camshaft SUBARU FORESTER 2004 Service Manual Online
[x] Cancel search | Manufacturer: SUBARU, Model Year: 2004, Model line: FORESTER, Model: SUBARU FORESTER 2004Pages: 2870, PDF Size: 38.67 MB
Page 1641 of 2870
EN(H4DOTC)-11
ENGINE (DIAGNOSTIC)
Electrical Component Location
SENSOR
(1) Manifold absolute pressure sensor (4) Knock sensor (7) Mass air flow and intake air tem-
perature sensor
(2) Engine coolant temperature sen-
sor(5) Camshaft position sensor
(6) Crankshaft position sensor (8) Tumble generator valve position
sensor (3) Throttle position sensor
EN-00293
(1)
(7) (6) (4) (8) (5)(2)
(3)
Page 1653 of 2870
EN(H4DOTC)-23
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)
Crank-
shaft posi-
tion sensorSignal (+) B135 10 0−7 — +7 Waveform
Signal (−) B135 22 0 0 —
Shield B135 31 0 0 —
Camshaft
position
sensorSignal (+) B135 11 0−7 — +7 Waveform
Signal (−) B135 23 0 0 —
Shield B135 31 0 0 —
Throttle
position
sensorSignal B136 18Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7—
Pow er
supplyB136 16 5 5 —
GND
(sensors)B136 35 0 0 —
Rear Oxy-
gen Sen-
sorSignal B137 25 0 0 — 0.9 —
Shield B137 31 0 0 —
GND
(sensors)B136 35 0 0 —
Fr o nt ox y-
gen (A/F)
sensor
heaterSignal 1 B134 3 0 — 1.0 0 — 1.0 Waveform
Signal 2 B134 2 0 — 1.0 0 — 1.0 Waveform
Rear oxygen sensor
heater signalB135 2 0 — 1.0 0 — 1.0 Waveform
Engine
coolant
tempera-
ture sen-
sorSignal B136 14 1.0 — 1.4 1.0 — 1.4 After engine is warmed-up.
GND
(sensors)B136 35 0 0 After engine is warmed-up.
Vehicle speed signal B135 26 0 or 5 0 or 5“5” and “0” are repeatedly dis-
played when vehicle is driven.
EN-02308
B134
34
3330 31 3229 26
27
28 25
1
2
8 9 310
11 12
19 20 21 13 14
15
16 17
18 22 23 24
3330 31 32
29 26
27
28 25
7
8 9 5 64
10
11 12
19 20 21 13 14
15 16
17
18 22
23 241
2 3
7 5 64
3534
B137 B135
B136
33
30 31
32
29 26
27
28 25
8 910
11 12
19
20 21 13 14
15 16 17
18
22
23 241
2
3
75 64
3534
30 3129
26
27
28 25
8 910
11 12
19 20 21 13 14
15 16 17
18 22
23 241 2
3
75 64
Page 1654 of 2870
EN(H4DOTC)-24
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
AV C S
camshaft
position
sensor RHSignal (+) B135 21 0−7 — +7 Waveform
Signal (−) B135 29 0 0 —
Shield B135 30 0 0 —
AV C S
camshaft
position
sensor LHSignal (+) B135 20 0−7 — +7 Waveform
Signal (−) B135 28 0 0 —
Shield B135 30 0 0 —
Generator signal B134 22ON: 1, or less
OFF: 10 — 13ON: 1, or less
OFF: 10 — 13Wavefor m
Air flow
sensorSignal B136 23 — 0.3 — 4.5 —
Shield B136 32 0 0 —
GND B136 31 0 0 —
Intake air temperature
sensor signalB136 13 0.3 — 4.6 0.3 — 4.6 —
Exhaust
gas tem-
perature
sensorSignal B136 24 — — —
GND
(sensor)B136 35 0 0 —
Tu m b l e
generator
valve posi-
tion sen-
sor RHSignal B136 27Fully closed: 3.8 — 4.9
Fully opened: 0.2 — 0.9—
Pow er
supplyB136 16 5 5 —
GND
(sensor)B136 35 0 0 —
Tu m b l e
generator
valve posi-
tion sen-
sor LHSignal B136 26Fully closed: 3.8 — 4.9
Fully opened: 0.2 — 0.9—
Pow er
supplyB136 16 5 5 —
GND
(sensor)B136 35 0 0 —
Tumble generator valve
RH (open)B134 9 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
RH (close)B134 8 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
LH (open)B134 11 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
LH (close)B134 10 0 or 10 — 13 0 or 13 — 14 Waveform
Wastegate control sole-
noid valveB134 32 0 or 10 — 13 0 or 13 — 14 —
Starter switch B137 8 0 0 Cranking: 8 — 14
A/C switch B137 17ON: 10 — 13
OFF: 0ON: 13 — 14
OFF: 0—
Ignition switch B137 14 10 — 13 13 — 14 —
Neutral Position Switch B137 9ON: 12±0.5
OFF: 0Switch is ON when gear is in
neutral position.
Test Mode Connector B137 15 10 — 13 13 — 14 When connected: 0
Knock
sensorSignal B136 25 2.8 2.8 —
Shield B136 33 0 0 —
Back-up power supply B135 19 10 — 13 13 — 14 Ignition switch “OFF”: 10 — 13
Control module power
supplyB135 5 10 — 13 13 — 14 —
B135 6 10 — 13 13 — 14 — DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)
Page 1665 of 2870
EN(H4DOTC)-35
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
5. READ CURRENT DATA FOR ENGINE (OBD MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» display screen, select the {OBD System} and press the [YES] key.
5) On the «OBD Menu» screen, select the {Current Data Display/Save}, and then press the [YES] key.
6) On the «Data Display Menu» screen, select the {Data Display} and press the [YES] key.
7) Using the scroll key, move the display screen up or down until the desired data is shown.
A list of the support data is shown in the following table.
Air conditioning signal A/C Compressor Signal ON or OFF
Radiator main fan relay signal Radiator Fan Relay #1 ON or OFF
Knocking signal Knocking Signal ON or OFF
Radiator sub fan relay signal Radiator Fan Relay #2 ON or OFF
Power steering switch signal P/S Switch ON or OFF
Engine torque control permission signal Torque Permission Signal ON or OFF
Rear oxygen sensor rich signal Rear Oxygen Rich Signal ON or OFF
Starter switch signal Starter Switch ON or OFF
Idle switch signal Idle Switch ON or OFF
Crankshaft position sensor signal Crankshaft Position Sig. ON or OFF
Camshaft position sensor signal Camshaft Position Sig. ON or OFF
Rear defogger switch signal Rear Defogger SW ON or OFF
Blower fan switch signal Blower Fan SW ON or OFF
Small light switch signal Light Switch ON or OFF
Tumble generated valve output signal TGV Output ON or OFF
Exhaust temperature signal Exhaust Gas Temperature°C
Estimated cumulative driving distance Odd Meter km
Roughness Monitor for #1 cylinder Roughness Monitor #1 —
Roughness Monitor for #2 cylinder Roughness Monitor #2 —
Roughness Monitor for #3 cylinder Roughness Monitor #3 —
Roughness Monitor for #4 cylinder Roughness Monitor #4 —
Wiper switch signal Wiper Switch ON or OFF
A/C middle pressure switch signal A/C Mid pressure switch ON or OFF
AT retard angle demand signal Retard Signal from AT ON or OFF
AT fuel cut demand signal Fuel Cut Signal from AT ON or OFF
Description Display Unit of measure
Number of diagnosis code Number of Diag. Code —
Condition of malfunction indicator light MI (MIL) ON or OFF
Monitoring test of misfire Misfire monitoring Complete or incomplete
Monitoring test of fuel system Fuel system monitoring Complete or incomplete
Monitoring test of comprehensive component Component monitoring Complete or incomplete
Test of catalyst Catalyst Diagnosis Complete or incomplete
Test of heating-type catalyst Heated catalyst No support
Test of evaporative emission purge control system Evaporative purge system No support
Test of secondary air system Secondary air system No support
Test of air conditioning system refrigerant A/C system refrigerant No support
Test of oxygen sensor Oxygen sensor Complete or incomplete
Test of oxygen sensor heater Oxygen Heater Diagnosis Complete or incomplete
Test of EGR system EGR system No supportRemarks Display Unit of measure
Page 1667 of 2870
![SUBARU FORESTER 2004 Service Manual Online EN(H4DOTC)-37
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
7. LED OPERATION MODE FOR ENGINE
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «Sys](/img/17/57426/w960_57426-1666.png "SUBARU FORESTER 2004 Service Manual Online EN(H4DOTC)-37
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
7. LED OPERATION MODE FOR ENGINE
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «Sys")
EN(H4DOTC)-37
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
7. LED OPERATION MODE FOR ENGINE
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» screen, select the {Current Data Display/Save}, and then press the [YES] key.
5) On the «Data Display» screen, select the {Data & LED Display} and press the [YES] key.
6) Using the scroll key, move the display screen up or down until the desired data is shown.
A list of the support data is shown in the following table.
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
Description Display Message LED “ON” requirements
Ignition switch signal Ignition Switch ON or OFF When ignition switch is ON.
Test mode connector signal Test Mode Signal ON or OFF When test mode connector is connected.
Neutral position switch signal Neutral Position Switch ON or OFF When neutral position signal is entered.
Air conditioning switch signal A/C Switch ON or OFF When air conditioning switch is ON.
Air conditioning relay signal A/C Compressor Signal ON or OFF When air conditioning relay is in function.
Radiator main fan relay signal Radiator Fan Relay #1 ON or OFF When radiator main fan relay is in function.
Knocking signal Knocking Signal ON or OFF When knocking signal is input.
Radiator sub fan relay signal Radiator Fan Relay #2 ON or OFF When radiator sub fan relay is in function.
Engine torque control permission
signalTorque Control Permission ON or OFFWhen engine torque control permission sig-
nal is entered.
Rear oxygen sensor rich signalRear O
2 Rich Signal
ON or OFFWhen rear oxygen sensor mixture ratio is
rich.
Starter switch signal Starter Switch ON or OFF When starter switch signal is entered.
Idle switch signal Idle Switch ON or OFF When idle switch signal is entered.
Crankshaft position sensor signal Crankshaft Position Signal ON or OFFWhen crankshaft position sensor signal is
input.
Camshaft position sensor signal Camshaft Position Signal ON or OFFWhen camshaft position sensor signal is
entered.
Power steering switch signal P/S Switch ON or OFF When power steering switch is entered.
Rear defogger switch signal Rear Defogger Switch ON or OFF When rear defogger switch is ON.
Blower fan switch signal Blower Fan Switch ON or OFF When blower fan switch is ON.
Light switch signal Light Switch ON or OFF When small light switch is ON.
Wiper switch signal Wiper Switch ON or OFF When wiper switch is ON.
A/C middle pressure switch signal A/C Mid Pressure Switch ON or OFF When A/C switch is ON.
AT retard angle demand signal Retard Signal from AT ON or OFF When AT retard angle demand signal exists.
AT fuel cut demand signal Fuel Cut Signal from AT ON or OFF When AT fuel cut demand signal exists.
AT/MT identification signal AT Vehicle ID Signal ON or OFF For AT model
Tumble generated valve actuator
signalTGV Output ON or OFF When TGV actuator signal is output.
Tumble generated valve drive sig-
nalTGV DriveOPEN or
CLOSEWhen TGV moves and valve opens.
Page 1670 of 2870
EN(H4DOTC)-40
ENGINE (DIAGNOSTIC)
Inspection Mode
12.Inspection Mode
A: OPERATION
Perform the diagnosis on the “Diagnosis Trouble Codes (DTC) List” below.
Refer to the item of drive cycle when perform the diagnosis not on the “Diagnosis Trouble Codes (DTC) List”
below.
DTC Item On condition
P0011 A Camshaft Position-Timing Over-Advanced or System Performance (Bank 1) —
P0021 A Camshaft Position-Timing Over-Advanced or System Performance (Bank 2) —
P0031 HO2S Sensor Circuit Low Voltage (Bank 1 Sensor 1) —
P0032 HO2S Sensor Circuit High Voltage (Bank 1 Sensor 1) —
P0037 HO2S Sensor Circuit Low Voltage (Bank 1 Sensor 2) —
P0038 HO2S Sensor Circuit High Voltage (Bank 1 Sensor 2) —
P0102 Mass or Volume Air Flow Circuit Low Input —
P0103 Mass or Volume Air Flow Circuit High Input —
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input —
P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input —
P0112 Intake Air Temperature Circuit Low Input —
P0113 Manifold Absolute Pressure/Barometric Pressure Circuit High Input —
P0117 Engine Coolant Temperature Circuit Low Input —
P0118 Engine Coolant Temperature Circuit High Input —
P0122 Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input —
P0123 Throttle/Pedal Position Sensor/Switch “A” Circuit High Input —
P0129 Barometric Pressure Too Low —
P0130 O
2 Sensor Circuit (Bank 1 Sensor 1) —
P0131 O
2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) —
P0132 O
2 Sensor Circuit High Voltage (Bank 1 Sensor 1) —
P0134 O
2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) —
P0137 O
2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) —
P0138 O
2 Sensor Circuit High Voltage (Bank 1 Sensor 2) —
P0171 System Too Lean (Bank 1) —
P0172 System Too Rich (Bank 1) —
P0230 Fuel Pump Primary Circuit —
P0245 Turbo/Super Charger Wastegate Solenoid “A” Low —
P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) —
P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) —
P0335 Crankshaft Position Sensor “A” Circuit —
P0336 Crankshaft Position Sensor “A” Circuit Range/Performance —
P0340 Camshaft Position Sensor “A” Circuit (Bank 1 or Single Sensor) —
P0341Camshaft Position Sensor “A” Circuit Range/Performance (Bank 1 or Single
Sensor)—
P0365 Camshaft Position Sensor “B” Circuit (Bank 1) —
P0390 Camshaft Position Sensor “B” Circuit (Bank 2) —
P0458 Evaporative Emission Control System Purge Control Valve Circuit Low —
P0462 Fuel Level Sensor Circuit Low Input —
P0463 Fuel Level Sensor Circuit High Input —
P0502 Vehicle Speed Sensor Circuit Low Input —
P0503 Vehicle Speed Sensor Intermittent/Erratic/High —
P0509 Idle Control System Circuit High —
P0512 Starter Request Circuit—
P0513 Incorrect Immobilizer Key —
P0519 Idle Control System Malfunction (Fail-Safe) —
Page 1704 of 2870
EN(H4DOTC)-74
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
18.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC Item NOTE
P0011 A Camshaft Position-Timing Over-
Advanced or System Performance
(Bank 1)
Procedure with Diagnostic Trouble Code (DTC).>
P0021 A Camshaft Position-Timing Over-
Advanced or System Performance
(Bank 2)
Procedure with Diagnostic Trouble Code (DTC).>
P0030 HO2S Heater Control Circuit (Bank
1 Sensor 1)
Code (DTC).>
P0031 HO2S Sensor Circuit Low Voltage
(Bank 1 Sensor 1)
Code (DTC).>
P0032 HO2S Sensor Circuit High Voltage
(Bank 1 Sensor 1)
Code (DTC).>
P0037 HO2S Sensor Circuit Low Voltage
(Bank 1 Sensor 2)
Code (DTC).>
P0038 HO2S Sensor Circuit High Voltage
(Bank 1 Sensor 2)
Code (DTC).>
P0068 Manifold Pressure Sensor Range/
Performance
Code (DTC).>
P0101 Mass or Volume Air Flow Circuit
Range/Performance
ble Code (DTC).>
P0102 Mass or Volume Air Flow Circuit
Low Input
(DTC).>
P0103 Mass or Volume Air Flow Circuit
High Input
(DTC).>
P0107 Manifold Absolute Pressure/Baro-
metric Pressure Circuit Low Input
cedure with Diagnostic Trouble Code (DTC).>
P0108 Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input
(DTC).>
P0111 Intake Air Temperature Circuit
Range/Performance
ble Code (DTC).>
P0112 Intake Air Temperature Circuit Low
Input
(DTC).>
P0113 Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input
(DTC).>
P0117 Engine Coolant Temperature Cir-
cuit Low Input
Code (DTC).>
P0118 Engine Coolant Temperature Cir-
cuit High Input
Code (DTC).>
Page 1706 of 2870
EN(H4DOTC)-76
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0304 Cylinder 4 Misfire Detected
P0327 Knock Sensor 1 Circuit Low Input
(Bank 1 or Single Sensor)
nostic Trouble Code (DTC).>
P0328 Knock Sensor 1 Circuit High Input
(Bank 1 or Single Sensor)
nostic Trouble Code (DTC).>
P0335 Crankshaft Position Sensor “A” Cir-
cuit
(DTC).>
P0336 Crankshaft Position Sensor “A” Cir-
cuit Range/Performance
Diagnostic Trouble Code (DTC).>
P0340 Camshaft Position Sensor “A” Cir-
cuit (Bank 1 or Single Sensor)
Diagnostic Trouble Code (DTC).>
P0341 Camshaft Position Sensor “A” Cir-
cuit Range/Performance (Bank 1 or
Single Sensor)
Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0365 Camshaft Position Sensor “B” Cir-
cuit (Bank 1)
(DTC).>
P0390 Camshaft Position Sensor “B” Cir-
cuit (Bank 2)
(DTC).>
P0420 Catalyst System Efficiency Below
Threshold (Bank 1)
Trouble Code (DTC).>
P0458 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit
Low
cedure with Diagnostic Trouble Code (DTC).>
P0459 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit
High
Procedure with Diagnostic Trouble Code (DTC).>
P0461 Fuel Level Sensor Circuit Range/
Performance
Code (DTC).>
P0462 Fuel Level Sensor Circuit Low
Input
P0463 Fuel Level Sensor Circuit High
Input
P0464 Fuel Level Sensor Circuit Intermit-
tent
(DTC).>
P0483 Cooling Fan Rationality Check
P0502 Vehicle Speed Sensor Circuit Low
Input
(DTC).>
P0503 Vehicle Speed Sensor Intermittent/
Erratic/High
(DTC).>
P0506 Idle Control System RPM Lower
Than Expected
Code (DTC).> DTC Item NOTE
Page 1713 of 2870
EN(H4DOTC)-80
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0011 “A” CAMSHAFT POSITION - TIMING OVER - ADVANCED OR
SYSTEM PERFORMANCE (BANK 1)
DTC DETECTING CONDITION:
Detect as soon as the malfunction occurs.
TROUBLE SYMPTOM:
Engine stalls.
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode
Step Check Yes No
1 CHECK DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”.
List of Diagnostic
Trouble Code
(DTC).>Go to step 2.
2 CHECK CURRENT DATA.
1) Start the engine and idle it.
2) Check the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or OBD-II general
scan tool.
N
OTE:
Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA SHOWN ON DIS-
PLAY FOR ENGINE”.
OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the AVCS system operating
angle approx. 0 degree and oil
flow control solenoid valve duty
output approx. 10%?A temporary poor
malfunction. Per-
for m the following
to clean oil routing.
Replace the
engine oil, and
then idle the
engine for 5 min-
utes and replace
the oil filter and
engine oil.Check the follow-
ing and repair or
replace it if neces-
sary.
Oil pipe (clog-
ging)
Oil flow con-
trol solenoid
valve (clogging
or dirt of oil
routing, spring
setting, clog-
ging of valve)
Intake cam-
shaft (dirt, dam-
age of
camshaft)
Timing belt
(alignment of
timing mark)
Page 1714 of 2870
EN(H4DOTC)-81
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
B: DTC P0021 “A” CAMSHAFT POSITION - TIMING OVER - ADVANCED OR
SYSTEM PERFORMANCE (BANK 2)
DTC DETECTING CONDITION:
Detect as soon as the malfunction occurs.
TROUBLE SYMPTOM:
Engine stalls.
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode
Step Check Yes No
1 CHECK DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”.
List of Diagnostic
Trouble Code
(DTC).>Go to step 2.
2 CHECK CURRENT DATA.
1) Start the engine and idle it.
2) Check the AVCS system operating angle
and oil flow control solenoid valve duty output
using Subaru Select Monitor or OBD-II general
scan tool.
NOTE:
Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA SHOWN ON DIS-
PLAY FOR ENGINE”.
OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the AVCS system operating
angle approx. 0 degree and oil
flow control solenoid valve duty
output approx. 10%?A temporary poor
malfunction. Per-
for m the following
to clean oil routing.
Replace the
engine oil, and
then idle the
engine for 5 min-
utes and replace
the oil filter and
engine oil.Check the follow-
ing and repair or
replace it if neces-
sary.
Engine oil
(amount, dirt)
Oil pipe (clog-
ging)
Oil flow con-
trol solenoid
valve (clogging
or dirt of oil
routing, spring
setting, clog-
ging of valve)
Intake cam-
shaft (dirt, dam-
age of
camshaft)
Timing belt
(alignment of
timing mark)