Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Sonoma, and 1995 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
Verify a clean, tight connection for sensor ground. An open circuit at sensor signal terminal or ground terminal will result in a Code 13.
CODE 13 TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | ECM/PCM Terminal | Wire Color | ||
|---|---|---|---|---|
| "C" & "K" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "G" Series | ||||
| 4.3L A/T | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||
| "L" & "M" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "P" Series | ||||
| 4.3L | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| "S" & "T" Series | ||||
| 4.3L (VIN W) Pickup & A/T Utility | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||
| 4.3L (VIN Z) A/T Pickup | ||||
| O2 Sensor Signal | A10 | Purple | ||
| O2 Sensor Ground | A12 | Tan | ||