Function Inspection

1. Inspect the air cleaner filter element SUB-ASSY for dirt or clogging.

1. Remove the V-belt from the belt tensioner pulley.
2. Move the V-ribbed belt tensioner ASSY in the both rotational directions to check whether it is caught.
   NOTE: Replace the V-ribbed belt tensioner ASSY if faulty.
3. Install the V-belt.

1. Warm up the engine and stop.
2. Connect the SSM4 to the DLC.
3. Start the engine.
4. Use SSM4 to read the ignition timing. (Refer to DATA MONITOR/ACTIVE TEST ) Standard value: -5 to 10°CA BTDC
   CAUTION: Perform this measurement with all accessory switches OFF, A/C OFF, electric fan OFF and shift position N or P.
5. Check that the ignition timing advances promptly when the engine speed is increased.

1. Warm up the engine and stop.
2. Connect the SSM4 to the DLC.
3. Start the engine.
4. Read the engine speed using the SSM4. (Refer to DATA MONITOR/ACTIVE TEST )

Standard value

1. Check the diagnosis code (Refer to CHECKING/CLEARING DTC ).
2. Remove the relay block cover UPR.

   Courtesy of SUBARU OF AMERICA, INC.

3. Remove the fuel pump fuse from the engine compartment relay block.
4. Start the engine.
5. Turn the ignition to OFF after the engine stalls by itself.
6. Crank the engine once and check that it does not start.
7. Remove the four spark plugs. (Refer to REMOVAL )
8. Set the compression gauge and compression gauge attachment.

   Courtesy of SUBARU OF AMERICA, INC.

9. Install the injector driver. (Refer to INSTALLATION )
10. Fully open the accelerator pedal.
11. With the brake pedal depressed, crank the engine and measure the compression of each cylinder.

    Compression: 1150 to 1750 kPa {11. 7 to 17. 8 kgf/cm² } {167 to 254 psi}

    Difference between cylinders: 200 kPa {2. 0 kgf/cm² } {29 psi}

    CAUTION:

    • Perform compression inspection in a short period of time.
    • Use a fully charged battery to keep the engine speed at 250 r/min or more.
    NOTE: When the compression pressure is low, pour a small amount of engine oil into cylinders and measure the compression again.
    • When the compression increases, it is possible that the piston rings etc. are worn.
    • When the compression does not change, it is possible that the valve system is faulty.
12. Remove the injector driver. (Refer to INJECTOR DRIVER (FA20) )
13. Install the four spark plugs. (Refer to INSTALLATION )
14. Install the fuel pump fuse.
15. Install the relay block cover UPR.
16. Clear the diagnosis code (Refer to CHECKING/CLEARING DTC ).
    CAUTION: Be sure to clear the memory of diagnosis code once and then check that no DTCs are output.

1. Start the engine.
2. Maintain the engine speed at 2500 r/min for approximately 180 seconds.
3. Insert a CO/HC meter testing probe at least 40 cm {15. 7 in} into the tailpipe during idling.
4. Immediately check the CO/HC concentration at idle and/or 2500 r/min.
   NOTE:

   • When performing the 2 mode (2500 r/min and idle) test, follow the measurement order prescribed by the applicable local regulations.
   • If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
   1. Check the A/F sensor (See UNIT INSPECTION ) and heated oxygen sensor (See UNIT INSPECTION ) operation.
   2. Refer to the table below for the possible cause, and then inspect and correct the applicable causes if necessary.