Engine temp sensor 1 (T_ENG1), short circuit to ground
▶ How to fix
Check the connectors and wiring. Measure the resistance in Engine temperature sensor 1. The resistance shall be around 2.5k Ohm at 20º C. Measure voltage at pin A7_9, the voltage shall be around 5 V with sensor disconnected.
What you'll see
No driver-visible symptom recorded.
System reaction
Cold engine might get harder to start and an irregular idle.
Diagnostic depth
Detection
The voltage has been below 0.20 V.
Possible cause
Short circuit to ground (U31).