DTC    P0300    Random / Multiple Cylinder Misfire Detected

DTC    P0301    Cylinder 1 Misfire Detected

DTC    P0302    Cylinder 2 Misfire Detected

DTC    P0303    Cylinder 3 Misfire Detected

DTC    P0304    Cylinder 4 Misfire Detected

DTC    P0305    Cylinder 5 Misfire Detected

DTC    P0306    Cylinder 6 Misfire Detected

DTC    P0307    Cylinder 7 Misfire Detected

DTC    P0308    Cylinder 8 Misfire Detected

for Preparation Click here


DESCRIPTION

A093767E03
When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases 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 these increases 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 MIL blinks. 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 as when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire rate exceeds the threshold level, the ECM illuminates the MIL and sets a DTC.

DTC Code
DTC Detection Condition
Trouble Area
P0300
Simultaneous misfiring of several cylinders occurs and one of following conditions below is detected (2 trip detection logic):
  1. High temperature misfire occurs in Three-Way Catalytic Converter (TWC) (MIL blinks when detect immediately).
  2. Emission deterioration misfire occurs (MIL illuminates)
  1. Open or short in engine wire harness
  2. Connector connection
  3. Vacuum hose connections
  4. Ignition system
  5. Injector
  6. Fuel pressure
  7. Mass Air Flow (MAF) meter
  8. Engine Coolant Temperature (ECT) sensor
  9. Compression pressure
  10. Valve timing
  11. PCV valve and hose
  12. PCV hose connections
  13. Air induction system
  14. 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):
  1. Misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  2. Catalyst deterioration misfire occurs (MIL illuminates).
When multiple DTCs for misfiring cylinders are 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.

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).
  1. Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs once.
  2. An excessive misfiring rate (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 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:
  1. At a high engine rpm, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs once.
  2. At a normal engine rpm, a catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs 3 times.

HINT:
If a catalyst damage misfire occurs, the ECM informs the driver by flashing the MIL.
  1. Misfire Monitor for Mexico Models
    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).
    1. Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 1000 misfires per 1000 crankshaft revolutions) occurs once.
    2. An excessive misfiring rate (approximately 500 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.
    The ECM flashes the MIL and sets a DTC when the following condition, which could cause the Three-Way Catalytic Converter (TWC) damage, is detected (2 trip detection logic).
    1. A catalyst damage misfire, which monitored every 200 crankshaft revolutions, occurs 3 times.

MONITOR STRATEGY


Related DTCs
P0300: Multiple cylinder misfire
P0301: Cylinder 1 misfire
P0302: Cylinder 2 misfire
P0303: Cylinder 3 misfire
P0304: Cylinder 4 misfire
P0305: Cylinder 5 misfire
P0306: Cylinder 6 misfire
P0307: Cylinder 7 misfire
P0308: Cylinder 8 misfire
Required Sensors/Components (Main)
Crankshaft position sensor and Camshaft position sensor
Required Sensors/Components (Related)
Engine coolant temperature and intake air temperature sensors and Mass air flow meter
Frequency of Operation
Continuous
Duration
1000 crankshaft revolutions (soon after engine is started: 1 time, other 4 times) (Emissions-related misfire)
200 crankshaft revolutions (1 or 3 times) (Catalyst-damaging misfire)
MIL Operation
2 driving cycles: MIL illuminates when misfire detect
MIL flashes immediately: When catalyst damaged misfire occur
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Misfire: 
Monitor runs whenever following DTCs not present
P0016, P0018 (VVT System - Misalignment)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0102, P0103 (Mass air flow meter)
P0112, P0113 (Intake air temperature sensor)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0327, P0328, P0332, P0333, P032C, P032D, P033C, P033D (Knock sensor)
P0335 (Crankshaft position sensor)
P1340 (Camshaft position sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle speed sensor)
P0705 (Shift lever position switch)
Battery voltage
8 V or more
VVT system
Not operated by scan tool
Engine RPM
400 to 5900 rpm
Either of following conditions (a) or (b) met
-
(a) ECT at engine start
More than -7°C (19°F)
(b) ECT
More than 20°C (68°F)
Fuel cut
OFF

Monitor period of emission-related-misfire: 
First 1000 revolutions after engine start, or Check Mode
Crankshaft 1000 revolutions
Except above
Crankshaft 1000 revolutions x 4

Monitor period of catalyst-damaged-misfire (MIL blinks): 
All of following conditions 1, 2, 3 and 4 met
Crankshaft 200 revolutions x 3
1. Driving cycles
1st
2. Check mode
OFF
3. Engine RPM
Less than 2800 rpm
4. Engine load
Less than 80 %
Except above
Crankshaft 200 revolutions
  1. FOR MEXICO MODELS:

Misfire: for Mexico models 
Monitor runs whenever following DTCs not present
P0016, P0018 (VVT System - Misalignment)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0102, P0103 (Mass air flow meter)
P0112, P0113 (Intake air temperature sensor)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0327, P0328, P0332, P0333, P032C, P032D, P033C, P033D (Knock sensor)
P0335 (Crankshaft position sensor)
P1340 (Camshaft position sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle speed sensor)
P0705 (Shift lever position switch)
Battery voltage
8 V or more
VVT system
Not operated by scan tool
Engine RPM
450 to 4500 rpm
ECT
More than 65°C (149°F)
Fuel cut
OFF

Monitor period of emission-related-misfire: for Mexico models 
First 1000 revolutions after engine start, or Check Mode
Crankshaft 1000 revolutions
Except above
Crankshaft 1000 revolutions x 4

Monitor period of catalyst-damaged-misfire (MIL blinks): for Mexico models 
All of following conditions 1 and 2 met
Crankshaft 200 revolutions x 3
1. Driving cycles
1st
2. Check mode
OFF
Except above
Crankshaft 200 revolutions

TYPICAL MALFUNCTION THRESHOLDS


Monitor period of emission-related-misfire: 
Misfire rate
1.5% or more

Monitor period of catalyst-damaged-misfire (MIL blinks): 
Number of misfire per 200 revolutions
103 or more (varies with intake air amount and RPM)
  1. FOR MEXICO MODELS:

Monitor period of emission-related-misfire: for Mexico models 
Misfire rate
25% or more: for 1st 1000 revolutions
12.5% or more: after 1st 1000 revolutions

Monitor period of catalyst-damaged-misfire (MIL blinks): for Mexico models 
Number of misfire per 200 revolutions
103 or more (varies with intake air amount and RPM)
Paired cylinder misfire (MIL blinks immediately)
Detected

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (Click here).

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Record the DTC(s) and freeze frame data.
  5. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  6. Using the tester, switch the ECM from normal mode to check mode (Click here).
  7. Read the misfire counts of each cylinder (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count) with the engine in an idling condition.
  8. 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.

    HINT:
    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 RPM
    		Duration
    Idling
    		8.0 minutes or more
    1000
    		4.5 minutes or more
    2000
    		2.5 minutes or more
    3000
    		1.5 minute or more
  9. Check whether misfires have occurred by checking DTCs and freeze frame data.

    HINT:
    Do not turn the ignition 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.
  10. Record the DTC(s), freeze frame data and misfire counts.
  11. Turn the ignition switch off and wait for at least 15 seconds.
  12. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

WIRING DIAGRAM


A164725E02


A259910E01


A259911E01


INSPECTION PROCEDURE

HINT:
  1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
  2. Read freeze frame data using the Techstream. 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.
  3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the freeze frame data.
  4. If 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:
    1. The fuel level is low.
    2. Improper fuel is used.
    3. The spark plugs are dirty.
  5. 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).
  6. Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern, after the repairs.
  7. For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine RPM. If misfires only occur during high engine RPM driving, only DTC P0300 is set.
    In the event of DTC P0300 being present, perform the following operations:
    1. Clear the DTC (Click here).
    2. Start the engine and conduct the confirmation driving pattern.
    3. Read the misfiring rates of each cylinder or DTC(s) using the Techstream.
    4. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
    5. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
  8. When either 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).
  9. When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires occurred only while warming up the engine.
  10. An extremely imbalanced drive wheel can cause body vibration, which may cause misfire DTC(s) to be stored.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read DTCs.

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

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


B
GO TO DTC CHART (Click here)
A


2.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 (Click here)
OK


3.READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Misfire RPM and Misfire Load.

  1. Read and note the Misfire RPM and Misfire Load values.

    HINT:
    The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

NEXT


4.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.

  1. Read the value displayed on the Techstream.

    Result 
    Data List
    		Display Item
    		Proceed to
    Catalyst OT MF F/C
    		Avail
    		A
    Not Avl
    		B


B
Go to step 6
A


5.PERFORM ACTIVE TEST USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Clear DTCs (Click here).

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.

  1. Perform the Active Test.

    NOTICE:
    When performing the Active Test, make sure the vehicle is stopped and either idling or being revved within 3000 rpm.

NEXT


6.READ VALUE USING TECHSTREAM (MISFIRE COUNT)

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Cylinder #1 Misfire Rate, #2, #3, #4, #5, #6, #7 and #8.

  1. Allow the engine to idle.

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

    1. Move the shift lever to the D position.

    2. Check the Cylinder #1 Misfire Rate to #8.

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

  1. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "READ VALUE USING Techstream Misfire RPM and Misfire Load" procedures above. (Procedure "A")

  1. Read the Cylinder #1 Misfire Rate to #8 or DTCs displayed on the Techstream. (Procedure "B")

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

    HINT:
    1. 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.
    2. If the freeze frame data's record of the ECT is below 75°C (167°F), the misfire may be detected only when the engine is cold.
    3. If the freeze frame data's record of the Engine Run Time is below 120 seconds, the misfire may be detected immediately after the engine is started.


B
Go to step 17
A


7.INSPECT SPARK PLUG

  1. Inspect the spark plug of the misfiring cylinder (Click here).



NG
REPLACE SPARK PLUG (Click here)
OK


8.CHECK FOR SPARK (SPARK TEST)

  1. Perform a spark test (Click here).

    HINT:
    If the result of the spark test is normal, proceed to the next step.

NEXT


9.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


10.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70 AND/OR #80 VOLTAGE)
A136305E22

  1. Disconnect the D74 ECM connector.

  1. Turn the ignition switch to ON.

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D74-86 (#10) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-109 (#20) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-85 (#30) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-108 (#40) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-84 (#50) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-107 (#60) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-83 (#70) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-106 (#80) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V


NG
GO TO FUEL INJECTOR CIRCUIT (Click here)
OK


11.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

  1. Check the 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


12.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leakage (Click here).

    OK:
    No leakage from air induction system.


NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM (Click here)
OK


13.CHECK FUEL PRESSURE

  1. Check the fuel pressure (Click here).



NG
Go to step 32
OK


14.READ VALUE USING TECHSTREAM (COOLANT TEMP)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

  1. Read the 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).


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (Click here)
OK


15.READ VALUE USING TECHSTREAM (MAF)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.

  1. Allow the engine to idle until the Coolant Temp reaches 75°C (167°F) or more.

  1. Read MAF with the engine speed at 3000 rpm.

    Standard:
    Between 18.0 gm/s and 27.0 gm/s (shift lever: N; A/C: Off).


NG
Go to step 27
OK


16.CHECK VALVE TIMING

A166451E01

  1. Remove the cylinder head cover LH and RH.

  1. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.

  1. 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.


NG
ADJUST VALVE TIMING (Click here)
OK


17.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leakage (Click here).

    OK:
    No leakage from air induction system.


NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM (Click here)
OK


18.CHECK FUEL PRESSURE

  1. Check the fuel pressure (Click here).



NG
CHECK FUEL LINE
OK


19.READ VALUE USING TECHSTREAM (COOLANT TEMP)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

  1. Read the 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).


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (Click here)
OK


20.READ VALUE USING TECHSTREAM (MAF)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.

  1. Allow the engine to idle until the Coolant Temp reaches 75°C (167°F) or more.

  1. Read MAF with the engine speed at 3000 rpm.

    Standard:
    Between 18.0 gm/s and 27.0 gm/s (shift lever: N; A/C: Off).


NG
Go to step 27
OK


21.CHECK VALVE TIMING

A166451E01

  1. Remove the cylinder head cover LH and RH.

  1. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.

  1. 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.


NG
ADJUST VALVE TIMING (Click here)
OK


22.INSPECT SPARK PLUG

  1. Inspect the spark plug of the misfiring cylinder (Click here).



NG
REPLACE SPARK PLUG (Click here)
OK


23.CHECK FOR SPARK (SPARK TEST)

  1. Perform a spark test (Click here).

    HINT:
    If the result of the spark test is normal, proceed to the next step.

NEXT


24.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


25.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70 AND/OR #80 VOLTAGE)
A136305E22

  1. Disconnect the D74 ECM connector.

  1. Turn the ignition switch to ON.

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D74-86 (#10) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-109 (#20) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-85 (#30) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-108 (#40) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-84 (#50) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-107 (#60) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-83 (#70) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V
    D74-106 (#80) - D74-43 (E01)
    		Ignition switch ON
    		11 to 14 V


NG
GO TO FUEL INJECTOR CIRCUIT (Click here)
OK


26.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

  1. Check the 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


27.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION)

  1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM (Click here).

    HINT:
    Repair any problems.

NEXT


28.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear DTCs (Click here).

  1. Turn the ignition switch off and wait for at least 30 seconds.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Start the engine.

  1. Warm up the engine.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

  1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  1. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.

  1. Check the DTC judgment result.

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


B
END
A


29.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER)

  1. Disconnect the D7 MAF meter connector.

  1. Disconnect the D74 ECM connector.

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

    Standard resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D7-3 (VG) - D74-74 (VG)
    		Always
    		Below 1 Ω
    D7-2 (E2G) - D74-75 (E2G)
    		Always
    		Below 1 Ω
    D7-3 (VG) or D74-74 (VG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


30.REPLACE MASS AIR FLOW METER

  1. Replace the mass air flow meter (Click here).

    HINT:
    If the results of the inspections performed in steps 15 and 20 indicated no problem, proceed to the next step without replacing the mass air flow meter.

NEXT


31.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear DTCs (Click here).

  1. Turn the ignition switch off and wait for at least 30 seconds.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Start the engine.

  1. Warm up the engine.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

  1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  1. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.

  1. Check the DTC judgment result.

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


B
REPLACE ECM (Click here)
A

END 

32.CHECK FUEL LINE

  1. Check the fuel lines for leaks or blockage.



NG
REPAIR OR REPLACE FUEL LINE
OK

REPLACE FUEL PUMP ASSEMBLY (Click here)