A8L Quattro Sedan W12-6.0L (BSB) (2005)
Check resistance
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Check resistance between terminals of thermostat. Specification: 14.0 to 18.0 ohms
If specification is not obtained:
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Replace Map Controlled Engine Cooling Thermostat (F265)
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Erase DTC memory of Engine Control Module => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and
Control Systems/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: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.
If specification is obtained:
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Check wires to control module according to wiring diagram.
Check wires to control module
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Connect test box to Engine Control Module (ECM) (J623) wiring harness on connecting test box for wiring test, refer to Repair Manual,
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Check wire between test box socket 116 + terminal 2 of 2-pin connector for open circuit according to wiring diagram. Wiring resistance: max. 1.5
ohms
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Check the wire for short circuit to B+ and Ground (GND). Specification: infinite ohms
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Check wire between 1-pin connector terminal 2 and Motronic Engine Control Module (ECM) Power Supply Relay (J271) for open circuit
according to wiring diagram. Wiring resistance: max. 1.5 ohms