Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-447

EFI-447 Pulsed secondary air injection system (PAIR) solenoid valve, signal

Condition
Diagnostic trouble code (DTC) EFI-447 (Pulsed secondary air injection system (PAIR) solenoid valve, signal) will be stored 5 seconds after the engine is started if there is a short-circuit to ground/supply voltage or an open-circuit in the solenoid valve signal cable.





Substitute value
- pulsed secondary air injection system (PAIR) diagnostic disabled
- front and rear heated oxygen sensor (HO2S) diagnostic disabled
- fuel trim disabled

Possible source

Signal too high:
- short-circuit to supply voltage in signal cable
- defective pulsed secondary air injection system (PAIR) solenoid valve.

Signal too low:
- short-circuit to ground in signal cable

Signal missing:
- defective fuse 11B/5 (1998-)
- open-circuit in signal- or power cable
- contact resistance in terminals
- defective pulsed secondary air injection system (PAIR) solenoid valve.

Fault symptom[s]
- a muffled sucking sound can be heard from the engine compartment when the engine is idling.