Lanos S Sedan L4-1.6L DOHC D-TEC MFI (2001)
Rough Road Sensor: Description and Operation
G SENSOR
The Engine Control Module (ECM) receives rough road information from the G sensor. The ECM uses the rough road information to enable or disable
the misfire diagnostic. The misfire diagnostic can be greatly affected by crankshaft speed variations caused by driving on rough road surfaces. The G
sensor generates rough road information by producing a signal which is proportional to the movement of a small metal bar inside the sensor.
If a fault occurs which causes the ECM to not receive rough road information between 30 and 80 mph (50 and 132 km/h), Diagnostic Trouble Code
(DTC) P1391 will set.
