Check Input Signal For ECM

Measure the voltage between ECM and chassis ground.

Connector & terminal 

(B135) No. 15 (+) - Chassis ground (- ): 

Is the voltage less than 0.2 V? 

YES. Go to  CHECK HARNESS BETWEEN MANIFOLD ABSOLUTE PRESSURE SENSOR & ECM CONNECTOR  . 

NO. Go to  CHECK INPUT SIGNAL FOR ECM (USING VEHICLE DIAGNOSTIC INTERFACE)  .