Diagnostic Aids

Verify a clean, tight connection for the 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	PCM Terminal	Wire Color
Oxygen Sensor Signal	D7	Purple
Oxygen Sensor Ground	D6	Tan

Fig 1: Code 13 Schematic (3.1L) Open Oxygen Sensor Circuit

Fig 2: Code 13 Flow Chart (3.1L) Open Oxygen Sensor Circuit