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

Text in Illustration
*1	Camshaft Position Sensor
*2	Crankshaft Position Sensor
*3	ECM

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emissions levels. High concentrations of HC can also cause increases in the Three-way Catalytic Converter (TWC) temperature, which may cause damage to the Three-way Catalytic Converter (TWC). To prevent these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the Three-way Catalytic Converter (TWC) reaches the point of thermal degradation, the MIL blinks. 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 as when the crankshaft rotation speed variations exceed predetermined thresholds.

If the misfire rate exceeds the threshold level, the ECM illuminates the MIL and stores 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 the Three-way Catalytic Converter (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 Fuel injector assembly Fuel pressure Mass air flow meter assembly Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Air induction 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 the Three-way Catalytic Converter (MIL blinks when detect immediately). Catalyst deterioration misfire occurs (MIL illuminates).

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 the Three-way Catalytic Converter (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
Fuel injector assembly
Fuel pressure
Mass air flow meter assembly
Engine coolant temperature sensor
Compression pressure
Valve timing
PCV valve and hose
PCV hose connections
Air induction 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 the Three-way Catalytic Converter (MIL blinks when detect immediately).
Catalyst deterioration misfire occurs (MIL illuminates).

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

MONITOR DESCRIPTION

The ECM illuminates the MIL and stores a DTC when the following condition, which could cause catalyst deterioration, is detected (2 trip detection logic).

An excessive misfiring rate (approximately 130 to 160 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL (immediate detection logic) and stores a DTC (2 trip detection logic) when either one of the following condition, which could cause damage to the three-way catalytic converter , is detected.

A sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

WIRING DIAGRAM

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.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
Using the GTS, switch the ECM from normal mode to check mode Click here.
Read the misfire counts of each cylinder (cylinder No. 1 to No. 8) 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 speed and engine load, as shown in Misfire RPM and Misfire Load in the freeze frame data.

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 with the engine speed and engine load the same as Misfire RPM and Misfire Load in the freeze frame data.

Engine Speed	Duration
Idling	8.0 minutes or more
1000	4.5 minutes or more
2000	2.5 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 DTCs and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTCs, freeze frame data and other data will be cleared.
Record the DTCs, freeze frame data and misfire counts.
Turn the engine switch off and wait for at least 30 seconds.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

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 condition 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 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 may be a cause of the problem:

The fuel level is low.
Improper fuel is being used.
The spark plugs are dirty.

After finishing repairs, check that no misfires occur in each cylinder (cylinder No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7 and No. 8).
Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after the repairs.
For 6 and 8 cylinder engines, the ECM intentionally does not store the specific misfiring cylinder DTCs at high engine speed. If misfires only occur during high engine speed driving, only DTC P0300 is stored.

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

Clear the DTCs Click here.
Start the engine and conduct the confirmation driving pattern.
Read the misfiring rates of each cylinder or the DTCs using the GTS.
Repair the cylinders that have a high misfiring rate or are indicated by the DTCs.
After finishing repairs, conduct the confirmation driving pattern again in order to verify that DTC P0300 is not stored.

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 Coolant Temp in the freeze frame data is below 75°C (167°F), the misfires may have occurred only while warming up the engine.
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be stored.

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 and ECT / Trouble Codes.

Read DTCs.

Result
Result	Proceed to
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 is output	A
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 CONNECTIONS
1. Check the PCV hose connections Click here.
  
  OK
  
  PCV hose is connected correctly and is not damaged.
NG
REPAIR OR REPLACE PCV HOSE Click here

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 and ECT / Data List / All Data / 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 and ECT / Data List / All Data / Cylinder #1 Misfire Rate, #2, #3, #4, #5, #6, #7 and #8.
Allow the engine to idle.

Read each value for CYL #1 to #8 (Cylinder #1 Misfire Rate to #8) displayed on the GTS. If no misfire counts occur in any cylinders, perform the following procedures:

Move the shift lever to D.
Check CYL #1 to #8 (Cylinder #1 Misfire Rate to #8).

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 CYL #1 to #8 (Cylinder #1 Misfire Rate to #8) 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

Tech Tips

If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
If the freeze frame data's record of the engine coolant temperature is below 75°C (167°F), the misfire may be detected only when the engine is cold.
If the freeze frame data's record of the Engine Run Time is less than 120 seconds, the misfire may be detected immediately after the engine is started.

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.
  
  Tech Tips
  
  If the result of the spark test is normal, proceed to the next step.
NEXT
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 ASSEMBLY (POWER SOURCE)

Text in Illustration
*a	Front view of wire harness connector (to Fuel Injector Assembly)

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

Cylinder	Tester Connection	Switch Condition	Specified Condition
No. 1	a5-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 2	a1-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 3	a6-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 4	a2-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 5	a7-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 6	a3-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 7	a8-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 8	a4-2 - Body ground	Engine switch on (IG)	11 to 14 V

GO TO FUEL INJECTOR CIRCUIT Click here

CHECK HARNESS AND CONNECTOR

Disconnect the fuel injector connector.
Disconnect the ECM connector.

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

Standard Resistance

for RHD
Cylinder	Tester Connection	Condition	Specified Condition
No. 1	a5-1 - Body ground	Always	10 kΩ or higher
No. 1	a5-1 - C46-86 (#10)	Always	Below 1 Ω
No. 2	a1-1 - Body ground	Always	10 kΩ or higher
No. 2	a1-1 - C46-109 (#20)	Always	Below 1 Ω
No. 3	a6-1 - Body ground	Always	10 kΩ or higher
No. 3	a6-1 - C46-85 (#30)	Always	Below 1 Ω
No. 4	a2-1 - Body ground	Always	10 kΩ or higher
No. 4	a2-1 - C46-108 (#40)	Always	Below 1 Ω
No. 5	a7-1 - Body ground	Always	10 kΩ or higher
No. 5	a7-1 - C46-84 (#50)	Always	Below 1 Ω
No. 6	a3-1 - Body ground	Always	10 kΩ or higher
No. 6	a3-1 - C46-107 (#60)	Always	Below 1 Ω
No. 7	a8-1 - Body ground	Always	10 kΩ or higher
No. 7	a8-1 - C46-83 (#70)	Always	Below 1 Ω
No. 8	a4-1 - Body ground	Always	10 kΩ or higher
No. 8	a4-1 - C46-106 (#80)	Always	Below 1 Ω

for RHD
Cylinder	Tester Connection	Condition	Specified Condition
No. 1	a5-1 - Body ground	Always	10 kΩ or higher
No. 1	a5-1 - C45-86 (#10)	Always	Below 1 Ω
No. 2	a1-1 - Body ground	Always	10 kΩ or higher
No. 2	a1-1 - C45-109 (#20)	Always	Below 1 Ω
No. 3	a6-1 - Body ground	Always	10 kΩ or higher
No. 3	a6-1 - C45-85 (#30)	Always	Below 1 Ω
No. 4	a2-1 - Body ground	Always	10 kΩ or higher
No. 4	a2-1 - C45-108 (#40)	Always	Below 1 Ω
No. 5	a7-1 - Body ground	Always	10 kΩ or higher
No. 5	a7-1 - C45-84 (#50)	Always	Below 1 Ω
No. 6	a3-1 - Body ground	Always	10 kΩ or higher
No. 6	a3-1 - C45-107 (#60)	Always	Below 1 Ω
No. 7	a8-1 - Body ground	Always	10 kΩ or higher
No. 7	a8-1 - C45-83 (#70)	Always	Below 1 Ω
No. 8	a4-1 - Body ground	Always	10 kΩ or higher
No. 8	a4-1 - C45-106 (#80)	Always	Below 1 Ω

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

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).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

Read Coolant Temp 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 100°C (167°F and 212°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING GTS (MAF)
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 and ECT / 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 18.3 gm/s. and 25.8 gm/s. (shift lever: N; A/C: Off).
NG
CHECK HARNESS AND CONNECTOR Click here

OK
CHECK VALVE TIMING
1. Remove the cylinder head cover LH and RH.
2. Turn the crankshaft pulley and align its groove with the "0" alignment mark of the timing chain cover.
3. Check that the alignment marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  Tech Tips
  
  If the alignment marks are not as shown, turn the crankshaft one revolution clockwise.
  
  OK
  
  Alignment marks on camshaft timing gears are aligned as shown in the illustration.
OK
CHECK HARNESS AND CONNECTOR Click here

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

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

OK

Standard
Between 18.3 gm/s. and 25.8 gm/s. (shift lever: N; A/C: Off).

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

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).
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

Read Coolant Temp 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 100°C (167°F and 212°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

READ VALUE USING GTS (MAF)
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 and ECT / 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 18.3 gm/sec. and 25.8 gm/sec. (shift lever: N; A/C: Off).
NG
CHECK HARNESS AND CONNECTOR Click here

OK
CHECK VALVE TIMING
1. Remove the cylinder head cover LH and RH.
2. Turn the crankshaft pulley and align its groove with the "0" alignment mark of the timing chain cover.
3. Check that the alignment marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  Tech Tips
  
  If the alignment marks are not as shown, turn the crankshaft one revolution clockwise.
  
  OK
  
  Alignment marks on camshaft timing gears are aligned as shown in the illustration.
NG
CHECK ENGINE MECHANICAL SYSTEM 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.
  
  Tech Tips
  
  If the result of the spark test is normal, proceed to the next step.
NEXT
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 ASSEMBLY (POWER SOURCE)

Text in Illustration
*a	Front view of wire harness connector (to Fuel Injector Assembly)

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

Cylinder	Tester Connection	Switch Condition	Specified Condition
No. 1	a5-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 2	a1-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 3	a6-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 4	a2-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 5	a7-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 6	a3-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 7	a8-2 - Body ground	Engine switch on (IG)	11 to 14 V
No. 8	a4-2 - Body ground	Engine switch on (IG)	11 to 14 V

GO TO FUEL INJECTOR CIRCUIT Click here

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - ECM)

Disconnect the fuel injector connector.
Disconnect the ECM connector.

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

Standard Resistance

for RHD
Cylinder	Tester Connection	Condition	Specified Condition
No. 1	a5-1 - Body ground	Always	10 kΩ or higher
No. 1	a5-1 - C46-86 (#10)	Always	Below 1 Ω
No. 2	a1-1 - Body ground	Always	10 kΩ or higher
No. 2	a1-1 - C46-109 (#20)	Always	Below 1 Ω
No. 3	a6-1 - Body ground	Always	10 kΩ or higher
No. 3	a6-1 - C46-85 (#30)	Always	Below 1 Ω
No. 4	a2-1 - Body ground	Always	10 kΩ or higher
No. 4	a2-1 - C46-108 (#40)	Always	Below 1 Ω
No. 5	a7-1 - Body ground	Always	10 kΩ or higher
No. 5	a7-1 - C46-84 (#50)	Always	Below 1 Ω
No. 6	a3-1 - Body ground	Always	10 kΩ or higher
No. 6	a3-1 - C46-107 (#60)	Always	Below 1 Ω
No. 7	a8-1 - Body ground	Always	10 kΩ or higher
No. 7	a8-1 - C46-83 (#70)	Always	Below 1 Ω
No. 8	a4-1 - Body ground	Always	10 kΩ or higher
No. 8	a4-1 - C46-106 (#80)	Always	Below 1 Ω

for RHD
Cylinder	Tester Connection	Condition	Specified Condition
No. 1	a5-1 - Body ground	Always	10 kΩ or higher
No. 1	a5-1 - C45-86 (#10)	Always	Below 1 Ω
No. 2	a1-1 - Body ground	Always	10 kΩ or higher
No. 2	a1-1 - C45-109 (#20)	Always	Below 1 Ω
No. 3	a6-1 - Body ground	Always	10 kΩ or higher
No. 3	a6-1 - C45-85 (#30)	Always	Below 1 Ω
No. 4	a2-1 - Body ground	Always	10 kΩ or higher
No. 4	a2-1 - C45-108 (#40)	Always	Below 1 Ω
No. 5	a7-1 - Body ground	Always	10 kΩ or higher
No. 5	a7-1 - C45-84 (#50)	Always	Below 1 Ω
No. 6	a3-1 - Body ground	Always	10 kΩ or higher
No. 6	a3-1 - C45-107 (#60)	Always	Below 1 Ω
No. 7	a8-1 - Body ground	Always	10 kΩ or higher
No. 7	a8-1 - C45-83 (#70)	Always	Below 1 Ω
No. 8	a4-1 - Body ground	Always	10 kΩ or higher
No. 8	a4-1 - C45-106 (#80)	Always	Below 1 Ω

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 and ECT / 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 according to the value(s) in the table below.

Standard Resistance

for RHD
Tester Connection	Condition	Specified Condition
C50-3 (VG) - C46-74 (VG)	Always	Below 1 Ω
C50-2 (E2G) - C46-75 (E2G)	Always	Below 1 Ω
C50-3 (VG) or C46-74 (VG) - Body ground	Always	10 kΩ or higher

for LHD
Tester Connection	Condition	Specified Condition
C50-3 (VG) - C45-74 (VG)	Always	Below 1 Ω
C50-2 (E2G) - C45-75 (E2G)	Always	Below 1 Ω
C50-3 (VG) or C45-74 (VG) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MASS AIR FLOW METER ASSEMBLY
1. Replace the mass air flow meter assembly 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 assembly.
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 and ECT / 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

END

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