Subaru Impreza 2004 Service Manual page 191

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CI: DTC P1090 TUMBLE GENERATED VALVE SYSTEM 1 (VALVE OPEN)
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec-
tion Mode.>.
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK TUMBLE GENERATOR VALVE RH.
1)Remove the tumble generator valve assem-
bly.
2)Check the tumble generator valve body.
CJ:DTC P1091 TUMBLE GENERATED VALVE SYSTEM 1 (VALVE CLOSE)
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-39, Inspec-
tion Mode.>.
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK TUMBLE GENERATOR VALVE RH.
1)Remove the tumble generator valve assem-
bly.
2)Check the tumble generator valve body.
Check
Is any other DTC displayed?
Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)
Check
Is any other DTC displayed?
Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)
EN(H4DOTC)(diag)-270
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4DOTC)(dia
g)-74, List of Diag-
nostic Trouble
Code (DTC).>
Replace the tum- Clean the tumble
ble generator valve generator valve.
assembly. <Ref. to
FU(H4DOTC)-41,
Tumble Generator
Valve Assembly.>
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)" <Ref. to
EN(H4DOTC)(dia
g)-74, List of Diag-
nostic Trouble
Code (DTC).>
Replace the tum- Clean the tumble
ble generator valve generator valve.
assembly. <Ref. to
FU(H4DOTC)-41,
Tumble Generator
Valve Assembly.>
No
No