ECM Power and Ground Circuit Check

ECM Power and Ground Circuit Check




Wiring Diagram

Circuit Description
When the ignition switch is turned ON, the main relay turns ON (the contact point closes) and the main power is supplied to ECM. And then ECM supplies 5 V power to each sensor (MAP sensor, A/C refrigerant pressure sensor, TP sensor and pressure sensor (included in EVAP leak check module)).
If 5 V power circuit to each sensors from ECM is shorted to ground, ECM stops engine and emission control operation.

Step 1 - 2 (Continued):

Step 2 (Continued) - 5 (Continued):

Step 5 (Continued) - 8 (Continued):

Step 8 (Continued) - 12:

Troubleshooting