Passat V6-2.8L (ATQ) (2004)
Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Check the central termination resistor in the Engine Control Module (ECM):
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To do this, measure resistance between test box socket 58 + 60:
Specified value: 60 to 72 Ohms
If resistance value is not in expected range:
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Replace Motronic Engine Control Module (ECM) -J220-.
If resistance value is in expected range:
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Disconnect test box from Engine Control Module (ECM).
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Connect test box to control module wiring harness.
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Check CAN-Bus wires for shorts among one another:
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To do this, perform a resistance measurement between test box sockets 58 + 60:
Specified value: Infinity Ohms
If specified value is obtained (wires have no shorts):
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Eliminate malfunction in wires (see wiring diagram).
Voltage Supply For Engine Control Module (ECM), Checking
Voltage Supply For Engine Control Module (ECM), Checking
Recommended special tools and equipment
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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
Test requirements
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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 defroster 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: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test
Checking voltage supply at terminal 30
Vehicles with engine code AHA
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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 ATQ
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Measure voltage supply between sockets 1+62 and 2 + 62 of test box.
Specified value: at least 11.5 V