A8 Quattro Sedan V8-4.2L (BGK) (2006)
Engine Control Module: Testing and Inspection
Engine Control Module, Checking Voltage Supply
Engine Control Module, Checking Voltage Supply
Test Prerequisites
‹› The respective fuses of Engine Control Module (ECM) (J623) must be OK:
‹› Motronic Engine Control Module (ECM) Power Supply Relay (J271) OK => [ Motronic Engine Control Module Power Supply Relay, Checking ]
‹› Ground (GND) connections between engine and chassis must be OK.
Voltage Supply at Terminal 30, Checking
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Connect test box (VAG1598/31) to wiring harness of Engine Control Module (ECM).
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Measure voltage supply between sockets 1 + 62 and 2 + 62 of test box (ignition switched off).
Specified value for each: at least 11.5 volts
If specified value is not obtained:
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Check wire connections to relay carrier and Ground (GND) connection of Engine Control Module (ECM) according to wiring diagram:
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Read readiness code => [ Readiness Code, Reading ] See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes. If DTC memory was erased, readiness code must be generated again => [
Readiness Code, Generating ] See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.
Voltage Supply at Terminal 15, Checking
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Measure voltage supply between sockets 1 + 3 and 2 + 3 of test box.
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Switch ignition on.
Specified value for each: at least 11.5 volts
If specified value is not obtained:
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Check wire connections to relay carrier and Ground (GND) connection of Engine Control Module (ECM) according to wiring diagram:
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Read readiness code => [ Readiness Code, Reading ] See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Monitors, Trips, Drive Cycles and Readiness Codes. If DTC memory was erased, readiness code must be generated again => [
Readiness Code, Generating ] See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.