Air Flow Meter (Code 12)

WARNING: This page is about a different car, the 1985 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the 20-pin connector and measure the resistance between terminals 6 and 16, 6 and 15, and 6 and 11. See Figure . If no good, go to next step. If okay, check air flow meter flap. If flap is okay, replace control unit. If not okay, replace air flow meter.

20-PIN TERMINAL RESISTANCE VALUES

Application	Ohms
6-15	100-400
6-11	200-500
6-16	Any Except 0 or Infinity

If resistance readings in step 1) were not correct, check air flow meter resistance readings between terminals E and B, E and C, and E and D on air flow meter. Resistance should be as listed in table. If no good, replace the air flow meter.

Fig 1: Air Flow Meter Connector Terminals

AIRFLOW METER RESISTANCE VALUES

Application	Ohms
E-C	100-400
E-D	200-500
E-B	Any Except 0 or Infinity

If okay, check resistance readings between terminals B, C, D, E and ground. Resistance should be infinity. If okay, check air flow meter flap. If no good, replace air flow meter.