СИСТЕМА SFI, 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 HC concentration levels can cause increase in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP 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 could cause emission deterioration, the ECM illuminates the MIL and set a DTC.

DTC No.	DTC Detection Condition	Trouble Area
P0300	Simultaneous misfiring of several cylinders detected (2 trip detection logic) High temperature misfire occurs in the Three-way Catalytic Converter (TWC) (MIL blinks when detect immediately). Catalyst deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Injector Fuel pressure Mass Air Flow (MAF) meter Engine Coolant Temperature (ECT) sensor Compression pressure Valve clearance Valve timing Ventilation valve and hose Ventilation hose connections Air induction system ECM
P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308	Misfiring of specific cylinder detected (2 trip detection logic) High temperature misfire occurs in the Three-way Catalytic Converter (TWC) (MIL blinks when detect immediately). Catalyst deterioration misfire occurs (MIL illuminates).	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Injector Fuel pressure Mass Air Flow (MAF) meter Engine Coolant Temperature (ECT) sensor Compression pressure Valve clearance Valve timing Ventilation valve and hose Ventilation hose connections Air induction system ECM

DTC No.

DTC Detection Condition

Trouble Area

P0300

Simultaneous misfiring of several cylinders detected

(2 trip detection logic)

High temperature misfire occurs in the Three-way Catalytic Converter (TWC) (MIL blinks when detect immediately).
Catalyst deterioration misfire occurs (MIL illuminates).

Open or short in engine wire harness
Connector connection
Vacuum hose connections
Ignition system
Injector
Fuel pressure
Mass Air Flow (MAF) meter
Engine Coolant Temperature (ECT) sensor
Compression pressure
Valve clearance
Valve timing
Ventilation valve and hose
Ventilation hose connections
Air induction system
ECM

P0301

P0302

P0303

P0304

P0305

P0306

P0307

P0308

Misfiring of specific cylinder detected

(2 trip detection logic)

High temperature misfire occurs in the Three-way Catalytic Converter (TWC) (MIL blinks when detect immediately).
Catalyst deterioration misfire occurs (MIL illuminates).

Open or short in engine wire harness
Connector connection
Vacuum hose connections
Ignition system
Injector
Fuel pressure
Mass Air Flow (MAF) meter
Engine Coolant Temperature (ECT) sensor
Compression pressure
Valve clearance
Valve timing
Ventilation valve and hose
Ventilation hose connections
Air induction system
ECM

When DTCs for misfiring cylinders are randomly set, 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.

Reference: Inspection using an oscilloscope.

With the engine idling, check the waveform between terminals #10 to #80 and E1 of the ECM connectors.

Tech Tips

The correct waveform is as shown.

MONITOR DESCRIPTION


*1	Camshaft Angle Sensor Plate
*2	Camshaft position Sensor
*3	Crank Angle Sensor Plate
*4	Crankshaft Position Sensor (36-2 teeth)

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).

An excessive misfiring rate (approximately 136 to 160 misfires per 1000 crankshaft revolutions) occurs 4 times.

The ECM flashes the MIL (immediate detection logic) and sets a DTC (2 trip detection logic) when either one of the following conditions, which could cause the Three-Way Catalytic Converter (TWC) damage, is detected (2 trip detection logic).

In every 200 crankshaft revolutions, the threshold misfiring percentage is recorded 3 times.

WIRING DIAGRAM

Refer to DTC P0201 Click here for the wiring diagram of the fuel injectors.

Refer to DTC P0351 Click here for the wiring diagram of the ignition system.

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Record the DTC(s) and freeze frame data.
Using the GTS, switch the ECM from normal mode to check mode Click here.
Read the misfire counts of each cylinder with the engine idling. 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 drive the vehicle for the period of time shown in the table below, with the Misfire RPM and Misfire Load in the Data List.

Engine RPM	Duration
Idling	8 minutes or more
1000	4.5 minutes or more
2000	2.5 minutes or more
3000	1.5 minute 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 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.

CAUTION / NOTICE / HINT

Tech Tips

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
Read freeze frame data using the GTS. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the freeze frame data.
The misfire still cannot be reproduced even though the conditions stored in the freeze frame data have been duplicated, one of the following factors is considered to be a possible cause of the problem:

The fuel tank is low full.
Improper fuel is used.
The spark plugs have been contaminated.
The problem is complex.

After finishing repairs, check the misfire counts of the cylinders.
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern, after repairs.
For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set.

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

Clear the DTC Click here.
Start the engine and conduct the confirmation driving pattern.
Read the misfiring rates of each cylinder or DTC(s) using the GTS.
Repair the cylinder(s) that has a high misfiring rate 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.

PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read DTCs.

Result
Display (DTC Output)	Proceed to
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308	A
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs	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 CONNECTIONS
1. Check the PCV hose connections.
  
  OK
  
  PCV hose is connected correctly and is not damaged.
NG
REPAIR OR REPLACE PCV HOSE

OK
READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD)
1. Connect the GTS to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the GTS on.
4. Enter the following menus: Powertrain / Engine / Data List / Misfire RPM and Misfire Load.
5. 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.

READ VALUE USING GTS (MISFIRE COUNT)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear DTCs Click here.
Enter the following menus: Powertrain / Engine / Data List / Cylinder #1 to #8 Misfire Count.
Allow the engine to idle.

Read each value of Cylinder #1 to #8 Misfire Count displayed on the GTS. If no misfire counts occur in any cylinders, perform the following procedures:

Start the engine and let it idle.
Move the shift lever to D.
Check the Cylinder #1 to #8 Misfire Count.

If misfire counts are still not displayed, perform procedure "A" and "B", and then check the misfire counts again.

Procedure A: Drive the vehicle while satisfying the Misfire RPM and Misfire Load values noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedure above.

Procedure B: Read the Cylinder #1 to #8 Misfire Count or the DTCs output on the GTS.

Result
Result	Proceed to
Most misfires occur in only 1 or 2 cylinders	A
3 cylinders or more have equal misfire counts	B

CHECK AIR INDUCTION SYSTEM Click here

INSPECT SPARK PLUG
1. Inspect the spark plug of the misfiring cylinder Click here.
NG
REPLACE SPARK PLUG Click here

OK
CHECK FOR SPARKS AND IGNITION
1. Perform a spark test Click here.
  
  CAUTION:
  
  Always disconnect all the injector connectors.
  
  Note
  
  Do not crank the engine for more than 2 seconds.
  
  OK
  
  Spark jumps across electrode gap.
NG
CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

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

OK

OK
Spark jumps across electrode gap.

CHECK FUEL INJECTOR (POWER SOURCE VOLTAGE)

*1 Front view of wire harness connector: (to Fuel Injector)

Disconnect the fuel injector connector.
Turn the engine switch on (IG).

*1	Front view of wire harness connector: (to Fuel Injector)

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
J5-2 - Body ground	Engine switch on (IG)	11 to 14 V
I5-2 - Body ground	Engine switch on (IG)	11 to 14 V
J6-2 - Body ground	Engine switch on (IG)	11 to 14 V
I6-2 - Body ground	Engine switch on (IG)	11 to 14 V
J7-2 - Body ground	Engine switch on (IG)	11 to 14 V
I7-2 - Body ground	Engine switch on (IG)	11 to 14 V
J8-2 - Body ground	Engine switch on (IG)	11 to 14 V
I8-2 - Body ground	Engine switch on (IG)	11 to 14 V

CHECK AND REPLACE HARNESS OR CONNECTOR (INJ FUSE - FUEL INJECTOR)

CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR)

Disconnect the E2 and E4 ECM connectors.


*1	Front view of wire harness connector: (to Fuel Injector for Port Injection)
*2	Rear view of wire harness connector: (to ECM)

Disconnect the fuel injector connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
J5-1 - E4-17 (#10)	Always	Below 1 Ω
I5-1 - E2-11 (#20)	Always	Below 1 Ω
J6-1 - E4-16 (#30)	Always	Below 1 Ω
I6-1 - E2-10 (#40)	Always	Below 1 Ω
J7-1 - E4-15 (#50)	Always	Below 1 Ω
I7-1 - E2-9 (#60)	Always	Below 1 Ω
J8-1 - E4-14 (#70)	Always	Below 1 Ω
I8-1 - E2-8 (#80)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
J5-1 or E4-17 (#10) - Body ground	Always	10 kΩ or higher
I5-1 or E2-11 (#20) - Body ground	Always	10 kΩ or higher
J6-1 or E4-16 (#30) - Body ground	Always	10 kΩ or higher
I6-1 or E2-10 (#40) - Body ground	Always	10 kΩ or higher
J7-1 or E4-15 (#50) - Body ground	Always	10 kΩ or higher
I7-1 or E2-9 (#60) - Body ground	Always	10 kΩ or higher
J8-1 or E4-14 (#70) - Body ground	Always	10 kΩ or higher
I8-1 or E2-8 (#80) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK FUEL INJECTOR OF MISFIRING CYLINDER
1. Check the fuel injector injection [whether fuel volume is high or low, and whether injection pattern is poor] Click here.
NG
REPLACE FUEL INJECTOR Click here

OK
CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leakage.
  
  OK
  
  No leakage in air induction system.
NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK
CHECK FUEL PRESSURE
1. Check the fuel pressure Click here.
NG
CHECK FUEL LINE Click here

OK

OK
No leakage in air induction system.

READ VALUE USING GTS (COOLANT TEMP)

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

Read the Coolant Temp value when the engine is cold and warmed-up.

Standard
ECT when the engine is cold: Same as ambient temperature
ECT when the engine is warmed up: 75 to 95°C (167 to 203°F)

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING GTS (MAF Sensor 1, MAF Sensor 2)
1. Connect the GTS to the DLC3.
2. Start the engine and turn the GTS on.
3. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temp, MAF Sensor 1 and MAF Sensor 2.
4. Allow the engine to idle until the ECT reaches 75°C (167°F) or higher.
5. Read MAF Sensor 1 and MAF Sensor 2 with the engine speed at 3000 rpm.
  
  Standard
  
  Between 3.6 to 17.6 g/s (shift lever is in N position and A/C is OFF)
NG
CHECK HARNESS AND CONNECTOR Click here

OK
CHECK VALVE TIMING
*a Timing Mark
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. Rotate the crankshaft pulley and align its notch to timing mark 0 of the timing chain cover. 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 cover.
OK
CHECK HARNESS AND CONNECTOR Click here

NG
ADJUST VALVE TIMING Click here
CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leakage.
  
  OK
  
  No leakage in air induction system.
NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK
CHECK FUEL PRESSURE
1. Check the fuel pressure Click here.
NG
CHECK FUEL LINE Click here

OK

Standard
Between 3.6 to 17.6 g/s (shift lever is in N position and A/C is OFF)

*a	Timing Mark

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

READ VALUE USING GTS (COOLANT TEMP)

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

Read the Coolant Temp value when the engine is cold and warmed-up.

Standard
ECT when the engine is cold: Same as ambient temperature
ECT when the engine is warmed up: 75 to 95°C (167 to 203°F)

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING GTS (MAF Sensor 1, MAF Sensor 2)
1. Connect the GTS to the DLC3.
2. Start the engine and turn the GTS on.
3. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temp, MAF Sensor 1 and MAF Sensor 2.
4. Allow the engine to idle until the ECT reaches 75°C (167°F) or higher.
5. Read MAF Sensor 1 and MAF Sensor 2 with the engine speed at 3000 rpm.
  
  Standard
  
  Between 3.6 to 17.6 g/s (shift lever is in N position and A/C is OFF)
NG
CHECK HARNESS AND CONNECTOR Click here

OK
CHECK VALVE TIMING
*a Timing Mark
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. Rotate the crankshaft pulley and align its notch to timing mark 0 of the timing chain cover. 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 cover.
NG
ADJUST VALVE TIMING Click here

OK
INSPECT SPARK PLUG
1. Inspect the spark plug of the misfiring cylinder Click here.
NG
REPLACE SPARK PLUG Click here

OK
CHECK FOR SPARKS AND IGNITION
1. Perform a spark test Click here.
  
  CAUTION:
  
  Always disconnect all injector connectors.
  
  Note
  
  Do not crank the engine for more than 2 seconds.
  
  OK
  
  Sparks jump across electrode gap.
NG
CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

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

OK

CHECK FUEL INJECTOR (POWER SOURCE VOLTAGE)

*1 Front view of wire harness connector: (to Fuel Injector)

Disconnect the fuel injector connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
J5-2 - Body ground	Engine switch on (IG)	11 to 14 V
I5-2 - Body ground	Engine switch on (IG)	11 to 14 V
J6-2 - Body ground	Engine switch on (IG)	11 to 14 V
I6-2 - Body ground	Engine switch on (IG)	11 to 14 V
J7-2 - Body ground	Engine switch on (IG)	11 to 14 V
I7-2 - Body ground	Engine switch on (IG)	11 to 14 V
J8-2 - Body ground	Engine switch on (IG)	11 to 14 V
I8-2 - Body ground	Engine switch on (IG)	11 to 14 V

CHECK AND REPLACE HARNESS OR CONNECTOR (INJ FUSE - FUEL INJECTOR)

CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR)

Disconnect the E2 and E4 ECM connectors.


*1	Front view of wire harness connector: (to Fuel Injector for Port Injection)
*2	Rear view of wire harness connector: (to ECM)

Disconnect the fuel injector connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
J5-1 - E4-17 (#10)	Always	Below 1 Ω
I5-1 - E2-11 (#20)	Always	Below 1 Ω
J6-1 - E4-16 (#30)	Always	Below 1 Ω
I6-1 - E2-10 (#40)	Always	Below 1 Ω
J7-1 - E4-15 (#50)	Always	Below 1 Ω
I7-1 - E2-9 (#60)	Always	Below 1 Ω
J8-1 - E4-14 (#70)	Always	Below 1 Ω
I8-1 - E2-8 (#80)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
J5-1 or E4-17 (#10) - Body ground	Always	10 kΩ or higher
I5-1 or E2-11 (#20) - Body ground	Always	10 kΩ or higher
J6-1 or E4-16 (#30) - Body ground	Always	10 kΩ or higher
I6-1 or E2-10 (#40) - Body ground	Always	10 kΩ or higher
J7-1 or E4-15 (#50) - Body ground	Always	10 kΩ or higher
I7-1 or E2-9 (#60) - Body ground	Always	10 kΩ or higher
J8-1 or E4-14 (#70) - Body ground	Always	10 kΩ or higher
I8-1 or E2-8 (#80) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER
1. Check the fuel injector injection [whether fuel volume is high or low, and whether injection pattern is poor] Click here.
NG
REPLACE FUEL INJECTOR ASSEMBLY Click here

OK
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 GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs Click here.
Turn the engine switch off.
Turn the engine switch on (IG) and turn the GTS 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)	A
NORMAL (No DTC)	B

END

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

Disconnect the E13 and E22 MAF meter connectors.
Disconnect the E1 ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E13-1 (VG) - E1-25 (VG)	Always	Below 1 Ω
E13-2 (E2G) - E1-24 (E2G)	Always	Below 1 Ω
E22-1 (VGR) - E1-23 (VG2)	Always	Below 1 Ω
E22-2 (EVGR) - E1-32 (E2G2)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E13-1 (VG) or E1-25 (VG) - Body ground	Always	10 kΩ or higher
E22-1 (VGR) or E1-23 (VG2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MASS AIR FLOW METER
1. Replace the mass air flow meter Click here.
  
  Tech Tips
  
  If the results of the inspections performed in steps 14 and 19 indicated no problem, proceed to the next step without replacing the mass air flow meter.
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs Click here.
Turn the engine switch off.
Turn the engine switch on (IG) and turn the GTS 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)	A
ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308)	B

END

REPLACE ECM 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 all injector connectors.
  
  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 injector connectors.
  3. Ground the spark plug.
  4. Check if sparks occur while the engine is being cranked.
    
    OK
    
    Sparks jump across electrode gap.
OK
REPLACE SPARK PLUG Click here

NG
CHANGE TO NORMAL IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER
1. Change the ignition coil to an ignition coil that functions normally.
2. Perform a spark test.
  
  CAUTION:
  
  Always disconnect all fuel injector connectors.
  
  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 fuel injector connectors.
  3. Ground the spark plug.
  4. Check if sparks occur while the engine is being cranked.
    
    OK
    
    Sparks jump across electrode gap.
OK
REPLACE IGNITION COIL ASSEMBLY Click here

NG
REPLACE ECM Click here
CHECK FUEL LINE
1. Check the fuel lines for leaks or blockage.
OK
REPLACE FUEL PUMP Click here

NG
REPAIR OR REPLACE FUEL LINE