Jetta Sedan L5-2.5L (CBTA) (2009)
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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Disconnect the T121 connector.
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Using a multimeter, check for continuity between the MAF / IAT sensor (G70 / G42) electrical harness connector terminal 1 to an engine ground,
refer to the wiring diagram.
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Using a multimeter, check for continuity between the MAF / IAT sensor (G70 / G42) electrical harness connector terminal 3 to terminal 1, refer to
the wiring diagram.
Specified value: OL or no continuity.
If the specification was not obtained:
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Repair the short to ground.
If no malfunction is detected in the wiring:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.