EGR Problem
EGR valve sticking open at idle is usually accompanied by a rough idle and/or stalling. If Code 45 is intermittent, see INTERMITTENTS in TESTS W/O CODES - GASOLINE article.
CODE 45 TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | ECM/PCM Terminal | Wire Color | ||
|---|---|---|---|---|
| "C" & "K" Series | ||||
| 4.3L | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen 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 | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||
| "P" Series | ||||
| 4.3L | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||
| "S" & "T" Series | ||||
| 4.3L (VIN W) Pickup & A/T Utility | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||
| 4.3L (VIN Z) A/T Pickup | ||||
| Oxygen Sensor Signal | A10 | Purple | ||
| Oxygen Sensor Ground | A12 | Tan | ||