedsensorterminalsFig.7.Ifresistanceasspecified:Checkwiring.Ifresistancenotasspecified:Suspectfaultywheelspeedsensor.Repeattestforotherwheelspeedsensor.

Checkingvoltage-front-Fig.9&Fig.10

TechnicalDataTerminals Wheelspeedsensor Voltage15&32 Lefthand 0,4Vacapprox.17&34 Righthand 0,4Vacapprox.

EnsureignitionswitchedOFF.Raisevehicle.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Adjustvoltmetertomeasurealternatingcurrent.Turnroadwheelatapproximately60rpm.CheckvoltagebetweenbreakoutboxterminalsFig.9.Ifvoltagenotasspecified:Disconnectrelevantwheelspeedsensormulti-plug.Turnroadwheelatapproximately60rpm.CheckvoltagebetweenwheelspeedsensorterminalsFig.10.Ifvoltageasspecified:Checkwiring.Ifvoltagenotasspecified:Suspectfaultywheelspeedsensor.Repeattestforotherwheelspeedsensor.

Checkingvoltage-rear-Fig.10&Fig.11


EnsureignitionswitchedOFF.Raisevehicle.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Adjustvoltmetertomeasurealternatingcurrent.Turnroadwheelatapproximately60rpm.CheckvoltagebetweenbreakoutboxterminalsFig.11.Ifvoltagenotasspecified:



V7.412-ENGO195770

Disconnectrelevantwheelspeedsensormulti-plug.Turnroadwheelatapproximately60rpm.CheckvoltagebetweenwheelspeedsensorterminalsFig.10.Ifvoltageasspecified:Checkwiring.Ifvoltagenotasspecified:Suspectfaultywheelspeedsensor.Repeattestforotherwheelspeedsensor.

Checkingwaveform-front-Fig.12


EnsureignitionswitchedOFF.Raisevehicle.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Connectoscilloscopebetweenbreakoutboxterminals.Turnroadwheelatapproximately60rpm.Checkwaveformandvoltageofwheelspeedsensor.Ifwaveformorvoltagenotasspecified:Disconnectrelevantwheelspeedsensormulti-plug.Turnroadwheelatapproximately60rpm.Checkwaveformandvoltagebetweenwheelspeedsensorterminals.Ifwaveformandvoltageasspecified:Checkwiring.Ifwaveformorvoltagenotasspecified:Suspectfaultywheelspeedsensor.Repeattestforotherwheelspeedsensor.

Checkingwaveform-rear-Fig.13


EnsureignitionswitchedOFF.Raisevehicle.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Connectoscilloscopebetweenbreakoutboxterminals.Turnroadwheelatapproximately60rpm.Checkwaveformandvoltageofwheelspeedsensor.Ifwaveformorvoltagenotasspecified:Disconnectrelevantwheelspeedsensormulti-plug.Turnroadwheelatapproximately60rpm.Checkwaveformandvoltagebetweenwheelspeedsensorterminals.Ifwaveformandvoltageasspecified:Checkwiring.Ifwaveformorvoltagenotasspecified:Suspectfaultywheelspeedsensor.



V7.412-ENGO195770

Repeattestforotherwheelspeedsensor.

Relays

Checkingoperation-systemrelay-Fig.14

TechnicalDataTerminals Condition Resistance30&87 Batteryvoltagedisconnected30&87 Batteryvoltageconnected ZeroBattery+toterminal86Battery-toterminal85

NOTE:Ensurebatteryvoltagesupplyisconnectedcorrectly.Otherwiserelaycouldbedamaged.

EnsureignitionswitchedOFF.Removesystemrelay.Checkresistancebetweenrelayterminals.Connectbatteryvoltagesupplytospecifiedrelayterminals.Checkresistancebetweenrelayterminals.

Checkingsupplyvoltage-systemrelay-Fig.15

TechnicalDataTerminals Condition Voltage30&earth IgnitionOFF Batteryvoltage86&earth IgnitionON Batteryvoltage

NOTE:Electroniccontrolunit(ECU)mustbefittedandworkingcorrectlyinordertocarryoutsupplyvoltagechecks.

EnsureignitionswitchedOFF.Removesystemrelay.Checkvoltagebetweenrelaybaseterminalandearth.SwitchignitionON.Checkvoltagebetweenrelaybaseterminalandearth.Ifvoltagenotasspecified:Checkwiring,fusesandelectroniccontrolunit(ECU).

Checkingearthconnection-systemrelay-Fig.15

TechnicalDataTerminals Resistance85&earth Zero



V7.412-ENGO195770

EnsureignitionswitchedOFF.Removesystemrelay.Checkresistancebetweenrelaybaseterminalandearth.Ifresistancenotasspecified:Checkwiring.

Checkingoperation-pumpmotorrelay-Fig.14

TechnicalDataTerminals Condition Resistance30&87 Batteryvoltagedisconnected30&87 Batteryvoltageconnected ZeroBattery+toterminal86Battery-toterminal85


EnsureignitionswitchedOFF.Removepumpmotorrelay.Checkresistancebetweenrelayterminals.Connectbatteryvoltagesupplytospecifiedrelayterminals.Checkresistancebetweenrelayterminals.

Checkingsupplyvoltage-pumpmotorrelay-Fig.15

TechnicalDataTerminals Condition Voltage30&earth IgnitionOFF Batteryvoltage86&earth IgnitionON Batteryvoltage

NOTE:Electroniccontrolunit(ECU)mustbefittedandworkingcorrectlyinordertocarryoutsupplyvoltagechecks.

EnsureignitionswitchedOFF.Removepumpmotorrelay.Checkvoltagebetweenrelaybaseterminalandearth.SwitchignitionON.Checkvoltagebetweenrelaybaseterminalandearth.Ifvoltagenotasspecified:Checkwiring,fusesandelectroniccontrolunit(ECU).

Checkingearthconnection-pumpmotorrelay-Fig.15

TechnicalDataTerminals Resistance85&earth Zero



V7.412-ENGO195770

6-15

EnsureignitionswitchedOFF.Removepumpmotorrelay.Checkresistancebetweenrelaybaseterminalandearth.Ifresistancenotasspecified:Checkwiring.

Checkingoperation-ABSwarninglamprelay-Fig.16

TechnicalDataTerminals Condition Resistance30&87a Batteryvoltagedisconnected30&87a Batteryvoltageconnected ZeroBattery+toterminal86Battery-toterminal85


EnsureignitionswitchedOFF.RemoveABSwarninglamprelay.Checkresistancebetweenrelayterminals.Connectbatteryvoltagesupplytospecifiedrelayterminals.Checkresistancebetweenrelayterminals.

Checkingsupplyvoltage-ABSwarninglamprelay-Fig.17

TechnicalDataTerminals Voltage86&earth Batteryvoltage

NOTE:Electroniccontrolunit(ECU)andsystemrelaymustbefittedandworkingcorrectlyinordertocarryoutsupplyvoltagechecks.

EnsureignitionswitchedOFF.RemoveABSwarninglamprelay.SwitchignitionON.Checkvoltagebetweenrelaybaseterminalandearth.Ifvoltagenotasspecified:Checkwiring.

Checkingearthconnection-ABSwarninglamprelay-Fig.17

TechnicalDataTerminals Resistance85&earth Zero87a&earth Zero



V7.412-ENGO195770

6-15EnsureignitionswitchedOFF.RemoveABSwarninglamprelay.Checkresistancebetweenrelaybaseterminalsandearth.Ifresistancenotasspecified:Checkwiring.

Electroniccontrolunit(ECU)

Checkingsupplyvoltage-Fig.18

TechnicalDataTerminals Voltage9&earth Batteryvoltage

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.SwitchignitionON.Checkvoltagebetweenbreakoutboxterminalandearth.Ifvoltagenotasspecified:Checkwiringandfuses.

Checkingearthconnection-Fig.18

TechnicalDataTerminals Resistance27&earth Zero31&earth Zero

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Checkresistancebetweenbreakoutboxterminalsandearth.Ifresistancenotasspecified:Checkwiring.

Hydraulicmodulatorsolenoidvalves

Checking-Fig.19



V7.412-ENGO195770

TechnicalDataTerminals Hydraulicmodulatorsolenoidvalve Resistance23&27 LHfrontinlet 7approx.24&27 LHfrontoutlet 5approx.6&27 RHfrontinlet 7approx.7&27 RHfrontoutlet 5approx.21&27 LHrearinlet 7approx.22&27 LHrearoutlet 5approx.4&27 RHrearinlet 7approx.5&27 RHrearoutlet 5approx.

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.Checkresistancebetweenbreakoutboxterminals.

Pumpmotor

Checkingoperation-Fig.20

NOTE:DONOTallowpumpmotortorunformorethan2seconds.

EnsureignitionswitchedOFF.Removepumpmotorrelay.Bridgerelaybaseterminals30and87withaswitchedlead.Operateswitch.Pumpmotorshouldrun.Ifnot:Checkwiringandfuses.

Brakepedalposition(BPP)switch

Checkingoperation-Fig.21

TechnicalDataTerminals Condition Voltage25&earth Pedalreleased Zero10&earth Pedalreleased Zero25&earth Pedaldepressed Batteryvoltage10&earth Pedaldepressed Batteryvoltage

EnsureignitionswitchedOFF.DisconnectECUmulti-plug.Connectbreakoutboxtoharnessmulti-plug.SwitchignitionON.Checkvoltagebetweenbreakoutboxterminalsandearth.Depressbrakepedalwhilecheckingvoltage.



V7.412-ENGO195770

NOTE:Whenpedaldepressed,voltagemustbesuppliedtoterminal25beforeterminal10.

Checkingresistance-Fig.22

TechnicalDataTerminals Condition Resistance1&2 Pedalreleased

3&4 Pedalreleased1&2 Pedaldepressed Zero3&4 Pedaldepressed Zero

EnsureignitionswitchedOFF.DisconnectBPPswitchmulti-plug.CheckresistancebetweenBPPswitchterminals.Depressbrakepedalwhilecheckingresistance.

NOTE:Whenpedaldepressed,resistancemustchangeatterminals1and2beforeterminals3and4.

Hydraulicsystem

Bleeding

EnsureignitionswitchedOFF.EnsurereservoirtoppeduptoMAX.Bleedinsequence:RHfront,LHfront,RHrear,LHrear.Connecttubetobleedscrewandimmerseendinjarofcleanfluid.Depressbrakepedalfirmly5timesuntilpedalgoeshard.Openbleedscrew.Depressbrakepedalfully.Closebleedscrew.Tighteningtorque:15Nm.Allowbrakepedaltoreturn.Repeatprocessuntilfluidisairfree.Maintainfluidlevelinreservoirduringbleedingprocedure.TopupreservoirtoMAX.

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ABS D1 Diagnose

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