Jetta Sedan L5-2.5L (BGP) (2005)
Motronic Engine Control Module (ECM) J220, Checking Voltage Supply
Special tools, testers and auxiliary items required
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Hand multimeter V.A.G 1526 or Multimeter V.A.G 1715
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Connector test set V.A.G 1594
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Wiring diagram
Test conditions
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The respective fuses of Motronic Engine Control Module (ECM) J220 must be OK.
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The Power Supply (Terminal 30, B+) Relay J317 must be OK, checking.
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Generator 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 defroster must be switched off.
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The parking brake must be applied, otherwise daytime running lights are switched on.
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On vehicles with automatic transmission, selector lever must be in position "P" or "N".
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If vehicle is equipped with an A/C system, it must be switched off
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The ground (GND) connections between engine and body must be OK.
Test sequence
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Connect test box to Motronic Engine Control Module (ECM) J220 wiring harness. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test
Checking voltage supply terminal 30
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Measure voltage supply between sockets 1 + 62 and 2 + 62 of test box.
Specification: at least 11.5 V
If specification is not obtained:
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Check wiring connections to engine compartment E-Box and the Ground (GND) connection of Motronic Engine Control Module (ECM) J220
according to wiring diagram.
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Erase DTC memory for Motronic Engine Control Module (ECM) J220. 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/Readiness Code, Generating
Checking voltage supply terminal 15
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Switch ignition on.
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Measure voltage supply between sockets 1 + 21 and 2 + 21 of test box.
Specification: at least 11.5 V
If the specification is not obtained:
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Check the wiring connections to engine compartment E-Box and the ground (GND) connection of Motronic Engine Control Module (ECM) J220
according to wiring diagram.
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Erase DTC memory for Motronic Engine Control Module (ECM) J220. 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/Readiness Code, Generating
CAN-Bus Terminal Resistance, Checking
CAN-Bus Terminal Resistance, Checking
Special tools, testers and auxiliary items required