P1581 Blow-by heater signal

			Test results
1	COMPONENT CONCERNED	BLOW-BY HEATER RELAY WIRING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Blow-by heater control wiring	Check for short circuits to earth	Go to Step 2	Presence of short circuit to earth	Restore correct insulation to earth
2	COMPONENT CONCERNED	BLOW-BY HEATER RELAY WIRING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Blow-by heater control wiring	Check for a short circuit to Vbatt.	Go to Step 3	Presence of short circuit to Vbatt.	Restore correct insulation to battery positive
3	COMPONENT CONCERNED	BLOW-BY HEATER RELAY WIRING CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Blow-by heater control wiring	Check for an open circuit	End of diagnosis	Presence of open circuit	Restore the correct connections