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

Fig 1: Code 13 Schematic (Except 4.3L Turbo) Open Oxygen Sensor Circuit

Fig 2: Code 13 Flow Chart (Except 4.3L Turbo) Open Oxygen Sensor Circuit