ignition timing check SUZUKI SX4 2006 1.G Service Workshop Manual

Downloaded from www.Manualslib.com manuals search engine Table of Contents 1- i
1
Section 1
CONTENTS
Engine
Precautions ................................................. 1-1
Precautions............................................................. 1-1
Precautions for Engine .......................................... 1-1
Engine General Information and
Diagnosis ................................................. 1A-1
Precautions........................................................... 1A-1
Precautions on Engine Service ........................... 1A-1
Precaution on On-Board Diagnostic (OBD)
System .............................................................. 1A-1
Precautions in Diagnosing Trouble ..................... 1A-1
Precautions for DTC Troubleshooting ................. 1A-2
Precautions of ECM Circuit Inspection................ 1A-2
Precautions of Electric Throttle Body System
Calibration ......................................................... 1A-2
Precaution on CAN Troubleshooting .................. 1A-3
General Description ............................................. 1A-5
Statement on Cleanliness and Care ................... 1A-5
Engine Diagnosis General Description ............... 1A-5
On-Board Diagnostic System Description ........... 1A-5
Data Link Connector (DLC) ................................. 1A-8
Engine and Emission Control System
Description ........................................................ 1A-8
CAN Communication System Description........... 1A-9
Air Intake System Description ........................... 1A-11
Description of Electric Throttle Body System
Calibration ....................................................... 1A-11
Description of Electric Throttle Body System .... 1A-11
Engine and Emission Control Input / Output
Table ............................................................... 1A-18
Schematic and Routing Diagram ...................... 1A-19
Engine and Emission Control System
Diagram .......................................................... 1A-19
Component Location ......................................... 1A-21
Electronic Control System Components
Location .......................................................... 1A-21
Diagnostic Information and Procedures .......... 1A-22
Engine and Emission Control System Check.... 1A-22
Malfunction Indicator Lamp (MIL) Check .......... 1A-25
DTC Check ....................................................... 1A-25
DTC Clearance ................................................. 1A-26
Troubleshooting for Communication Error
with Scan Tool Using CAN.............................. 1A-26
DTC Table ......................................................... 1A-32For Vehicle Equipped with A/T .......................... 1A-36
Fail-Safe Table .................................................. 1A-36
Scan Tool Data ................................................. 1A-38
Visual Inspection ............................................... 1A-43
Engine Basic Inspection .................................... 1A-43
Engine Symptom Diagnosis .............................. 1A-45
Malfunction Indicator Lamp Does Not Come
ON with Ignition Switch ON and Engine Stop
(but Engine Can Be Started) ........................... 1A-52
Malfunction Indicator Lamp Remains ON after
Engine Starts................................................... 1A-54
DTC P0010: Camshaft Position Actuator
Circuit (for engine with VVT system) ............... 1A-55
DTC P0011 / P0012: Camshaft Position -
Timing Over-Advanced or System
Performance / Retarded (for engine with
VVT system).................................................... 1A-57
DTC P0031 / P0032: HO2S Heater Control
Circuit Low / High (Sensor-1) .......................... 1A-59
DTC P0037 / P0038: HO2S Heater Control
Circuit Low / High (Sensor-2) .......................... 1A-61
DTC P0101: Mass Air Flow Circuit Range /
Performance.................................................... 1A-63
DTC P0102: Mass Air Flow Circuit Low Input ... 1A-66
DTC P0103: Mass Air Flow Circuit High Input .. 1A-67
DTC P0106: Manifold Absolute Pressure
Range / Performance ...................................... 1A-69
DTC P0107: Manifold Absolute Pressure
Circuit Low Input ............................................. 1A-70
DTC P0108: Manifold Absolute Pressure
Circuit High Input............................................. 1A-72
DTC P0111: Intake Air Temperature Circuit
Range / Performance ...................................... 1A-74
DTC P0112: Intake Air Temperature Sensor
Circuit Low ...................................................... 1A-76
DTC P0113: Intake Air Temperature Sensor
Circuit High...................................................... 1A-78
DTC P0116: Engine Coolant Temperature
Circuit Range / Performance ........................... 1A-80
DTC P0117: Engine Coolant Temperature
Circuit Low ...................................................... 1A-83
DTC P0118: Engine Coolant Temperature
Circuit High...................................................... 1A-85
DTC P0122: Throttle Position Sensor (Main)
Circuit Low ...................................................... 1A-87

Downloaded from www.Manualslib.com manuals search engine Table of Contents 1-v
Diagnostic Information and Procedures ............ 1H-4
Ignition System Symptom Diagnosis................... 1H-4
Reference Waveform of Ignition System............. 1H-4
Ignition System Check ........................................ 1H-4
Ignition Spark Test .............................................. 1H-6
Repair Instructions .............................................. 1H-6
High-Tension Cord Removal and Installation...... 1H-6
High-Tension Cord Inspection ............................ 1H-7
Spark Plug Removal and Installation .................. 1H-7
Spark Plug Inspection ......................................... 1H-7
Ignition Coil Assembly (Including Ignitor)
Removal and Installation................................... 1H-8
Ignition Coil Assembly (Including Ignitor)
Inspection.......................................................... 1H-8
Ignition Timing Inspection ................................... 1H-8
Specifications..................................................... 1H-10
Tightening Torque Specifications ...................... 1H-10
Special Tools and Equipment ........................... 1H-10
Special Tool ...................................................... 1H-10
Starting System ......................................... 1I-1
Schematic and Routing Diagram ......................... 1I-1
Cranking System Circuit Diagram ........................ 1I-1
Diagnostic Information and Procedures ............. 1I-1
Cranking System Symptom Diagnosis ................. 1I-1
Cranking System Test.......................................... 1I-3
Repair Instructions ............................................... 1I-4
Starting Motor Dismounting and Remounting ...... 1I-4
Starting Motor Components ................................. 1I-5
Starting Motor Inspection ..................................... 1I-6
Specifications........................................................ 1I-9
Cranking System Specifications........................... 1I-9
Tightening Torque Specifications ......................... 1I-9
Special Tools and Equipment.............................. 1I-9
Recommended Service Material .......................... 1I-9
Charging System ...................................... 1J-1
General Description ............................................. 1J-1
Battery Description .............................................. 1J-1
Generator Description ......................................... 1J-3
Diagnostic Information and Procedures ............ 1J-4
Battery Inspection ............................................... 1J-4
Generator Symptom Diagnosis ........................... 1J-4
Generator Test (Undercharged Battery
Check) ............................................................... 1J-5
Generator Test (Overcharged Battery Check) .... 1J-6
Repair Instructions .............................................. 1J-6
Jump Starting in Case of Emergency.................. 1J-6
Battery Dismounting and Remounting ................ 1J-7
Water Pump / Generator Drive Belt Tension
Inspection and Adjustment ................................ 1J-7
Water Pump / Generator Drive Belt Removal
and Installation .................................................. 1J-8
Generator Dismounting and Remounting............ 1J-9
Generator Components..................................... 1J-10
Generator Inspection......................................... 1J-11
Specifications ..................................................... 1J-13
Charging System Specifications ....................... 1J-13
Tightening Torque Specifications ...................... 1J-13
Exhaust System ....................................... 1K-1
General Description .............................................1K-1
Exhaust System Description ............................... 1K-1
Diagnostic Information and Procedures ............1K-1
Exhaust System Check ....................................... 1K-1
Repair Instructions ..............................................1K-2
Exhaust System Components ............................. 1K-2
Exhaust Manifold Removal and Installation ........ 1K-3
Exhaust Pipe and Muffler Removal and
Installation ......................................................... 1K-4
Specifications .......................................................1K-5
Tightening Torque Specifications ........................ 1K-5

Downloaded from www.Manualslib.com manuals search engine 1A-38 Engine General Information and Diagnosis:
Scan Tool DataS6RW0D1104007
As the data values are standard values estimated on the basis of values obtained from the normally operating vehicles
by using a scan tool, use them as reference values. Even when the vehicle is in good condition, there may be cases
where the checked value does not fall within each specified data range. Therefore, judgment as abnormal should not
be made by checking with these data alone.
Also, conditions that can be checked by the scan tool are those detected by ECM and output from ECM as commands
and there may be cases where the engine or actuator is not operating (in the condition) as indicated by the scan tool.
Be sure to use the timing light to check the ignition timing.
NOTE
• There are two types of OBD system depending on the vehicle specification.
For identification, refer to “Precaution on On-Board Diagnostic (OBD) System”.
• With the CAN communication generic scan tool, only star (*) marked data in the following table can
be read.
• When checking the data with the engine running at idle or racing, be sure to shift M/T gear to the
neutral position and A/T gear to the “Park” position and pull the parking brake fully. Also, if nothing
or “no load” is indicated, turn OFF A/C (if equipped with A/C), all electric loads, P/S and all the other
necessary switches.

Scan tool data Vehicle conditionNormal condition /
reference values
*) COOLANT TEMP
(ENGINE COOLANT TEMP.)At specified idle speed after warming up 80 – 100 °C, 176 – 212 °F
*) INTAKE AIR TEMP. At specified idle speed after warming up–5 °C (23 °F) + environmental
temp. to 40 °C (104 °F) +
environmental temp.
*) ENGINE SPEED It idling with no load after warming up Desired idle speed ± 50 rpm
) DESIRED IDLE
(DESIRED IDLE SPEED)It idling with radiator cooling fan stopped and all
electrical parts turned OFF after warming up, M/T at
neutral700 rpm
*) MAF
(MASS AIR FLOW RATE)At specified idle speed with no load after warming up1.0 – 4.0 g/s 0.14 – 0.52 lb/
min.
At 2500 r/min. with no load after warming up4.0 – 9.0 g/s 0.53 – 1.58 lb/
min.
*) CALC LOAD
(CALCULATED LOAD
VA L U E )At specified idle speed with no load after warming up 16 – 36%
At 2500 r/min. with no load after warming up 10 – 30%
*) MAP
(INTAKE MANIFOLD
ABSOLUTE PRESSURE) (if
equipped)At specified idle speed with no load after warming up 24 – 38 kPa, 7.1 – 11.2 in.Hg
*) THROTTLE POSITION
(RELATIVE THROTTLE
POSITION)Ignition switch ON /
warmed up engine
stoppedAccelerator pedal released 0 – 12%
Accelerator pedal depressed
fully90 – 100%
*) BAROMETRIC PRES —Barometric pressure is
displayed
) FUEL TANK LEVEL Ignition switch ON 0 – 100%
*) BATTERY VOLTAGE Ignition switch ON / engine at stop 10 – 14 V
) BRAKE SWITCH Ignition switch ONBrake pedal is released OFF
Brake pedal is depressed ON
*) FUEL SYSTEM B1
(FUEL SYSTEM STATUS)At specified idle speed after warming up CLSD (closed loop)
*) O2S B1 S1
(HEATED OXYGEN
SENSOR-1)At specified idle speed after warming up 0.1 – 0.95 V
*)
O2S B1 S2
(HEATED OXYGEN
SENSOR-2) (if equipped)At 2000 r/min. for 3 min. or longer after warming up 0.1 – 0.95 V

Downloaded from www.Manualslib.com manuals search engine 1A-42 Engine General Information and Diagnosis:
CANIST PRG DUTY (EVAP CANISTER PURGE FLOW
DUTY, %)
This parameter indicates valve ON (valve open) time
rate within a certain set cycle of EVAP canister purge
valve which controls the amount of EVAP purge.
IGNITION ADVANCE (IGNITION TIMING ADVANCE
FOR NO.1 CYLINDER, °)
Ignition timing of No.1 cylinder is commanded by ECM.
The actual ignition timing should be checked by using
the timing light.
EGR VALVE OPENING (%)
This parameter indicates opening rate of EGR valve
which controls the amount of EGR flow.
VVT GAP (TARGET-ACTUAL POSITION, °) (VVT
model)
It is calculated using the formula: target valve timing
advance – actual valve timing advance.
FUEL PUMP (ON/OFF)
ON is displayed when ECM activates the fuel pump via
the fuel pump relay switch.
STARTER SW (STARTER SWITCH, ON/OFF)
This parameter indicates condition of starting motor relay
output.
ON: Starting motor relay is ON
OFF: Starting motor relay is OFF
A/C PRESSURE (A/C REFRIGERANT ABSOLUTE
PRESSURE, kPa)
This parameter indicates A/C refrigerant absolute
pressure calculated by ECM.
A/C SWITCH (ON/OFF)
ON: Command for A/C operation being output from ECM
to HVAC.
OFF: Command for A/C operation not being output.
A/C COMP RELAY (A/C COMPRESSOR RELAY, ON/
OFF)
This parameter indicates the state of the A/C switch.
BLOWER FAN (ON/OFF)
This parameter indicates the state of the blower fan
motor switch.
ELECTRIC LOAD (ON/OFF)
ON: Headlight or small light ON signal inputted.
OFF: Above electric loads all turned OFF.
RADIATOR COOLING FAN (RADIATOR COOLING
FAN CONTROL RELAY, ON/OFF)
ON: Command for radiator cooling fan control relay
operation being output.
OFF: Command for relay operation not being output.A/C COND FAN (A/C CONDENSER COOLING FAN
CONTROL RELAY, ON/OFF)
ON: Command for A/C condenser cooling fan control
relay operation being output.
OFF: Command for relay operation not being output.
TP SENSOR 1 VOLT (THROTTLE POSITION SENSOR
(MAIN) OUTPUT VOLTAGE, V)
The Throttle Position Sensor (Main) reading provides
throttle valve opening information in the form of voltage.
TP SENSOR 2 VOLT (THROTTLE POSITION SENSOR
(SUB) OUTPUT VOLTAGE, V)
The Throttle Position Sensor (Sub) reading provides
throttle valve opening information in the form of voltage.
APP SENSOR 1 VOLT (ACCELERATOR PEDAL
POSITION (APP) SENSOR (MAIN) OUTPUT
VOLTAGE, V)
The Accelerator Pedal Position (APP) Sensor (Main)
reading provides accelerator pedal opening information
in the form of voltage.
APP SENSOR 2 VOLT (ACCELERATOR PEDAL
POSITION (APP) SENSOR (SUB) OUTPUT VOLTAGE,
V)
The Accelerator Pedal Position (APP) Sensor (Sub)
reading provides accelerator pedal opening information
in the form of voltage.
ACCEL POSITION (RELATIVE ACCELERATOR
PEDAL POSITION, %)
When accelerator pedal is at fully released position,
accelerator pedal is indicated as 0 – 3% and 90 – 100%
fully depressed position.
TARGET THROTTLE POSI (TARGET THROTTLE
VALVE POSITION, %)
Target Throttle Valve Position is ECM internal parameter
which indicates the ECM requested throttle valve
position.
IAC THROTTLE OPENING (IDLE AIR (SPEED)
CONTROL THROTTLE VALVE OPENING, %)
This parameter indicates throttle valve opening of idle air
control in %.
(100% indicates the maximum idle air flow.)
THROTTLE MOTOR VOLT (V)
This parameter indicates power supply voltage of throttle
actuator (motor) control circuit (input voltage from
throttle actuator control relay).
CLOSED THROTTLE POS (CLOSED THROTTLE
POSITION, ON/OFF)
This parameter reads ON when throttle valve is fully
closed, or OFF when it is not fully closed.

Downloaded from www.Manualslib.com manuals search engine 1A-44 Engine General Information and Diagnosis:
4Check keyless start control system malfunction
1) Check keyless start control system referring to “Keyless
Start System Operation Inspection in Section 10E”.
Is check result satisfactory?Go to Step 5. Keyless start control
system malfunction.
5Is engine cranked?Go to Step 6. Go to “Cranking System
Symptom Diagnosis in
Section 1I”.
6Does engine start?Go to Step 7. Go to Step 9.
7Check idle speed
1) Check engine idle speed referring to “Idle Speed and
IAC Throttle Valve Opening Inspection”.
Is check result as specified?Go to Step 8. Go to “Engine Symptom
Diagnosis”.
8Check ignition timing
1) Check ignition timing referring to “Ignition Timing
Inspection in Section 1H”.
Is check result as specified?Go to “Engine Symptom
Diagnosis”.Check ignition control
related parts referring to
“Ignition Timing
Inspection in Section
1H”.
9Check immobilizer system malfunction
1) Check immobilizer indicator lamp for flashing.
Is it flashing when ignition switch is turned to ON position?Go to “DTC Check in
Section 10C”.Go to Step 10.
10Check fuel supply
1) Check to make sure that enough fuel is filled in fuel tank.
2) Turn ON ignition switch for 2 seconds and then OFF.
3) Repeat Step 2) a few times.
Is fuel pressure felt from fuel feed hose when ignition switch
is turned ON?Go to Step 12. Go to Step 11.
11Check fuel pump for operation
Was fuel pump operating sound heard from fuel filler for
about 2 seconds after ignition switch ON and stop?Go to “Fuel Pressure
Check”.Go to “Fuel Pump and
Its Circuit Check”.
12Check ignition spark
1) Check ignition spark referring to “Ignition Spark Test in
Section 1H”.
Is it in good condition?Go to Step 13. Go to “Ignition System
Symptom Diagnosis in
Section 1H”.
13Check fuel injector circuit
1) Check fuel injector circuit referring to “Fuel Injector
Circuit Check.”
Is it in good condition?Go to “Engine Symptom
Diagnosis”.Go to “Fuel Injector
Circuit Check”. Step Action Yes No
I5RW0A110014-01

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-51
Excessive hydrocarbon
(HC) emission or carbon
monoxide (CO)Faulty spark plug“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty ignition coil with ignitor“Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H”
Low compression“Compression Check in Section 1D”
Lead contamination of three way
catalytic converterCheck for absence of filler neck restrictor.
Faulty evaporative emission control
system“EVAP Canister Purge Inspection in Section
1B”
Fuel pressure out of specification“Fuel Pressure Check”
Closed loop system (A/F feedback
compensation) fails (Poor performance
of ECT sensor or MAF sensor)“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Engine not at normal operating
temperature
Clogged air cleaner“Air Cleaner Filter Inspection and Cleaning in
Section 1D”
Vacuum leaks“Engine Vacuum Check in Section 1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Excessive nitrogen
oxides (NOx) emissionImproper ignition timing“Ignition Timing Inspection in Section 1H”
Lead contamination of catalytic
converterCheck for absence of filler neck restrictor.
Faulty EGR system“EGR System Inspection (If Equipped) in
Section 1B”
Fuel pressure out of specification“Fuel Pressure Check”
Closed loop system (A/F feedback
compensation) fails (Poor performance
of ECT sensor or MAF sensor)“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D” Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-57
DTC P0011 / P0012: Camshaft Position - Timing Over-Advanced or System Performance / Retarded
(for engine with VVT system)
S6RW0D1104014
System Description
Actual value of advanced valve timing does not reach target value.
Valve timing is advanced although ECM command is most retarding.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
WARNING!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and tester, on a level road.

NOTE
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Altitude (barometric pressure): 2500 m, 8200 ft or less (560 mmHg, 74.4 kPa or more)

1) Clear DTC. Refer to “DTC Clearance”.
2) Start engine and drive vehicle under usual driving condition for 5 minutes or longer until engine is warmed up to
normal operating temperature.
3) Stop vehicle.
4) Run engine at idle speed for 1 minute.
5) Start vehicle and increase vehicle speed up to 120 km/h (70 mile/h).
6) Keep vehicle speed at 120 km/h (70 mile/h) for 1 minute or longer at 5th gear position or D range.
7) Decrease vehicle speed gradually.
8) Stop vehicle and turn OFF ignition switch.
9) Repeat Step 4) to 7) one time.
10) Stop vehicle.
11) Check DTC. Refer to “DTC Check”.9Oil control valve check
Check oil control valve referring to “Oil Control Valve
Inspection (For Engine with VVT) in Section 1D”.
Is resistance within specified value?Substitute a known-
good ECM and recheck.Faulty oil control valve. Step Action Yes No
DTC detecting condition Trouble area
Actual value of advanced valve timing does not reach
target value, or valve timing is advanced although ECM
command is most retarding.
(2 driving cycle detection logic)• Oil control valve
• Oil galleries of timing sprocket
• Intake camshaft timing sprocket (Camshaft position
control (VVT) actuator)
• Oil control valve circuit
•ECM

Downloaded from www.Manualslib.com manuals search engine 1A-58 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Do you have SUZUKI scan tool?Go to Step 3. Go to Step 5.
3Camshaft position control check
1) With ignition switch turned OFF, connect SUZUKI scan
tool.
2) Start engine and warm up to normal operating
temperature.
3) Select menu to “Data List”.
4) Check that “VVT GAP” displayed on SUZUKI scan tool is
0 – 3°.
Is it OK?Go to Step 4. Check valve timing
referring to “Timing
Chain and Chain
Tensioner Removal and
Installation in Section
1D”. If OK, go to Step 5.
4Camshaft position control check
1) Drive vehicle under following conditions.
• Vehicle speed at 80 km/h (50 mile/h).
• Gear position at 5th or D range.
2) Check that “VVT GAP” displayed on SUZUKI scan tool is
0 – 5°.
Is it OK?Substitute a known-
good ECM and recheck.Go to Step 5.
5Oil control circuit visual inspection
1) Remove cylinder head cover referring to “Cylinder Head
Cover Removal and Installation in Section 1D”.
2) Check oil pressure leakage from oil control circuit.
Is it in good condition?Go to Step 6. Repair or replace.
6Oil control valve and oil gallery pipe check
1) Remove oil control valve referring to “Oil Control Valve
Removal and Installation (For Engine with VVT) in
Section 1D”.
2) Remove oil gallery pipe referring to “Timing Chain Cover
Removal and Installation in Section 1D”.
3) Check oil gallery pipe and oil control valve for clog or
sludge.
Are they in good condition?Go to Step 7. Clean oil control valve
and oil gallery pipe.
Replace oil control valve
if a problem is not
solved after cleaning oil
control valve and oil
gallery pipe.
7Oil control valve electrical circuit check
1) Check that oil control valve circuit is in good condition
referring to “DTC P0010: Camshaft Position Actuator
Circuit (for engine with VVT system)”.
Is circuit in good condition?Repair circuit. Go to Step 8.
8Oil control valve check
1) Check oil control valve referring to “Oil Control Valve
Inspection (For Engine with VVT) in Section 1D”.
Is it in good condition?Replace camshaft
timing sprocket.Replace oil control
valve.

Downloaded from www.Manualslib.com manuals search engine 1A-110 Engine General Information and Diagnosis:
DTC P0300 / P0301 / P0302 / P0303 / P0304: Random Misfire Detected / Cylinder 1 / Cylinder 2 /
Cylinder 3 / Cylinder 4 Misfire Detected
S6RW0D1104039
System Description
ECM measures the angle of the crankshaft based on the pulse signal from the CKP sensor and CMP sensor for each
cylinder. If it detects a large change in the angle speed of the crankshaft, it concludes occurrence of a misfire. When
the number of misfire is counted by ECM beyond the DTC detecting condition, it determines the cylinder where the
misfire occurred and output it as DTC.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
WARNING!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.

NOTE
Check to make sure that following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temp.: –7 °C, 19.4 °F or more
• Engine coolant temp.: –10 °C, 14 °F or more
• Altitude (barometric pressure): 2500 m, 8200 ft or less (560 mmHg, 74.4 kPa or more)

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and print Freeze Frame Data or write them down using scan tool.
3) Clear DTC using scan tool.
4) Drive vehicle under freeze frame data condition as noted for 1 min. or more.
5) Stop vehicle and check DTC and pending DTC.DTC detecting condition Trouble area
DTC P0300:
• Misfire, which causes catalyst to overheat during 200 engine revolutions, is detected
at 2 or more cylinders. (MIL flashes as long as this misfire occurs continuously.)
or
• Misfire, which affects exhaust emission adversely during 1000 engine revolution, is
detected at 2 or more cylinders. (2 driving cycle detection logic)• Ignition system
• Fuel injector and its circuit
• Fuel pressure
• EGR system
• Abnormal air drawn in
• Engine compression
• Valve lash adjuster
• Valve timing
• Fuel shortage
• Exhaust system
• Fuel of poor quality DTC P0301, P0302, P0303, P0304:
• Misfire, which causes catalyst to overheat during 200 engine revolutions, is detected
at 1 cylinder. (MIL flashes as long as this misfire occurs continuously.)
or
• Misfire, which affects exhaust emission adversely during 1000 engine revolution, is
detected at 1 cylinder. (2 driving cycle detection logic)

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-111
DTC Troubleshooting
NOTE
If the vehicle runs under fuel deficient condition (such as a condition in which the fuel pump is unable
to draw fuel properly), DTC of misfire may possibly be detected due to fuel pressure drop even though
there is no abnormal condition existing in the Engine and Emission System.
Therefore, if the DTC still cannot be detected with “Trouble Symptom Confirmation” executed in
accordance with “Engine and Emission Control System Check” the possible cause may be due to a
running condition under insufficient fuel supply at the time of detecting DTC of misfire.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Does fuel level meter indicate “E” level (empty)?Add fuel and recheck. Go to Step 3.
3Fuel quality check
1) Check that there is fuel of good quality in the fuel tank.
Is it OK?Go to Step 4. Clean in fuel system
circuit and change fuel.
4Ignition system check
1) Check spark plug and ignition spark of cylinder where
misfire occurs, referring to “Spark Plug Inspection in
Section 1H” and “Ignition Spark Test in Section 1H”.
Are they in good condition?Go to Step 5. Faulty ignition coil, wire
harness, spark plug or
other system parts.
5Fuel injector circuit check
1) Using sound scope, check each injector operating sound
at engine cranking or idling.
Do all injectors make operating sound?Go to Step 6. Check coupler
connection and wire
harness of injector not
making operating sound
and injector itself. If OK,
substitute a known-
good ECM and recheck.
6Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure Check”.
Is check result satisfactory?Go to Step 7. Repair or replace fuel
system.
7Fuel injector check
1) Check fuel injector(s) referring to “Fuel Injector
Inspection in Section 1G”.
Is check result satisfactory?Go to Step 8. Replace defective
injector.
8Ignition timing check
1) Check ignition timing referring to “Ignition Timing
Inspection in Section 1H”.
Is check result satisfactory?Go to Step 9. Check related sensors.
9EGR system check
1) Check EGR system referring to “EGR System Inspection
(If Equipped) in Section 1B”.
Is check result satisfactory?Go to Step 10. Repair or replace EGR
system.
10Exhaust system check
1) Check exhaust system for exhaust gas clogged.
Is it OK?Go to Step 11. Repair clogged of
exhaust system.