1.CHECK ANY OTHER DTC ON DISPLAY.
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Is any other DTC displayed?
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Check DTC using “List of Diagnostic Trouble Code (DTC)”. 
NOTE:
In this case, it is not necessary to inspect DTC P0301, P0302, P0303 and P0304.
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2.CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM connector and chassis ground on faulty cylinders.
Connector & terminal
#1 (B134) No. 17 (+) — Chassis ground (−):
#2 (B134) No. 16 (+) — Chassis ground (−):
#3 (B134) No. 27 (+) — Chassis ground (−):
#4 (B134) No. 26 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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3.CHECK HARNESS BETWEEN FUEL INJECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector on faulty cylinders.
3) Measure the resistance between ECM connector and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 1 — Engine ground:
#2 (E16) No. 1 — Engine ground:
#3 (E6) No. 1 — Engine ground:
#4 (E17) No. 1 — Engine ground:
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Is the resistance 1 MΩ or more?
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Repair the ground short circuit of harness between fuel injector and ECM connector.
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4.CHECK HARNESS BETWEEN FUEL INJECTOR AND ECM CONNECTOR.
Measure the resistance of harness connector between ECM connector and fuel injector on faulty cylinders.
Connector & terminal
#1 (B134) No. 17 — (E5) No. 1:
#2 (B134) No. 16 — (E16) No. 1:
#3 (B134) No. 27 — (E6) No. 1:
#4 (B134) No. 26 — (E17) No. 1:
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Is the resistance less than 1 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM and fuel injector connector
• Poor contact of coupling connector
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5.CHECK FUEL INJECTOR.
Measure the resistance between fuel injector terminals on faulty cylinder.
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Is the resistance between 5 — 20 Ω?
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Replace the faulty fuel injector.
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6.CHECK POWER SUPPLY LINE.
1) Turn the ignition switch to ON.
2) Measure the voltage between fuel injector and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (−):
#2 (E16) No. 2 (+) — Engine ground (−):
#3 (E6) No. 2 (+) — Engine ground (−):
#4 (E17) No. 2 (+) — Engine ground (−):
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Is the voltage 10 V or more?
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Repair the poor contact of all connectors in fuel injector circuit.
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit in harness between main relay and fuel injector connector on faulty cylinders
• Poor contact of coupling connector
• Poor contact of main relay connector
• Poor contact of fuel injector connector on faulty cylinders
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7.CHECK HARNESS BETWEEN FUEL INJECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector on faulty cylinders.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connector and chassis ground on faulty cylinders.
Connector & terminal
#1 (B134) No. 17 (+) — Chassis ground (−):
#2 (B134) No. 16 (+) — Chassis ground (−):
#3 (B134) No. 27 (+) — Chassis ground (−):
#4 (B134) No. 26 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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Repair the short to power supply in harness between ECM connector and fuel injector. After repair, replace the ECM.
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8.CHECK FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between fuel injector terminals on faulty cylinder.
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Is the resistance less than 1 Ω?
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Replace the faulty fuel injector and ECM.
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9.CHECK INSTALLATION OF CAMSHAFT POSITION SENSOR/CRANKSHAFT POSITION SENSOR.
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Is the camshaft position sensor or crankshaft position sensor loosely installed?
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Tighten the camshaft position sensor or crankshaft position sensor.
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10.CHECK CRANK SPROCKET.
Remove the timing belt cover.
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Is the crank sprocket rusted or does it have broken teeth?
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Replace the crank sprocket.
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11.CHECK INSTALLATION CONDITION OF TIMING BELT.
Turn the crankshaft using ST, and align the alignment mark on crank sprocket with alignment mark on cylinder block.
| ST 499987500 |
CRANKSHAFT SOCKET |
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Is the timing belt dislocated from its proper position?
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Repair the installation condition of timing belt.
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Is the fuel meter indication higher than the “Lower” level?
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Replenish fuel so fuel meter indication is higher than the “Lower” level. After refueling,
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13.CHECK STATUS OF MALFUNCTION INDICATOR LIGHT.
1) Clear the memory using Subaru Select Monitor.
2) Start the engine, and drive the vehicle 10 minutes or more.
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Does the malfunction indicator light illuminate or blink?
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14.CHECK CAUSE OF MISFIRE.
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Has the cause of misfire been detected while running the engine?
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Finish diagnostics operation, if the engine has no abnormality.
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Repair the poor contact.
NOTE:
In this case, repair the following item:
• Poor contact of ignition coil connector
• Poor contact of fuel injector connector on faulty cylinders
• Poor contact in ECM connector
• Poor contact of coupling connector
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15.CHECK AIR INTAKE SYSTEM.
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Is there any fault in air intake system?
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Repair the air intake system.
NOTE:
Check the following items.
• Are there air leaks or air suction caused by loose or dislocated nuts and bolts?
• Are there cracks or any disconnection of hoses?
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Is there any fault in the cylinder?
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Repair or replace faulty parts.
NOTE:
Check the following items.
• Spark plug
• Fuel injector
• Compression ratio
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Go to DTC P0171.
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