Passat L4-1.8L Turbo (AWM) (2004)
Engine Control Module: Component Tests and General Diagnostics
Control Module Supply Voltage Check
Voltage Supply For Engine Control Module (ECM), Checking
Recommended special tools and equipment
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V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
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The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK
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Fuel Pump (FP) Relay -J17- must be OK, check
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Generator (GEN) must be OK, checking:
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Battery voltage must be at least 11.5 volts.
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All electrical consumers such as, lights and rear window heating must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
Test sequence
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Connect test box to control module wiring harness, connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test
Checking voltage supply terminal 30
Vehicles with engine code AEB
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Measure voltage supply between sockets 2 + 3 of test box.
Specified value: at least 11.5 V
Vehicles with engine code ATW, AUG, AWM
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Measure voltage supply between sockets 1 + 62 and 2 + 62 of test box.
Specified value: at least 11.5 V
Continued for all vehicles
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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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Testing and Inspection/Scan Tool
Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking voltage supply terminal 15
Vehicles with engine code AEB
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Measure voltage supply between sockets 1 + 2 of test box.
Vehicles with engine code ATW, AUG, AWM
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Measure voltage supply between sockets 1 + 3 and 2 + 3 of test box.