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DTC P0102/16486 - MAF Circuit Low Input

NOTE: DTC is set when signal from Mass Airflow (MAF) sensor to Electronic Control Module (ECM) is too low.
  1. Inspect MAF sensor connector for looseness and/or corrosion. Repair sensor connector as necessary. Erase DTC memory and test drive vehicle. See CLEARING DTCS  in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step. If sensor connector is okay, go to next step.
  2. Check MAF sensor fuse. Replace if necessary. Turn ignition off. Disconnect MAF sensor connector. Disconnect ECM connector. Connect Test Box (VAG 1598/18) to ECM wiring harness. Terminal assignments of test box are identical to ECM connector's.
  3. Turn ignition on. Jumper test box sockets No. 1 and 6. Using a DVOM, check voltage between MAF sensor connector terminals No. 1 and 3. Voltage should be at least 11.5 volts. If voltage is as specified, go to step 5). If voltage is not as specified, go to next step.
  4. Turn ignition off. Recheck MAF sensor fuse. Replace if necessary. Check resistance between MAF sensor connector terminal No. 1 and ground. Check resistance between MAF sensor connector terminal No. 1 and test box socket No. 1. Resistance should be less than 1.5 ohms. If resistance is not as specified, go to next step. If resistance is as specified, repair open circuit between fuel pump relay and MAF sensor. Erase DTC memory and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to step 7).
  5. Jumper MAF sensor connector terminals No. 1 and 2, and check resistance between test box sockets No. 1 and 16. Jumper MAF sensor connector terminals No. 1 and 4, and check resistance between test box sockets No. 1 and 17. Resistance should be less than 1.5 ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair open circuit between MAF sensor and ECM connector. Erase DTC memory and perform test drive. See CLEARING DTCS  in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to step 7).
  6. Remove jumper and check resistance between test box sockets No. 16 and 17. Resistance should be infinite (no continuity). If resistance is as specified, go to next step. If resistance is not as specified, repair short circuit between MAF sensor connector and ECM connector. Erase DTC memory and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  7. Replace MAP sensor. Erase DTC memory and perform test drive. See CLEARING DTCS  in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  8. Replace faulty ECM. Test drive vehicle. Recheck DTC memory and verify DTC does not reset. If DTC resets, repeat testing procedure.
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