DTC P0100: MASS AIRFLOW (MAF) SENSOR Infiniti I30 I

1. Check Power Supply - Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 6) Turn ignition on. Measure voltage between MAF sensor harness connector terminal No. 3 (Red wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, verify harness continuity between MAF sensor and ECM, and MAF sensor and ECCS relay. Repair harness or connectors as necessary.
2. Check Output Supply Circuit - Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 7) Disconnect ECM harness connector. Check continuity between MAF sensor connector terminal No. 2 (Black wire) and ECM terminal No. 55. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
3. Check Input Signal Circuit - Check continuity between MAF sensor connector terminal No. 1 (White wire) and ECM harness connector terminal No. 54. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
4. Check Component - Ensure MAF sensor hot wire is not damaged or contaminated. Check ECM and MAF sensor harness connectors for damage, corrosion or pushed-out pins. Loosen and retighten engine ground screws. (Scheme 7) Repair if necessary. If no problems are found, go to next step.
5. Turn ignition on. Measure voltage between MAF sensor harness connector terminal No. 1 and ground. (Scheme 6) Voltage should be as follows: Key on, engine off; less than one volt. Key on, engine running; 1.3-1.7 volts. Engine running between idle and 4000 RPM; about 1-4 volts. If voltage is not as specified, remove MAF sensor. Check for hot wire for damage or contamination. Repair or replace MAF sensor.

Scheme 6

Scheme 7