Jetta Sedan L5-2.5L (CBTA) (2009)
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminals to the Motronic Engine Control Module
(ECM) (J623) electrical harness connector T121 terminals for an open circuit.
If the specified values were not obtained:
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Check the wiring for an open, high resistance or short to ground. Use the following table as a guide.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK:
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Replace Mass Air Flow (MAF) Sensor (G70)24 Fuel Injection System
If no malfunction is detected in the wiring and if the voltage supply was not OK:
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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: 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: Testing and Inspection/Scan Tool Testing