Code 77 (Intake Air Temperature Sensor)

INTAKE AIR TEMPERATURE SENSOR
Explanation
This trouble code is stored in the case of a short or break at the temperature sensor or on its supply wires. A prerequisite for detecting a break is a time interval of 3 min. after start and idling for at least 30 sec.

NOTE: After defect detection, a substitute value of 122°F (50°C) is used.

Troubleshooting
- Check temperature values by means of status monitoring. If not plausible: Check wire to Digital Motor Electronic (DME) Pin 77 and temperature sensor.
- Proceed with displayed scan tool diagnostic instructions where applicable.