Pin 2 is signal on the ECU for the lambda

SECS wiring is:

PIN 8 (BLACK) > ECU PIN 1: GROUND

PIN 7 (RED) > ECU PIN 20: 12V POSITIVE SUPPLY

PIN 5 (PURPLE) > ECU PIN 25: IGNITION SIGNAL FOR RPM READING

PIN 4 (GREEN) > ECU PIN 17: THROTTLE POSITION SENSOR

PIN 3 (BLUE) > ECU PIN 29: ENGINE COOLANT TEMPERATURE SENSOR

PIN 2 (YELLOW) > ECU PIN 31: AIR CHARGE TEMPERATURE SENSOR

PIN 1 (WHITE) > ECU PIN 15: MAP SENSOR