Function Inspection

(Refer to COOLING SYSTEM (FA20) )

(Refer to LUBRICATION SYSTEM (FA20) )

(Refer to ON-VEHICLE INSPECTION )

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

1. Remove the fan & generator V belt from 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 fan & generator V belt.

1. Warm up the engine and stop.
2. Connect the SSM3 to the DLC.
3. Start the engine.
4. According to the procedure shown on the display, display the [Data monitor]→[Ignition timing adv. #1] screen to measure the ignition timing.

   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. Inspection with SSM3
   1. Connect the SSM3 to the DLC.
   2. Start the engine.
   3. According to the procedure shown on the display, display the [Data monitor] screen to measure the engine speed.
   STANDARD VALUE
   
   

   Transmission	Idle speed
   A/T	600 to 800 r/min
   M/T	550 to 750 r/min

   CAUTION:

   Perform this measurement with all accessory switches OFF, A/C OFF, electric fan OFF and shift position N or P.

1. Check the diagnosis code (Refer to CHECKING/CLEARING DTC ).
2. Remove the relay block cover UPR.
3. Remove the fuel pump fuse from the engine compartment relay block.
   Fig 1: Identifying Engine Compartment Relay Block Fuel Pump Fuse

   Courtesy of SUBARU OF AMERICA, INC.
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.
   Fig 2: Setting Compression Gauge And Compression Gauge Attachment

   Courtesy of SUBARU OF AMERICA, INC.
9. Install the injector driver. (Refer to INSTALLATION )
10. Fully open the throttle.
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 rpm 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 REMOVAL )
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 the normal code is output.

1. Start the engine.
2. Maintain the engine speed at 2500 rpm for approximately 180 seconds.
3. Insert a CO/HC meter testing probe at least 40 cm {15.7in} into the tailpipe during idling.
4. Immediately check the CO/HC concentration at idle and/or 2500 rpm.
   NOTE:

   • When performing the 2 mode (2500 rpm 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 (Refer to UNIT INSPECTION ) and heated oxygen sensor (Refer to UNIT INSPECTION ) operation.
   2. Refer to the table below for the possible cause, and then inspect and correct the applicable causes if necessary.

   CO	HC	Trouble	Probable cause
   Normal	High	Rough idling	Weak ignition Defective timing Faulty plug gap Intake/exhaust leakage Cylinder compression leakage
   Low	High	Rough idling (HC unstable)	Vacuum leakage PCV hose Intake manifold Throttle body Misfire due to lean fuel mixture
   High	High	Rough idling (black smoke)	Clogged air cleaner element Clogged PCV valve Faulty EFI system Faulty pressure regulator Faulty engine coolant sensor Faulty air flow meter Faulty ECM Faulty injector Faulty throttle position sensor