Volvo All Engines (2017 Emissions) Fault Code: P05407F PID: EMS Intake Air Heater “A” Control
Volvo All Engines (2017 Emissions) Fault Code: P05407F PID: EMS Intake Air Heater “A” Control
Circuit description
The preheat function is used to warm up the inlet air during cold conditions both before and after cranking to make the starting easier and better for the environment at very low temperatures. This diagnostic trouble code (DTC) detects a faulty preheat function.
Conditions for diagnostic trouble code (DTC)
Preheating requested
The voltage at pin A14.EB:7 is less than 91 % of the battery voltage
Observable symptoms
Intake air heater (IAH) does not function
White smoke at cold start
Difficult to start in extreme cold
Probable cause
1) Wiring harness
2) Connector
3) Intake air heater (IAH) relay
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