Diagnostic Aids

Verify a clean, tight connection for ground circuit No. 413. An open circuit at sensor signal terminal or ground terminal will result in a Code 13.

CODE 13 ECM TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application

ECM Terminal

Wire Color

All With 4L80-E Transmission ⁽¹⁾

Oxygen Sensor Signal

C14

Purple

Oxygen Sensor Ground

C13

Tan

⁽¹⁾	The 4.3L oxygen sensor has 3 wires: sensor signal, common ground and heating element.

Fig 1: CODE 13, Schematic, Open Oxygen Sensor Circuit

Fig 2: CODE 13, Flowchart, Open Oxygen Sensor Circuit