P1309
P1309DESCRIPTION
The acceleration sensor is used to sense rough road conditions. The sensor's signal is used by the Engine Control Module (ECM) to prevent wrongful misfire detection.
FAILURE CONDITIONS
The ECM will set a code and the MIL will turn on if the acceleration sensor signal is less than 1.5 or greater than 3.5 volts during two driving cycles. This code indicates an extremely rough or smooth road being sensed by the acceleration sensor or ECM.
The ECM will set a code and the MIL will turn on if the acceleration sensor signal indicates an acceleration of 0.3 g or greater when the vehicle speed is zero during two driving cycles. This code indicates some type of bump being read, with the car speed at zero, by the acceleration sensor or ECM.
Circuit Diagram:
Test Procedure Part 1:
Test Procedure Part 2:
