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PTO Switch: Operation

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The input is used only to tell the PCM (or ECM-Diesel) that the PTO has been engaged. The PCM (or ECM) will disable (temporarily shut down) certain OBD II diagnostic trouble codes when the PTO is engaged.

JTEC and NGC Engine Controllers:  When the aftermarket PTO switch has been engaged, a 12V + signal is sent through circuit G113 to PCM pin A13. The PCM will then sense and determine that the PTO has been activated.

CM 845 or CM 848 Diesel Engine Controllers:  When the aftermarket PTO switch has been engaged, a 12V + signal is sent through circuit G113 to ECM pin B38. The ECM will then sense and determine that the PTO has been activated.

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