I have this code. Replaced speed sensor already and checked the harnesses. Found low voltage at the ecm and am leaning towards that but want to be sure as it is expensive.
Try doing these troubleshooting procedures first. IIRC the stabilized voltage supply/return for both LH & RH speed sensors comes from the same pins on the ECM, so if it was an ECM issue surely the problem would be on both sides not just on one.? EDIT: Just checked - same wires both sides. P769 Yellow is supply, P770 White is Return. If you want an electrical schematic please post a Serial Number to identify the correct one.
I am aware of that, i have 8v supply and nothing on return. When i check harness all resistance is good and continuity good. At J2 pin# 13 i show only 2 volts at the ecm for return which should be 8v? HSX00782 is the serial.
I'll send you the schematic. Keep an eye on your messages. Go through both procedures above and see where it leads you. According to the schematic I have, P769-YL supply comes from Pin 56, and P770-WH returns to Pin 30, both on Connector J1 of the ECM.
Ok. Will do. Appreciate the help.
Schematic should be in your inbox. Also be aware that to get proper readings on a number of tests you will need a set of spoons to slide down the back of the connector pins to measure voltage, continuity, etc, while the connector remains connected to the machine harness.