Subaru SVX 1992 Manual page 317

2-7 IT9HO1 FUEL INJECTION SYSTEM
H : TROUBLE CODE (24) - BY-PASS AIR CONTROL SOLENOID VALVE -
DIAGNOSIS : TROUBLE SYMPTOM :
" Air by-pass control solenoid valve inoperative . a Engine stall
" Abnormal signal emitted from ECU to by-pass a Erroneous idling
air control solenoid valve . * Engine breathing
Repair or replace harness connector.
Not OK
1 Check voltage of power supply for ECU .
OK
Not OK
4 Check input signal from by-pass air con-
trol solenoid valve .
2 Check harness connector between ECU
and main relay .
OK
3 1 Check power supply circuit of main relay .
+ OK
Replace main relay .
Repair or replace harness connector of main
relay power supply circuit .
5 Check harness connector between ECU
and solenoid valve .
* OK
Replace solenoid valve .
Repair or replace harness connector .
Not OK
Not OK
Not OK
OK
Not OK
Repair ECU connector and terminal .
Check contact of ECU connector terminal .
~r OK
Replace ECU .
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