Fuel Injection System (Except Wrx): Diagnosis — Fuel Injection System (Except Wrx) — Fuel System

OTHER INSPECTIONS

Check that the throttle body has no deformation, cracks or other damages.
Check that the preheater hose has no cracks, damage or loose part.

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Release the fuel pressure. < Refer to «RELEASING OF FUEL PRESSURE»(ref-560357-S36338281542013061300000) , PROCEDURE, Fuel. >
Disconnect the ground cable from battery.
Open the fuel filler lid and remove the fuel filler cap.
Lift up the vehicle.
Remove the under cover. < Refer to «REMOVAL»(ref-560372-S42274069342013061300000) , Front Under Cover. >
Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. < Refer to «DRAINING OF ENGINE COOLANT»(ref-560359-S12749968242013061300000) , REPLACEMENT, Engine Coolant. >
Remove the clip (A) from the air intake boot.
Loosen the clamp (B) connecting the air intake boot and air cleaner case (rear).
Loosen the clamp (C) which connects the air intake boot and throttle body.
Remove the air intake boot from the throttle body, and move it to the left side wheel apron.
Disconnect the preheater hose from throttle body.
Disconnect the connector (A) from the purge control solenoid valve.
Loosen the bolt (B) which secures the EGR pipe to the intake manifold.
Remove the nut (C) which holds EGR pipe from the water pipe assembly.
Disconnect the PCV hose (A) from intake manifold.
Disconnect the connector (B) from manifold absolute pressure sensor.
Disconnect the connector (C) from the throttle position sensor.
Disconnect the brake booster vacuum hose from the intake manifold.
Disconnect the connector (A) from the mass air flow and intake air temperature sensor, and remove the clip (B) which holds the mass air flow and intake air temperature sensor harness.
Remove the air cleaner case (rear).
Remove the intake manifold protector RH.
Disconnect the fuel delivery pipe from the fuel pipe RH. NOTE: Disconnect the quick connector as shown in the figure.
Remove the intake manifold protector LH.
Disconnect the fuel delivery pipe from the fuel pipe LH. NOTE: Disconnect the quick connector as shown in the figure.
Disconnect the fuel delivery hose (A) and evaporation hose (B). 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 (A). ST 42099AE000 QUICK CONNECTOR RELEASE Remove the clip and disconnect the evaporation hose (B) from the evaporation pipe.
Remove the intake manifold from the tumble generator valve assembly.
Disconnect the connector from the engine, and then remove the engine harness. NOTE: Refer to "COMPONENT" of "General Description" for how to disconnect the engine harness connectors. < Refer to «ENGINE HARNESS»(ref-560357-S02628333482013061300000) , COMPONENT, General Description. >

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Connect the connectors to the engine, and install the engine harness. NOTE: Refer to "COMPONENT" of "General Description" for how to connect the engine harness connectors. < Refer to «ENGINE HARNESS»(ref-560357-S02628333482013061300000) , COMPONENT, General Description. > Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
Install the intake manifold to the tumble generator valve assembly. NOTE: Use a new gasket. Tightening torque: 8.3 N.m (0.8 kgf-m, 6.1 ft-lb)
Connect the fuel delivery hose (A) and evaporation hose (B).
Connect the fuel delivery pipe to the fuel pipe LH. CAUTION: Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe. When connecting the quick connector, make sure to insert the pipe all the way in before locking the slider. When it is difficult to lock the slider, check that the pipe is fully inserted. Make sure that the quick connector is securely connected. NOTE: Connect the quick connector as shown in the figure.
Install the intake manifold protector LH. Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
Connect the fuel delivery pipe to the fuel pipe RH. CAUTION: Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe. When connecting the quick connector, make sure to insert the pipe all the way in before locking the slider. When it is difficult to lock the slider, check that the pipe is fully inserted. Make sure that the quick connector is securely connected. NOTE: Connect the quick connector as shown in the figure.
Install the intake manifold protector RH. Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
Install the air intake case (rear).
Install the clip (B) which secures the air flow and intake air temperature sensor harness, and connect the connector (A) to the air flow and intake air temperature sensor.
Connect the brake booster vacuum hose to the intake manifold.
Connect the PCV hose (A) to intake manifold.
Connect the connector (B) to the manifold absolute pressure sensor.
Connect the connector (C) to the throttle position sensor.
Connect the connector (A) to the purge control solenoid valve.
Tighten the nut (C) and bolt (B) which hold EGR pipe to the water pipe assembly. NOTE: Use a new gasket. Always tighten the EGR pipe at (C) first, and then (B). Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
Install the preheater hose to the throttle body.
Install the air intake boot. < Refer to «INSTALLATION»(ref-560358-S35284385082013061300000) , Air Intake Boot. >
Lift up the vehicle.
Install the under cover. < Refer to «INSTALLATION»(ref-560372-S19308806142013061300000) , Front Under Cover. >
Lower the vehicle.
Connect the battery ground terminal.
Fill engine coolant. < Refer to «FILLING OF ENGINE COOLANT»(ref-560359-S08077404332013061300000) , REPLACEMENT, Engine Coolant. >

Scheme 65

Scheme 65: DISASSEMBLY

Scheme 66

Scheme 67

Scheme 68

Remove the throttle body. < Refer to «REMOVAL»(ref-560357-S30105897582013061300000) , Throttle Body. >
Remove the purge control solenoid valve. < Refer to «REMOVAL»(ref-560374-S23255621492013061300000) , Purge Control Solenoid Valve. >
Remove the manifold absolute pressure sensor. < Refer to «REMOVAL»(ref-560357-S14228228742013061300000) , Manifold Absolute Pressure Sensor. >
Remove the EGR pipe from intake manifold.
Remove the fuel delivery pipe from intake manifold. NOTE: Disconnect the quick connector as shown in the figure.
Remove the fuel pipe and cap from the intake manifold.

Scheme 69

Install the fuel pipe and cap to the intake manifold. Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
Install the fuel delivery pipe to the intake manifold. CAUTION: Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe. When connecting the quick connector, make sure to insert the pipe all the way in before locking the slider. When it is difficult to lock the slider, check that the pipe is fully inserted. Make sure that the quick connector is securely connected. NOTE: Connect the quick connector as shown in the figure.
Temporarily install the EGR pipe to the intake manifold. NOTE: Use a new gasket. Tighten the EGR pipe when installing the intake manifold.
Install the manifold absolute pressure sensor. < Refer to «INSTALLATION»(ref-560357-S13967144212013061300000) , Manifold Absolute Pressure Sensor. >
Install the purge control solenoid valve. < Refer to «INSTALLATION»(ref-560374-S01708166202013061300000) , Purge Control Solenoid Valve. >
Install the throttle body. < Refer to «INSTALLATION»(ref-560357-S32837124262013061300000) , Throttle Body. >

INSPECTION

Check that the intake manifold and fuel pipe have no deformation, cracks and other damages.
Check that the hose has no cracks, damage or loose part.

Scheme 70

Disconnect the ground cable from battery.
Drain engine coolant. < Refer to «DRAINING OF ENGINE COOLANT»(ref-560359-S12749968242013061300000) , REPLACEMENT, Engine Coolant. >
Disconnect the connector (A) from the engine coolant temperature sensor, and remove the engine coolant temperature sensor.

Check that the crankshaft position sensor has no deformation, cracks or other damages.

Check that the crankshaft position sensor plate has no deformation, cracks or other damages.

Scheme 71

Scheme 72

Disconnect the ground cable from battery.
Remove the air intake duct. (RH side only) < Refer to «REMOVAL»(ref-560358-S09391633272013061300000) , Air Intake Duct. >
Disconnect the connector (A) from the camshaft position sensor, and remove the camshaft position sensor from the chain cover. RH side LH side

Scheme 73

Scheme 74

Disconnect the ground cable from battery.
Remove the under cover. < Refer to «REMOVAL»(ref-560372-S42274069342013061300000) , Front Under Cover. >
Disconnect the connector (A) from the camshaft position sensor, and remove the camshaft position sensor from the chain cover. RH side LH side

Check that the camshaft position sensor has no deformation, cracks or other damages.

Scheme 75

Scheme 76

Disconnect the ground cable from battery.
Remove the air intake duct. (RH side only) < Refer to «REMOVAL»(ref-560358-S09391633272013061300000) , Air Intake Duct. >
Remove the reservoir tank. (LH side only) < Refer to «REMOVAL»(ref-560359-S08575096822013061300000) , Reservoir Tank. >
Disconnect the connector (A) from the oil control solenoid, and remove the oil control solenoid from the chain cover. RH side LH side

Scheme 77

Scheme 78

Disconnect the ground cable from battery.
Remove the air intake duct. (RH side only) < Refer to «REMOVAL»(ref-560358-S09391633272013061300000) , Air Intake Duct. >
Remove the reservoir tank. (LH side only) < Refer to «REMOVAL»(ref-560359-S08575096822013061300000) , Reservoir Tank. >
Disconnect the connector (A) from the oil control solenoid, and remove the oil control solenoid from the chain cover. RH side LH side

Check that the oil control solenoid has no deformation, cracks or other damages.
Measure the resistance between the oil control solenoid terminals. Terminal No. Standard 1 and 2 7.25±0.4 ohms (when 20°C (68°F))

Scheme 79

Disconnect the ground cable from battery.
Remove the clip (A) from the air intake boot.
Loosen the clamp (B) connecting the air intake boot and air cleaner case (rear).
Loosen the clamp (C) which connects the air intake boot and throttle body.
Remove the air intake boot from the throttle body, and move the air intake boot to the left side wheel apron.
Disconnect the connector (A) from the knock sensor, and remove the knock sensor from the cylinder block.

Scheme 80

Scheme 80: INSTALLATION

Scheme 81

Install the knock sensor to the cylinder block. NOTE: The knock sensor should be installed so that the center of the connector is positioned at a 76.5 - 91.5° angle relative to the front of engine. Tightening torque: 24 N.m (2.4 kgf-m, 17.7 ft-lb)
Connect the connector to the knock sensor.
Install the air intake boot. < Refer to «INSTALLATION»(ref-560358-S35284385082013061300000) , Air Intake Boot. >
Connect the battery ground terminal.

Check that the knock sensor has no deformation, cracks or other damages.
Measure the resistance between knock sensor terminals. Terminal No. Standard 1 and 2 560±28 kohms

Check that the mass air flow and intake air temperature sensor has no deformation, cracks or other damages.
Check that the mass air flow and intake air temperature sensor has no dirt.

Scheme 82

Disconnect the ground cable from battery.
Disconnect the connector (A) from the manifold absolute pressure sensor, and remove the manifold absolute pressure sensor from intake manifold.

For inspection procedures of EGR control valve, refer to the "EC(H4DO)" section. < Refer to INSPECTION , EGR Control Valve. >

Scheme 83

Scheme 84

Release the fuel pressure. < Refer to «RELEASING OF FUEL PRESSURE»(ref-560357-S36338281542013061300000) , PROCEDURE, Fuel. >
Disconnect the ground cable from battery.
Open the fuel filler lid and remove the fuel filler cap.
Remove the clip (A) from the air intake boot. (RH side only)
Loosen the clamp (B) connecting the air intake boot and air cleaner case (rear). (RH side only)
Loosen the clamp (C) which connects the air intake boot and throttle body. (RH side only)
Remove the air intake boot from the throttle body, and move the air intake boot to the left side wheel apron. (RH side only)
Disconnect the connector (A) from the mass air flow and intake air temperature sensor, and remove the clip (B) which holds the mass air flow and intake air temperature sensor harness. (RH side only)
Remove the air cleaner case (rear). (RH side only)
Remove the intake manifold protector. LH side RH side
Disconnect the connectors (A) from fuel injector.
Remove the bolts which hold fuel pipe onto the cam carrier.
Remove the fuel injector.

Check that the fuel injector has no deformation, cracks or other damages.
Measure the resistance between fuel injector terminals. Terminal No. Standard 1 and 2 Approx. 12.0 ohms (when 20°C (68°F))

Scheme 85

Scheme 86

Scheme 87

Release the fuel pressure. < Refer to «RELEASING OF FUEL PRESSURE»(ref-560357-S36338281542013061300000) , PROCEDURE, Fuel. >
Disconnect the ground cable from battery.
Open the fuel filler lid and remove the fuel filler cap.
Remove the intake manifold. < Refer to «REMOVAL»(ref-560357-S21824144702013061300000) , Intake Manifold. >
Disconnect the connector (A) from the tumble generator valve assembly.
Remove the tumble generator valve assembly from the cylinder head. LH side RH side
Remove the cylinder head plate from cylinder head.

Check that the tumble generator valve assembly has no deformation, cracks or other damages.
Check tumble generator valve assembly for contamination or clogging.

Scheme 88

Scheme 89

Disconnect the ground cable from battery.
Disconnect the connector (A) from tumble generator valve assembly, and remove the tumble generator valve actuator. LH side RH side

Check that the tumble generator valve actuator has no deformation, cracks or other damages.
Check tumble generator valve actuator for contamination or clogging.

Scheme 90

Scheme 91

Disconnect the ground cable from battery.
Remove the radiator sub fan. < Refer to «REMOVAL»(ref-560359-S37328944852013061300000) , Radiator Sub Fan and Fan Motor. >
Lift up the vehicle.
Remove the under cover. < Refer to «REMOVAL»(ref-560372-S42274069342013061300000) , Front Under Cover. >
Disconnect the front oxygen (A/F) sensor connector, and remove the clip holding the front oxygen (A/F) sensor harness.
Lower the vehicle.
Apply spray-type lubricant to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
Remove the front oxygen (A/F) sensor. CAUTION: When removing the front oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.

Check that the rear oxygen sensor has no deformation, cracks or other damages.
Measure the resistance between rear oxygen sensor terminals. Terminal No. Standard 1 and 2 Approx. 5.6 ohms (when 20°C (68°F))

Scheme 92

Scheme 93

Scheme 94

Disconnect the ground cable from battery.
Remove the back panel - pocket. < Refer to «REMOVAL»(ref-560372-S02115546132013061300000) , Glove Box. >
Disconnect the connector from ECM.
Remove the harness clip, and push the tabs to remove the relay block.
Remove the bolts and nuts, and remove the ECM.

Check that the ECM has no deformation, cracks or other damages.

Scheme 95

Disconnect the ground cable from battery.
Remove the back panel - pocket. < Refer to «REMOVAL»(ref-560372-S02115546132013061300000) , Glove Box. >
Remove the main relay from the relay block on the back side of the glove box.

Check that the fuel pump relay has no deformation, cracks or other damages.
Measure the resistance between fuel pump relay terminals. Terminal No. Standard 1 and 2 1 Mohms or more 3 and 4 93.8 - 136.4 ohms (when 20°C (68°F))
Connect battery positive terminal to terminal No. 3 and battery ground terminal to terminal No. 4, and measure the resistance between the fuel pump relay terminals. Terminal No. Standard 1 and 2 Less than 1 ohms

Scheme 96

Scheme 97

Scheme 98

Disconnect the ground cable from battery.
Remove the knee airbag module. < Refer to «REMOVAL»(ref-560375-S20581140632013061300000) , Knee Airbag Module. >
Release the lock and remove the fuse holder from the relay & fuse box.
Disconnect the connectors from the relay & fuse box.
Remove the bolts (A) and nuts (B), and remove the relay & fuse box.
Remove the electronic throttle control relay from the relay block on the back side of the fuse block.

Check that the electronic throttle control relay has no deformation, cracks or other damages.
Measure the resistance between electronic throttle control relay terminals. Terminal No. Standard 1 and 2 1 Mohms or more 3 and 4 93.8 - 136.4 ohms (when 20°C (68°F))
Connect battery positive terminal to terminal No. 3 and battery ground terminal to terminal No. 4, and measure the resistance between the electronic throttle control relay terminals. Terminal No. Standard 1 and 2 Less than 1 ohms

Check that the fuel tank and fuel pipe have no deformation, cracks and other damages.
Check that the fuel hose has no cracks, damage or loose part.

Check that the fuel filler pipe assembly has no deformation, cracks or other damages.
Check that the fuel hose has no cracks, damage or loose part.

Check that the fuel pipe has no deformation, cracks or other damages.
Check that the hose and tube have no cracks, damage or loose part.

Trouble	Possible cause	Corrective action
Insufficient fuel supply to fuel injector	A. Fuel pump does not operate.
	O Defective terminal contact	Inspect contact, especially ground, and tighten it securely.
	O Trouble in electromagnetic or electronic circuit parts	Replace the faulty parts.
	B. Decline of fuel pump function	Replace the fuel pump.
	C. Clogged fuel filter	Replace the fuel filter. Clean or replace the fuel tank if necessary.
	D. Clogged or bent fuel line pipe, hose or tube	Clean, correct or replace the fuel line pipe, hose or tube.
	E. Air is mixed in fuel system.	Check the fuel line connections, correct or replace the defective part.
	F. Damaged diaphragm of pressure regulator	Replace the fuel filter assembly.
Leakage or blow out of fuel	A. Loose connections of fuel line pipe, hose or tube	Check the fuel line connections, correct or replace the defective part.
	B. Cracked fuel line pipe, hose or tube	Replace the fuel line pipe, hose or tube.
	C. Cracked fuel tank or defective welding part	Replace the fuel tank.
	D. Clogged or bent fuel line pipe, hose or tube	Clean, correct or replace the fuel line pipe, hose or tube.
Gasoline smell inside of compartment	A. Loose connections of fuel line pipe, hose or tube	Check the fuel line connections, correct or replace the defective part.
	B. Defective gasket of fuel saucer or fuel filler pipe assembly	Correct or replace the gasket.
	C. Defective canister	Replace the canister.
Defective fuel gauge	A. Defective operation of fuel level sensor	Replace the fuel level sensor.
	B. Defective operation of combination meter	Replace the combination meter.
	C. Defective operation of integrated unit	Replace the integrated unit.
Noise	A. Large operation noise or vibration of fuel pump	Replace the fuel pump.

Note. When the vehicle is left unattended for an extended period of time, water may accumulate in the fuel tank. Fill fuel fully to prevent the problem. In snow-covered areas, mountainous areas, skiing areas, etc. where ambient temperatures drop to 0°C (32°F) or less throughout the winter season, use a water removing agent in the fuel system to prevent freezing fuel system and accumulating water. When water is accumulated in fuel filter, fill the water removing agent in the fuel tank. Before using water removing agent, follow the cautions noted on the bottle.

Fuel Injection System (Except Wrx): Diagnosis Subaru XV GP