1997 Nissan Hardbody mass air flow problem

Hi tgross,

What is the EXACT trouble code retrieved?

Was the MAF replaced new or used?

Here are the diagnostic for the trouble code.

DTC P0100: MASS AIRFLOW (MAF) SENSOR

1. Check Power Supply - Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on. Using
a voltmeter, measure voltage between MAF sensor harness connector terminal No. 3 (Green/Red wire) and ground. If battery voltage does not exist, repair fault in Green/Red wire. If battery voltage exists, go to next step.

2. Check Ground Circuit - Turn ignition off. Disconnect ECM harness connector. Loosen and retighten engine ground bolts. Using an ohmmeter, check continuity between MAF sensor harness connector terminal No. 2 (White wire) and ECM terminal No. 48. If no continuity exists, repair open in White wire. If continuity exists, go to next step.

3. Check Input Signal Circuit - Using an ohmmeter, check continuity between MAF sensor harness connector terminal No. 1 (Black wire) and ECM harness connector terminal No. 47. If no continuity exists, repair open in Black wire. If continuity exists, go to next step.

4. Check Component - Warm engine to operating temperature. Pull rubber protector away from mass airflow sensor connector so terminals can be backprobed. At mass airflow sensor connector, measure voltage between ground and terminal No. 1.

5. If voltage is less than 1.0 volt with KOEO and 1.0 to 1.7 volt at idling, check ECM connector for damage or corrosion. If voltage is not as specified, check for dust or foreign material in hot wire air passage of mass airflow sensor. If air passage is okay, replace mass airflow sensor.