Subaru Impreza 2004 Service Manual page 52

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK ENGINE COOLING SYSTEM.
NOTE:
Check the following items.
•Thermostat open stuck
•Coolant level
•Coolant freeze
•Tire diameter
V: DTC P0129 ATMOSPHERIC PRESSURE SENSOR CIRCUIT RANGE/PER-
FORMANCE
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
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.
Check
Is any other DTC displayed?
Is there a fault in engine cool-
ing system?
Check
Is any other DTC displayed?
EN(H4DOTC)(diag)-131
ENGINE (DIAGNOSTICS)
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).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0125.
Replace the ther- Replace the
mostat. <Ref. to engine coolant
CO(H4SO)-18, temperature sen-
Thermostat.> sor. <Ref. to
FU(H4DOTC)-28,
Engine Coolant
Temperature Sen-
sor.>
Yes
Inspect the rele- Replace the ECM.
vant DTC using <Ref. to
"List of Diagnostic FU(H4DOTC)-49,
Trouble Code Engine Control
(DTC)". <Ref. to Module (ECM).>
EN(H4DOTC)(dia
NOTE:
g)-74, List of Diag-
Atmospheric pres-
nostic Trouble
sure sensor is built
Code (DTC).>
into ECM.
NOTE:
It is not necessary
to inspect DTC
P0129.
No
No