Diagnostic Aids
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- The drive motor generator position sensor circuits operate at very low current. Just a few ohms of additional circuit resistance may cause position sensor signal degradation. Extreme care must be taken when probing terminals and manipulating harnesses.
- The sensor circuit loops are twisted pair with each pair covered in a foil shield. The shield circuits outside of the transmission are grounded to a stud on the drive motor generator power inverter module assembly.
- Ensure the drive motor generator position sensor harness shield circuits are properly grounded prior to testing.