Subaru 2009 IMPREZA Service Manual page 677

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CU:DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT MALFUNCTION
(LOW INPUT)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION<Ref. to GD(H4SO)-170, DTC P1492 EGR SOLENOID VALVE SIGNAL #1
CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Criteria.> <Ref. to
GD(H4SO)-174, DTC P1494 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (LOW IN-
PUT), Diagnostic Trouble Code (DTC) Detecting Criteria.> <Ref. to GD(H4SO)-174, DTC P1496 EGR SO-
LENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC)
Detecting Criteria.> <Ref. to GD(H4SO)-174, DTC P1498 EGR SOLENOID VALVE SIGNAL #4 CIRCUIT
MALFUNCTION (LOW INPUT), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Improper idling
• Poor driving performance
• Engine breathing
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-55,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-44, PROCEDURE,
Inspection Mode.>.
EN(H4SO)(diag)-260