Hall Effect Sensor

WARNING: To prevent engine from starting when checking Hall Effect sensor, disable ignition by disconnecting coil primary wires on 900 Series, or by unplugging connector to ignition cartridge on 9000 Series. DO NOT rotate engine more than necessary to check Hall Effect sensor.

Turn ignition on. On 900 Series, connect DVOM between ignition ECU terminals No. 4 (Red wire) and No. 10 (Black wire). On 9000 Series, connect DVOM between ignition ECU terminals No. 6 (Red wire) and No. 15 (Black wire). Voltage should be at least 10 volts.
On 900 Series, connect DVOM between ignition ECU terminals No. 10 (Black wire) and No. 24 (Green/Red wire). On 9000 Series, connect DVOM between ignition ECU terminal No. 15 (Black wire) and fuel injection ECU terminal No. 23 (Green/Red wire). Slowly turn engine over by hand. Voltage should be less than .4 volt (shutter open) or greater than 3.0 volts (shutter closed).
If voltage is not as specified, check wiring harness and connectors. If wiring and connectors are okay, replace Hall Effect sensor, located behind crankshaft pulley.
If engine performance is poor, check ignition timing. If timing marks appear to move back and forth, inspect sensor for chips or a loosely mounted magnet. Repair or replace as necessary.
CAUTION: Never replace a plastic body mass airflow meter with an aluminum body mass airflow meter, or ECU will be damaged.

NOTE: A fault in mass airflow meter (MAF) will cause CHECK ENGINE light to come on. Check induction system from throttle body to engine for air/vacuum leaks.