SFI SYSTEM, Diagnostic DTC:P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308

DTC Code	DTC Name
P0300	Random / Multiple Cylinder Misfire Detected
P0301	Cylinder 1 Misfire Detected
P0302	Cylinder 2 Misfire Detected
P0303	Cylinder 3 Misfire Detected
P0304	Cylinder 4 Misfire Detected
P0305	Cylinder 5 Misfire Detected
P0306	Cylinder 6 Misfire Detected
P0307	Cylinder 7 Misfire Detected
P0308	Cylinder 8 Misfire Detected

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbons concentration levels can cause an increase in exhaust emission levels. High concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds.

If the misfire exceeds the threshold levels and may cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

DTC No.	DTC Detection Condition	Trouble Area
P0300	Simultaneous misfiring of several cylinders occurs and one of the following conditions below is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly for direct injection Fuel injector assembly for port injection Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing Valve clearance PCV valve and hose PCV hose connections Intake system ECM
P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308	Misfiring of specific cylinder occurs and one of the following conditions below is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly for direct injection Fuel injector assembly for port injection Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor Compression pressure Valve timing Valve clearance PCV valve and hose PCV hose connections Intake system ECM

DTC No.

DTC Detection Condition

Trouble Area

P0300

Simultaneous misfiring of several cylinders occurs and one of the following conditions below is detected (2 trip detection logic):

High temperature misfire occurs in three-way catalytic converter (MIL blinks)
Emission deterioration misfire occurs (MIL illuminates)

Open or short in engine wire harness
Connector connection
Vacuum hose connections
Ignition system
Fuel injector assembly for direct injection
Fuel injector assembly for port injection
Fuel pressure
Mass air flow meter sub-assembly
Engine coolant temperature sensor
Compression pressure
Valve timing
Valve clearance
PCV valve and hose
PCV hose connections
Intake system
ECM

P0301

P0302

P0303

P0304

P0305

P0306

P0307

P0308

Misfiring of specific cylinder occurs and one of the following conditions below is detected (2 trip detection logic):

High temperature misfire occurs in three-way catalytic converter (MIL blinks)
Emission deterioration misfire occurs (MIL illuminates)

Open or short in engine wire harness
Connector connection
Vacuum hose connections
Ignition system
Fuel injector assembly for direct injection
Fuel injector assembly for port injection
Fuel pressure
Mass air flow meter sub-assembly
Engine coolant temperature sensor
Compression pressure
Valve timing
Valve clearance
PCV valve and hose
PCV hose connections
Intake system
ECM

If DTCs that indicate misfires are set for different cylinders, but DTC P0300 is not set, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic):

Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfire count (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.
After the first 1000 crankshaft revolutions, an excessive misfire count (approximately 20 to 60 misfires per 1000 crankshaft revolutions) occurs 4 times in sequential crankshaft revolutions.

The ECM flashes the MIL and sets a DTC when either one of the following conditions, which could cause the three-way catalytic converter damage, is detected (2 trip detection logic):

In every 200 crankshaft revolutions at a high engine speed, the threshold misfire percentage is recorded once.
In every 200 crankshaft revolutions at a normal engine speed, the threshold misfire percentage is recorded 3 times.

CONFIRMATION DRIVING PATTERN

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Record the DTC(s) and freeze frame data.
Using the tester, switch the ECM from normal mode to check mode Click here.
Read the misfire counts of each cylinder (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count) with the engine in an idling condition. If any misfire count is displayed, skip the following confirmation driving pattern.

Drive the vehicle several times with the conditions, such as engine rpm and engine load, shown in Misfire RPM and Misfire Load in the Data List.

Tech Tips

In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, using the Misfire RPM and Misfire Load in the Data List.

Engine RPM	Duration
Idling	7.0 minutes or more
1000	4.0 minutes or more
2000	2.0 minutes or more
3000	1.5 minutes or more

Check whether misfires have occurred by checking DTCs and freeze frame data.

Tech Tips

Do not turn the engine switch off until the stored DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data will be erased.
Record the DTC(s), freeze frame data and misfire counts.
Turn the engine switch off and wait for at least 5 seconds.

INSPECTION PROCEDURE

Tech Tips

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem:

There was insufficient fuel in the tank.
Improper fuel is used.
The spark plugs have been contaminated.
The problem requires further diagnosis.

After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count).
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
For 8 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set.

In the event of DTC P0300 being present, perform the following operations:

Clear DTCs Click here.
Start the engine and conduct the confirmation driving pattern.
Read the misfire count of each cylinder or DTC(s) using the tester.
Repair the cylinder(s) that has a high misfiring count or is indicated by the DTC.
After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.

When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred only while warming up the engine.
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be detected.

PROCEDURE

CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

Result

Result	Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs are output	B

Tech Tips

If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308 are output, troubleshoot those DTCs first.

GO TO DTC CHART Click here

CHECK PCV HOSE (HOSE CONNECTIONS)

OK

PCV hose is connected correctly and is not damaged.

NG
REPAIR OR REPLACE PCV HOSE

OK
READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Enter the following menus: Powertrain / Engine / Data List / Misfire RPM and Misfire Load.
4. Read and note the Misfire RPM and Misfire Load values.
  
  Tech Tips
  
  The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.
NEXT

OK
PCV hose is connected correctly and is not damaged.

CHECK MISFIRE COUNT OF PORT INJECTION

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear DTCs Click here.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port. (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the tester: Powertrain / Engine / Data List / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

Move the shift lever to D.
Repeat procedure "A" to "B" above.

Monitor all of the misfire count values that are displayed on the tester.

Result

Misfire count	Proceed to
There are no misfire counts	A
1 or 2 cylinders have misfire counts	B
3 cylinders or more have misfire counts	B

CHECK MISFIRE COUNT Click here

CHECK MISFIRE COUNT OF DIRECT INJECTION

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear DTCs Click here.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the tester: Enter the following menus: Powertrain / Engine / Data List / Cylinder #1 Misfire Count Cylinder #8 Misfire Count.

If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

Move the shift lever to D.
Repeat procedure "A" to "B" above.

Monitor all of the misfire count values that are displayed on the tester.

Result

Misfire Count		Proceed to
Port	Direct	Proceed to
There are no misfire counts	1 or 2 cylinders have misfire counts	A
There are no misfire counts	3 cylinders or more have misfire counts	B
There are no misfire counts	There are no misfire counts	C

CHECK FUEL PRESSURE SENSOR Click here

CHECK MISFIRE COUNT Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Click here

CHECK MISFIRE COUNT

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear DTCs Click here.
Enter the following menus: Powertrain / Engine / Data List / Misfire RPM, Misfire Load, Cylinder #1 Misfire Count to Cylinder #8 Misfire Count and Injection Way.
Drive the vehicle with Misfire RPM and Misfire Load.

Monitor all of the misfire count values or DTCs and Injection Way displayed on the tester.

Result

Misfire count	Injection Way	Proceed to
There are no misfire counts	-	A
1 or 2 cylinders have misfire counts	Port or Either	B
3 cylinders or more have misfire counts	Port or Either	C
1 or 2 cylinders have misfire counts	Direct	D
3 cylinders or more have misfire counts	Direct	E

CHECK SPARK PLUG Click here

CHECK INTAKE SYSTEM Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) Click here

CHECK FUEL PRESSURE SENSOR Click here

CHECK FOR INTERMITTENT PROBLEMS Click here

CHECK MISFIRE COUNT

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear DTCs Click here.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the tester: Powertrain / Engine / Data List / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

Move the shift lever to D.
Repeat procedure "A" to "B" above.

Monitor all of the misfire count values that are displayed on the tester.

Result

Misfire Count		Proceed to
Port	Direct	Proceed to
1 or 2 cylinders have misfire counts	1 or 2 cylinders have misfire counts	A
3 cylinders or more have misfire counts	3 cylinders or more have misfire counts	B
1 or 2 cylinders have misfire counts	There are no misfire counts	C
3 cylinders or more have misfire counts	There are no misfire counts	D

CHECK INTAKE SYSTEM Click here

REPLACE INJECTOR ASSEMBLY (MALFUNCTIONING CYLINDER) Click here

CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Click here

CHECK SPARK PLUG
1. Inspect the spark plug Click here.
NG
REPLACE SPARK PLUG Click here

OK
CHECK FOR SPARK AND IGNITION
1. Remove the ignition coil assemblies.
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil.
4. Disconnect the 2 fuel delivery pipe connectors.
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
6. Attach the spark plug assembly to the cylinder head cover.
7. Crank the engine for less than 2 seconds and check the spark.
  
  OK
  
  Sparks jump across the electrode gap.
8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
9. Reconnect the 2 fuel delivery pipe connectors.
10. Reinstall the spark plugs.
11. Reinstall the ignition coil assemblies.
NG
CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

OK
CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
1. Measure the cylinder compression pressure of the misfiring cylinder Click here.
NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK
CHECK INTAKE SYSTEM
1. Check the intake system for vacuum leaks.
  
  OK
  
  No leaks in the intake system.
NG
REPAIR OR REPLACE INTAKE SYSTEM

OK
CHECK VALVE TIMING
1. Remove the cylinder head cover bank 1 and bank 2.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  OK
  
  Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head covers.
NG
ADJUST VALVE TIMING Click here

OK
CHECK VALVE CLEARANCE (MISFIRING CYLINDER)
1. Check the valve clearance Click here.
NG
ADJUST VALVE CLEARANCE Click here

OK
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) Click here.
NG
CHECK FUEL PUMP OPERATION Click here

OK

OK
Sparks jump across the electrode gap.

OK
No leaks in the intake system.

OK
Timing marks on camshaft timing gears are aligned as shown in the illustration.

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

Read the Data List twice, when the engine is both cold and warmed up.

Standard
With cold engine
Same as ambient air temperature.
With warm engine
Between 75°C and 95°C (167°F and 203°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING INTELLIGENT TESTER (MAF)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the tester on.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
6. Read MAF with the engine speed at 3000 rpm.
  
  Standard
  
  Between 17 g/sec. and 23 g/sec. (shift lever: N; A/C: Off).
NG
CHECK HARNESS AND CONNECTOR Click here

OK

REPLACE ECM Click here
CHECK INTAKE SYSTEM
1. Check the intake system for vacuum leaks.
  
  OK
  
  No leaks in the intake system.
NG
REPAIR OR REPLACE INTAKE SYSTEM

OK
CHECK VALVE TIMING
1. Remove the cylinder head cover bank 1 and bank 2.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  OK
  
  Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head covers.
NG
ADJUST VALVE TIMING Click here

OK
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) Click here.
NG
CHECK FUEL PUMP OPERATION Click here

OK

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

Read the Data List twice when the engine is both cold and warmed up.

Standard
With cold engine
Same as ambient air temperature.
With warm engine
Between 75°C and 95°C (167°F and 203°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING INTELLIGENT TESTER (MAF)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the tester on.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
6. Read MAF with the engine speed at 3000 rpm.
  
  Standard
  
  Between 17 g/sec. and 23 g/sec. (shift lever: N; A/C: Off).
NG
CHECK HARNESS AND CONNECTOR Click here

OK
CHECK SPARK PLUG
1. Inspect the spark plug Click here.
NG
REPLACE SPARK PLUG Click here

OK
CHECK FOR SPARK AND IGNITION
1. Remove the ignition coil assemblies.
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil.
4. Disconnect the 2 fuel delivery pipe connectors.
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
6. Attach the spark plug assembly to the cylinder head cover.
7. Crank the engine for less than 2 seconds and check the spark.
  
  OK
  
  Sparks jump across the electrode gap.
8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
9. Reconnect the 2 fuel delivery pipe connectors.
10. Reinstall the spark plugs.
11. Reinstall the ignition coil assemblies.
NG
CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

OK
CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
1. Measure the cylinder compression pressure of the misfiring cylinder Click here.
NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK
CHECK VALVE CLEARANCE (MISFIRING CYLINDER)
1. Check the valve clearance Click here.
NG
ADJUST VALVE CLEARANCE Click here

OK

REPLACE ECM Click here
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) Click here.
NG
CHECK FUEL PUMP OPERATION Click here

OK

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Click here

CHECK FUEL PRESSURE SENSOR

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Start the engine.
Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

While revving the engine, check that the fuel pressure fluctuates.

Standard
Idling
3000 to 5000 kPa
2000 rpm (No load)
7000 to 9000 kPa

Tech Tips

The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.

CHECK MISFIRE COUNT Click here

READ VALUE USING INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Start the engine and turn the tester on.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

Tech Tips

The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.

Read the value.

Enter the following menus: Data List / All Data / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).

Result

Item			Proceed to
Fuel Pump Duty (D4)	Short FT #1 + Long FT #1	Short FT #2 + Long FT #2	Proceed to
40% or more	-20% or less	-20% or less	A
10% or less	+20% or more	+20% or more	A
40% or more	+20% or more	+20% or more	B
10% or less	-20% or less	-20% or less	C
10% to 40%	-	-	D

INSPECT FUEL RELIEF VALVE ASSEMBLY Click here

REPLACE ECM Click here

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) Click here

REPLACE FUEL PRESSURE SENSOR Click here

CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
1. Change the installed spark plug to a spark plug that functions normally.
2. Perform a spark test.
  
  CAUTION:
  
  Always disconnect each injector connector.
  
  Note
  
  Do not crank the engine for more than 2 seconds.
  1. Install the spark plug to the ignition coil and connect the ignition coil connector.
  2. Disconnect the 2 fuel delivery pipe connectors..
  3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
  4. Ground the spark plug.
  5. Check if sparks occur while the engine is being cranked.
    
    OK
    
    Sparks jump across the electrode gap.
NG
CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER Click here

OK

REPLACE SPARK PLUG Click here
CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
1. Change the installed ignition coil to a ignition coil that functions normally.
2. Perform a spark test.
  
  CAUTION:
  
  Always disconnect each injector connector.
  
  Note
  
  Do not crank the engine for more than 2 seconds.
  1. Install the spark plug to the ignition coil and connect the ignition coil connector.
  2. Disconnect the 2 fuel delivery pipe connectors.
  3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
  4. Ground the spark plug.
  5. Check if sparks occur while the engine is being cranked.
    
    OK
    
    Sparks jump across the electrode gap.
NG
REPLACE ECM Click here

OK

REPLACE IGNITION COIL ASSEMBLY Click here
CHECK FUEL PUMP OPERATION
1. Check the fuel pump operation Click here.
NG
REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT Click here

OK
CHECK FUEL LINE
1. Check the fuel line for leakage and blockage.
NG
REPAIR OR REPLACE FUEL LINE

OK

CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP, PRESSURE REGULATOR, FUEL LINE AND FUEL FILTER)

CHECK MISFIRE COUNT

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Start the engine.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the tester: Powertrain / Engine / Data List / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

If no misfire counts occur for any of the cylinders, perform the following procedure:

Move the shift lever to D.

Monitor all of the misfire count values that are displayed on the tester.

Result

Misfire Count	Proceed to
No misfire counts, or misfire counts occur randomly in all cylinders	A
Misfire counts occur in particular cylinder	B

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Click here

INSPECT INJECTOR DRIVER

Turn the engine switch off.
Replace the No. 1 and No. 2 injector drivers with normal ones from another vehicle.

Note

Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.
Connect the intelligent tester to the DLC3.
Start the engine.
Clear DTCs Click here.
Perform the driving test.
Enter the following menus: Powertrain / Engine / DTC / Pending.

Read the pending DTCs.

Result
Result	Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
DTC is not output	B

REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2) Click here

INSPECT FUEL RELIEF VALVE ASSEMBLY

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Start the engine.
Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
Record the Fuel Press value.
Turn the engine switch off.
Wait for 10 seconds.
Turn the engine switch on (IG) and turn the tester on.
Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the tester.

Result

Inspection Result	Proceed to
Fuel Press value is maintained	A
Fuel Press value drops	B

REPLACE FUEL RELIEF VALVE ASSEMBLY Click here

REPLACE FUEL PUMP ASSEMBLY (HIGH PRESSURE) Click here

CHECK HARNESS AND CONNECTOR
1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM Click here.
  
  Tech Tips
  
  Repair any problems.
NEXT

CHECK WHETHER DTC OUTPUT RECURS

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Turn the engine switch off.
Turn the engine switch on (IG) and turn the tester on.
Start the engine and warm it up.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.

Check the DTC judgment result.

Result
Display (DTC Output)	Proceed to
ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)	A
NORMAL (No DTC output)	B

END

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Disconnect the mass air flow meter connector.
Disconnect the ECM connector.

Measure the resistance between the terminals.

Standard resistance (Check for Open)

Tester Connection	Condition	Specified Condition
E29-5 (VG) - E3-25 (VG)	Always	Below 1 Ω
E29-4 (E2G) - E3-24 (E2G)	Always	Below 1 Ω

Standard resistance (Check for Short)

Tester Connection	Condition	Specified Condition
E29-5 (VG) or E3-25 (VG) - Body ground	Always	10 kΩ or higher

Reconnect the mass air flow meter connector.
Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
1. Replace the mass air flow meter assembly Click here.
  
  Tech Tips
  
  If the results of the inspections performed in steps 16 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Turn the engine switch off.
Turn the engine switch on (IG) and turn the tester on.
Start the engine and warm it up.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.

Check the DTC judgment result.

Result
Display (DTC Output)	Proceed to
NORMAL (No DTC output)	A
ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)	B

REPLACE ECM Click here

END