2009 LAMBORGHINI MURCIÉLAGO Service Repair Manual

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ABS diagnosis is performed by a special computer program using the OBD II interface. In the event of a malfunction,
restore the system’s proper operation by means of the Troubleshooting Table. The same program is essential for JXDUDQWHHLQJD¿QDOFKHFNRIWKHV\VWHPDIWHUHYHU\PDLQWHQDQFHRSHUDWLRQ
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 $EVROXWHO\DYRLGVXGGHQEUDNLQJDVWKLVFRXOGFDXVHWKHZKHHOVWRORFN The program can be used in two ways:
• To display alarms stored in the control unit, which may be reset, if necessary; This procedure is extremely
useful during the initial phase to see whether errors are present and if they are present after ABS system maintenance.
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in the correct sequence, activating, when necessary, the ABS system. The full test requires lifting the car and two
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operations such as, for example, replacement of the ABS control unit or the entire wiring harness.
7KHIXOOWHVWGRHVQRWFDUU\RXWGLDJQRVLVLWRQO\FKHFNVIRUSURSHURSHUDWLRQ7RFDUU\RXWGLDJQRVLVXVH the errors stored in the control unit.

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LF open or shorted sensor LF wheel pick-up sensor short circuit or disconnected. Check wiring and connectors.
LF missing sensor or tone ring No signal from LF wheel pick-up sensor or not reading phonic wheel correctly.
LF sensor drop-out Signal from LF wheel pick-up sensor is interrupted frequently. Check pick-up sensor and mounting.
RF open or shorted sensor RF wheel pick-up sensor short circuit or disconnected. Check wiring and connectors.
RF missing sensor or tone ring No signal from RF wheel pick-up sensor or not reading phonic wheel correctly.
RF sensor drop-out Signal from RF wheel pick-up sensor is interrupted frequently. Check pick-up sensor and mounting.
LR open or shorted sensor LR wheel pick-up sensor short circuit or disconnected. Check wiring and connectors.
LR missing sensor or tone ring No signal from LR wheel pick-up sensor or not reading phonic wheel correctly.
LR sensor drop-out Signal from LR wheel pick-up sensor is interrupted frequently. Check pick-up sensor and mounting.
RR open or shorted sensor RR wheel pick-up sensor short circuit or disconnected. Check wiring and connectors.
RR missing sensor or tone ring No signal from RR wheel pick-up sensor or not reading phonic wheel correctly.
RR sensor drop-out Signal from RR wheel pick-up sensor is interrupted frequently. Check pick-up sensor and mounting.

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LF shorted DMP or open driver LF wheel DMP valve driver short circuit or jammed open. Check wiring or replace control unit.
LF open DMP or shorted driver LF wheel DMP valve driver disconnected or jammed closed. Check wiring or replace control unit.
LF shorted ISO or open driver LF wheel ISO valve driver short circuit or jammed open. Check wiring or replace control unit.
LF open ISO or shorted driver LF wheel ISO valve driver disconnected or jammed closed. Check wiring or replace control unit.
RF shorted DMP or open driver RF wheel DMP valve driver short circuit or jammed open. Check wiring or replace control unit.
RF open DMP or shorted driver RF wheel DMP valve driver disconnected or jammed closed. Check wiring or replace control unit.
RF shorted ISO or open driver RF wheel ISO valve driver short circuit or jammed open. Check wiring or replace control unit.
RF open ISO or shorted driver RF wheel ISO valve driver disconnected or jammed closed. Check wiring or replace control unit.
LR shorted DMP or open driver LR wheel DMP valve driver short circuit or jammed open. Check wiring or replace control unit.
LR open DMP or shorted driver LR wheel DMP valve driver disconnected or jammed closed. Check wiring or replace control unit.
LR shorted ISO or open driver LR wheel ISO valve driver short circuit or jammed open. Check wiring or replace control unit.

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LR open ISO or shorted driver LR wheel ISO valve driver disconnected or jammed closed. Check wiring or replace control unit.
RR shorted DMP or open driver RR wheel DMP valve driver short circuit or jammed open. Check wiring or replace control unit.
RR open DMP or shorted driver RR wheel DMP valve driver disconnected or jammed closed. Check wiring or replace control unit.
RR shorted ISO or open driver RR wheel ISO valve driver short circuit or jammed open. Check wiring or replace control unit.
RR open ISO or shorted driver RR wheel ISO valve driver disconnected or jammed closed. Check wiring or replace control unit.
open pump motor Electro-hydraulic unit pump circuit open. Replace control unit.
bad motor driver Electro-hydraulic unit pump malfunction. Replace control unit.
shorted pump motor Electro-hydraulic unit pump motor short. Replace control unit.
shorted relay ECU internal relay always closed. Replace control unit.open relayECU internal relay always open. Replace control unit.
bad relay driver ECU internal relay malfunction. Replace control unit.
stuck or inoperative brake switch Brake/ABS switch malfunction. Check and replace if necessary.
yellow warning lamp shorted to battery ABS warning light shorted to +12V.
yellow warning lamp shorted to ground ABS warning light shorted to ground.

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wheel speed error Speed difference on one or more wheels 20%.
mismatched wheel speeds Wheel speeds are incompatible.
wheel speed difference 8/16 bit CPU Electronic unit CPU fault.
vehicle inhibit code ABS control unit code is invalid.
excessive ISO time out ISO valve activation time exceeded. The valve can be damaged.
CPU loop time error CPU internal clock error.
excessive DMP time out DMP valve activation time exceeded. The valve can be damaged.
inoperative external watch-dog Relay control circuit malfunction.
RAM/ROM error 8 bit ROM/RAM fault.
ROM error 16 bit ROM/RAM fault.
RAM error 16 bit ROM/RAM fault.
valve coil circuit - battery voltage > 16V Valve actuator voltage > 16V
valve coil circuit - battery voltage < 9V Valve actuator voltage < 9V
valve coil circuit - battery voltage < 9.5V Valve actuator voltage < 9.5V

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1. Computer
2 . ABS/AIRBAG selector
3. OBD II connector
Diagnosis connection procedure:
1. Switch on the computer.
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OBD II connector is located under the dashboard on the driver side towards the central tunnel. Set the interfaceselector to ABS.
3. Connect the battery isolator and turn the ignition key to ON.
4. Start the ABS program by double clicking on the ABS icon.
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