Jetta GLS L4-1.9L DSL Turbo (ALH) (2001)
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If resistance value is in specified range:
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Re-connect connectors to control module for Diesel-Direct fuel injection system.
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Remove air filter housing.
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Disengage connector from ABS control module and disconnect.
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Check CAN-Bus wires with terminal resistance in control module for Diesel-Direct fuel injection system.
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To do so, measure resistance anew between test box sockets 3 +25:
Specified value: 115...135 Ohm
If resistance value is not in specified range:
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Check CAN-Bus wires.
If no malfunctions are detected in wires:
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Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking CAN-Bus wires
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Remove air filter housing.
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Disengage connector from ABS control module and disconnect.
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Disengage connectors from control module for Diesel-Direct fuel injection system and disconnect the connectors.
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Check CAN data bus wires for short circuit to each other.
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To do so, measure resistance anew between test box sockets 3 + 25 at V.A.G 1598/18 Adapter - 68-pin:
Specified value: Infinite Ohm
If specified value is not obtained (wires have shorts):
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Eliminate error in wires according to wiring diagram.
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Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. See: Testing and
Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode, Selecting/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
If specified value is obtained (wires have no short circuit to each other):
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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/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Check CAN-Bus wires between test box sockets for open circuit according to wiring diagram:
Socket 68 (1598/22) and Socket 3 (1598/18)