2009 SUBARU TRIBECA check engine

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Page 1324 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-163
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AJ:DTC P0128 COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW 
THERMOSTAT REGULATING TEMPERATURE)
DTC DETEC

Page 1327 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-166
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ign

Page 1330 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-169
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ign

Page 1333 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-172
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check DTC using 
“List o

Page 1336 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-175
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK HARNESS BETWEEN ECM AND 
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ign

Page 1339 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-178
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check DTC using 
“List o

Page 1340 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-179
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
5 CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following item.
•Loose part and in

Page 1343 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual EN(H6DO)(diag)-182
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
1CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Check DTC using 
“List o