Engine Mechanical (Except Wrx): Diagnosis Subaru XV GP

INSPECTION

Scheme 53

Scheme 54

Scheme 55

1. After warming-up the engine, turn the ignition switch to OFF.
2. Make sure that the battery is fully charged.
3. Check the starter motor for satisfactory performance and operation.
4. Remove the fuse of fuel pump from main fuse box.
5. Start the engine and run it until it stalls.
6. After the engine stalls, crank it for five more seconds.
7. Turn the ignition switch to OFF.
8. Remove all spark plugs. < Refer to «REMOVAL»(ref-560355-S29418949092013061300000) , Spark Plug. >
9. Connect the battery ground terminal.
10. Install the compression gauge to the spark plug hole. NOTE: When using a screw-in type compression gauge, the screw should be less than 25 mm (0.98 in) long.
11. Turn the ignition switch to ON.
12. Fully open the throttle valve.
13. Crank the engine by starter motor and read the value when the needle of the compression gauge becomes stable. NOTE: Perform at least two measurements per cylinder, and make sure that the values are correct. If the compression pressure is out of standard, check or adjust the pistons, valves and cylinders. Compression (fully open throttle): Standard 1, 050 - 1, 400 kPa (11 - 14 kgf/cm 2 , 152 - 203 psi) Difference between cylinders 100 kPa (1 kgf/cm 2 , 14 psi) or less
14. After inspection, install the related parts in the reverse order of removal.

1. Before checking the idle speed, check the following item: Check the air cleaner element is free from clogging, ignition timing is correct, spark plugs are in good condition, and hoses are connected properly. Check the malfunction indicator light does not illuminate.
2. Warm up the engine.
3. Read the engine idle speed using Subaru Select Monitor. < Refer to «READ CURRENT DATA FOR ENGINE (NORMAL MODE)»(ref-560373-S14668176562013061300000) , OPERATION, Subaru Select Monitor. > NOTE: Idle speed cannot be adjusted manually, because the idle speed is automatically adjusted. If idle speed is out of standard, refer to the General Diagnosis Table under "Engine Control System". < Refer to «BASIC DIAGNOSTIC PROCEDURE»(ref-560373-S33918700262013061300000) . > Check the idle speed when no-loaded. (Headlight, heater fan, rear defroster, radiator fan, A/C and etc. are OFF) Idle speed (No load, and for CVT model, select lever in "P" or "N" range, for MT model, gear shift lever in neutral position.): Standard 650±50 rpm Check the idle speed when loaded. (Turn the A/C switch to ON and operate the compressor for at least one minute before inspection.) Idle speed (A/C on, and for CVT model, select lever in "P" or "N" range, for MT model, gear shift lever in neutral position.): Standard 800 - 900±50 rpm

1. Before checking the ignition timing, check the following item: Check the air cleaner element is free from clogging, spark plugs are in good condition, and hoses are connected properly. Check the malfunction indicator light does not illuminate.
2. Warm up the engine.
3. Read the ignition timing using Subaru Select Monitor. < Refer to «READ CURRENT DATA FOR ENGINE (NORMAL MODE)»(ref-560373-S14668176562013061300000) , OPERATION, Subaru Select Monitor. > NOTE: If ignition timing is out of standard, check the ignition control system. Refer to "Engine Control System". < Refer to «BASIC DIAGNOSTIC PROCEDURE»(ref-560373-S33918700262013061300000) . > Ignition timing [BTDC/rpm]: Standard 16°±10°/650

Scheme 56

Scheme 57

1. Warm up the engine.
2. Disconnect the brake booster vacuum hose from the intake manifold.
3. Connect the vacuum gauge to the intake manifold.
4. Keep the engine at idle speed and read the vacuum gauge indication. NOTE: Condition of engine inside can be diagnosed by observing the behavior of the vacuum gauge needle as described in table below. Intake manifold vacuum (at idling, A/C OFF): Standard -60.0 kPa (-450 mmHg, -17.72 inHg) or more Diagnosis of engine condition by inspection of intake manifold vacuum Vacuum gauge needle behavior Possible engine condition 1. Needle is steady but lower than standard value. This tendency becomes more evident as engine temperature rises. Leakage around intake manifold gasket, disconnection or damage of vacuum hose 2. Needle intermittently drops to position lower than standard value. Leakage around cylinder 3. Needle drops suddenly and intermittently from standard value. Sticky valve 4. When engine speed is gradually increased, needle begins to vibrate rapidly at certain speed, and then vibration increases as engine speed increases. Weak or broken valve springs 5. Needle vibrates above and below standard value in narrow range. Defective ignition system
5. After inspection, install the related parts in the reverse order of removal.

Scheme 58

1. Disconnect the ground cable from battery.
2. Remove the oil pressure switch. < Refer to «REMOVAL»(ref-560354-S16441789112013061300000) , Oil Pressure Switch. >
3. Install the oil pressure gauge to the chain cover.
4. Connect the battery ground terminal.
5. Start the engine, and check the oil pressure. NOTE: Standard value is based on an engine oil temperature of 80°C (176°F). If the oil pressure is out of specification, check oil pump, oil filter and lubrication line. < Refer to «INSPECTION»(ref-560354-S06146549112013061300000) , Engine Lubrication System Trouble in General. > If the oil pressure warning light is ON and oil pressure is within standard, check the oil pressure switch. < Refer to «INSPECTION»(ref-560354-S06146549112013061300000) , Engine Lubrication System Trouble in General. > Engine oil pressure: Standard 50 kPa (0.5 kgf/cm 2 , 7 psi) or more (at 600 rpm) 350 kPa (3.6 kgf/cm 2 , 51 psi) or more (at 6, 000 rpm)
6. After inspection, install the related parts in the reverse order of removal.

Scheme 59

Scheme 60

1. Release the fuel pressure. < Refer to «RELEASING OF FUEL PRESSURE»(ref-560357-S36338281542013061300000) , PROCEDURE, Fuel. >
2. Open the fuel filler lid and remove the fuel filler cap.
3. Disconnect the fuel delivery hose from the fuel delivery pipe, and connect the fuel pressure gauge. CAUTION: Be careful not to spill fuel. Catch the fuel from hoses using a container or cloth. Attach ST to the fuel delivery pipe and push ST in the direction of arrow mark to disconnect the quick connector of the fuel delivery hose. ST 42099AE000 QUICK CONNECTOR RELEASE Connect the fuel pressure gauge with ST1 and ST2. NOTE: ST1 is a SUBARU genuine part. ST1 42075AG690 FUEL HOSE ST2 18471AA000 FUEL PIPE ADAPTER
4. Start the engine.
5. Check the fuel pressure after warming up the engine. NOTE: The fuel pressure gauge registers 10 to 20 kPa (0.1 to 0.2 kgf/cm 2 , 1 to 3 psi) higher than standard values during high-altitude operations. Check or replace the fuel pump and fuel delivery line if the fuel pressure is out of the standard. Fuel pressure: Standard 340 - 400 kPa (3.5 - 4.1 kgf/cm 2 , 49 - 58 psi)
6. After inspection, install the related parts in the reverse order of removal.

1. Check that pipes, hoses, connectors and clamps are installed firmly.
2. Check the engine coolant is at specified level.
3. Check CVTF is at the specified level. (CVT model)
4. Start the engine and check for exhaust gas, engine coolant, leaks of fuel, etc. Also check for noise and vibrations.

Make sure that there are no cracks or other damages.

Scheme 61

1. After removing the engine from the vehicle body, attach the ST to the engine as shown in the figure. NOTE: When using a commercially sold engine stand, follow the instructions of engine stand used. Tightening torque: 35 N.m (3.6 kgf-m, 25.8 ft-lb) ST1 498457000 ENGINE STAND ADAPTER RH ST2 498457100 ENGINE STAND ADAPTER LH ST3 18362AA020 ADAPTER ST4 499817100 ENGINE STAND
2. The procedures described under each index are all connected and stated in order. The procedure for overhauling of the engine will be completed when you go through all steps in the process. Therefore, to conduct the particular procedure within the flow of a procedure, you need to go back and conduct the procedure described previously in order to do that particular procedure.

1. Check that the crank pulley has no deformation, cracks or other damages.
2. Inspect for oil leakage from the front oil seal. If there is an oil leak, replace the front oil seal with a new one. < Refer to «REMOVAL»(ref-560356-S33499382622013061300000) , Crank Pulley. >

Check that the chain cover does not have deformation, cracks and any other damage.

1. Check the timing chain, chain guide, chain tensioner lever and chain tensioner for deformation, cracks or other damages.
2. Check the chain guide and chain tensioner lever for abnormal wear.

Check the cam sprocket teeth for abnormal wear and scratches.

1. Check the crank sprocket teeth for abnormal wear and scratches.
2. Make sure there is no free play between crank sprocket and key.

Check that the rocker cover does not have deformation, cracks and any other damage.

Note. The "RANK" shown in the chart shows the possibilities of the cause of trouble in order from "Very often" to "Rarely". - Very often - Sometimes - Rarely