A8L Quattro Sedan W12-6.0L (BSB) (2005)
‹› Vehicle speed must not drop to below 5 km/h during test.
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End road test and switch ignition off.
If no speed is displayed:
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Check Data-Bus wiring according to wiring diagram.
Checking wiring
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Connect test box to wiring harness on corresponding Engine Control Module at connecting test box for wiring test, refer to Repair Manual,
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Remove instrument cluster, refer to Repair Manual
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Repair malfunction in CAN-Bus wires between both Engine Control Modules and (J285)Instrument Cluster Control Module (J285) according to
wiring diagram:
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Erase DTC memory of Engine Control Module => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Modes 01 - 09, Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code => [ Readiness Code, Generating ] See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.