Dtc P0300 Random / Multiple Cylinder Misfire Detected. Corolla Auris

DESCRIPTION

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

READ VALUE OF INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)

CHECK PCV HOSE CONNECTIONS

READ VALUE OF INTELLIGENT TESTER

CHECK SPARK PLUG

CHECK FOR SPARK AND IGNITION

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

CHECK FUEL INJECTOR OF MISFIRING CYLINDER

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE OF INTELLIGENT TESTER (MASS AIR FLOW METER)

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE OF INTELLIGENT TESTER (MASS AIR FLOW METER)

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

CHECK SPARK PLUG

CHECK FOR SPARK AND IGNITION (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

CHECK FUEL INJECTOR OF MISFIRING CYLINDER

CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

CHECK FUEL LINE

---

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

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause increases 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 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 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 as when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire rate exceeds the threshold level and could 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 detected (2-trip detection logic)	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Injector Fuel pressure Mass air flow meter Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connection Intake system ECM
P0301 P0302 P0303 P0304	Misfiring of specific cylinder detected (2-trip detection logic)

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.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.
   
2. Turn the ignition switch on (IG).
   
3. Turn the tester on.
   
4. Record the DTC(s) and freeze frame data.
   
5. Using the tester, switch the ECM from normal mode to check mode (See page Нажмите здесь).
   
6. Read the misfire counts of each cylinder (Cylinder #1 to #4) with the engine in an idling condition. If any misfire count is displayed, skip the following confirmation driving pattern.
   
7. 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.
   
   

   УКАЗАНИЕ:

   1. 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	8 minutes or more
   1000	4 minutes 30 seconds or more
   2000	2 minutes 30 seconds or more
   3000	1 minute 30 seconds or more

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

   УКАЗАНИЕ:

   Do not turn the ignition 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.

9. Record the DTC(s), freeze frame data and misfire counts.
   
10. Turn the ignition switch off and wait for at least 5 seconds.
    

INSPECTION PROCEDURE

УКАЗАНИЕ:

1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
   
2. 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 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.
   
4. The problem is complex and involves multiple factors.
   
5. After finishing repairs, check that no misfire occurs in each cylinder (Cylinder #1, #2, #3 and #4).
   
6. Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after the repairs.
   
7. When either Short FT #1 or Long FT #1 values in the freeze frame data is not within 20% of the central value, the air fuel ratio may be rich (-20% or less) or lean (+20% or more).
   
8. 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.
   

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

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Select the following menu items: Powertrain / Engine and ECT / DTC.
   

5. Read the DTCs.
   
   

   Result:

   
   

   Display (DTC Output)	Proceed to
   P0300, P0301, P0302, P0303 and/or P0304	A
   P0300, P0301, P0302, P0303 and/or P0304 and other DTCs	B

   УКАЗАНИЕ:

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

B	GO TO DTC CHART (Нажмите здесь)

A

2.READ VALUE OF INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the tester on.
   

3. Select the following menu items: Powertrain / Engine and ECT / Data List / Misfire RPM and Misfire Load.
   

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

   УКАЗАНИЕ:

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

NEXT

3.CHECK PCV HOSE CONNECTIONS

OK:

PCV hose is correctly connected and is not damaged.

NG	REPAIR OR REPLACE PCV HOSE

OK

4.READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on (Step "C").
   

4. Enter the following menu items: Powertrain / Engine and ECT / Data List / Cylinder #1 (to #4) Misfire Count (Step "D").
   

5. Read each value for Cylinder #1 to #4 displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedures:
   

   1. Start the engine and let it idle.
      

   2. Move the shift lever to the D position.
      

   3. Check Cylinder #1 to #4.
      

   4. If misfire counts are still not displayed, perform steps ("C") and ("D").
      

6. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "READ VALUE USING INTELLIGENT TESTER (Misfire RPM and Misfire Load)" procedures above.
   

7. Read Cylinder #1 to #4 or the DTCs displayed on the tester.
   
   

   Result:

   
   

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

   УКАЗАНИЕ:

   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 engine coolant temperature 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	Перейдите к шагу 18

A

5.CHECK SPARK PLUG

1. Remove the ignition coil and the spark plug of the misfiring cylinder.
   

2. Measure the spark plug electrode gap.
   

   Maximum gap:

   1.0 to 1.1 mm (0.039 to 0.043 in.)
   

3. Check the electrode for carbon deposits.
   

   Recommended spark plug:

   Manufacturer	Product
   DENSO	SC20HR11

   ПРИМЕЧАНИЕ:

   If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

4. Reinstall the ignition coil and the spark plug.
   

NG	REPLACE SPARK PLUG (Нажмите здесь)

OK

6.CHECK FOR SPARK AND IGNITION

1. Perform a spark test.
   

   ПРЕДОСТЕРЕЖЕНИЕ:

   During the test, disconnect all the fuel injector connectors.

   ПРИМЕЧАНИЕ:

   Do not crank the engine for more than 2 seconds.

   1. Remove the ignition coil from the cylinder head.
      

   2. Install the spark plug onto the ignition coil.
      

   3. Disconnect the 4 fuel injector connectors.
      

   4. Touch the spark plug assembly to the cylinder head.
      

   5. Crank the engine for less than 2 seconds and check for spark.
      

      OK:

      Sparks jump across electrode gap.
      

   6. Reconnect the 4 fuel injector connectors.
      

   7. Install the ignition coil.
      

NG	Перейдите к шагу 31

OK

7.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

1. Measure the cylinder compression pressure of the misfiring cylinder (See page Нажмите здесь).
   

NG	CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

8.CHECK INJECTOR ASSEMBLY (POWER SOURCE)

1. Disconnect the injector assembly connector.
   

2. Turn the ignition switch on (IG).
   

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

   Standard voltage:

   Tester Connection	Switch Condition	Specified Condition
   B9-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B10-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B11-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B12-1 - Body ground	Ignition switch on (IG)	9 to 14 V

4. Reconnect the ignition switch connector.
   

NG	CHECK FUEL INJECTOR CIRCUIT

OK

9.CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

1. Disconnect the injector assembly connector.
   

2. Disconnect the ECM connector.
   

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

   Standard resistance (Check for open):

   Tester Connection	Condition	Specified Condition
   B9-2 - B31-108 (#10)	Always	Below 1 Ω
   B10-2 - B31-107 (#20)	Always	Below 1 Ω
   B11-2 - B31-106 (#30)	Always	Below 1 Ω
   B12-2 - B31-105 (#40)	Always	Below 1 Ω

   Standard resistance (Check for short):

   Tester Connection	Condition	Specified Condition
   B9-2 or B31-108 (#10) - Body ground	Always	10 kΩ or higher
   B10-2 or B31-107 (#20) - Body ground	Always	10 kΩ or higher
   B11-2 or B31-106 (#30) - Body ground	Always	10 kΩ or higher
   B12-2 or B31-105 (#40) - Body ground	Always	10 kΩ or higher

4. Reconnect the injector connector.
   

5. Reconnect the ECM connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR ASSEMBLY - ECM)

OK

10.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

1. Disconnect the ECM connector.
   

2. Turn the ignition switch on (IG).
   

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

   Standard voltage:

   Tester Connection	Switch Condition	Specified Condition
   B31-108 (#10) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-107 (#20) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-106 (#30) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-105 (#40) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V

4. Reconnect the ECM connector.
   

NG	Перейдите к шагу 33

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) (See page Нажмите здесь).
   

NG	REPLACE FUEL INJECTOR ASSEMBLY (Нажмите здесь)

OK

12.CHECK INTAKE SYSTEM

1. Check the intake system for vacuum leakage (See page Нажмите здесь).
   

   OK:

   No leakage from intake system.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

13.CHECK FUEL PRESSURE

1. Check the fuel pressure (See page Нажмите здесь).
   

NG	Перейдите к шагу 34

OK

14.READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   

5. 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 95°C (167°F and 203°F).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (Нажмите здесь)

OK

15.READ VALUE OF INTELLIGENT TESTER (MASS AIR FLOW METER)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Select the following menu items: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.
   

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

6. Read the MAF value with the engine at idle and also at 2500 rpm.
   

   Standard:

   MAF value while engine is idling:

   Between 0.54 g/s and 4.33 g/s (shift position: N, A/C: OFF).
   

   MAF value at engine speed of 2500 rpm:

   Between 3.33 g/s and 9.17 g/s (shift position: N, A/C: OFF).
   

NG	REPLACE MASS AIR FLOW METER (Нажмите здесь)

OK

16.ADJUST VALVE TIMING

УКАЗАНИЕ:

There are no marks on the cylinder head for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored links on the timing chain with the marks on the pulleys. It may be necessary to remove and re-install the chain to match up the timing marks (See page Нажмите здесь).

NEXT

17.CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Clear the DTCs (See page Нажмите здесь).
   

5. Start the engine and warm it up.
   

6. Switch the ECM from normal mode to check mode using the tester.
   

7. Run the engine at an engine speed of 1000 rpm for 3 minutes.
   

8. Select the following menu items: Powertrain / Engine and ECT / DTC.
   

9. Read the DTCs.
   

   Result:

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

B	REPLACE ECM (Нажмите здесь)

A
SYSTEM IS OK

18.CHECK INTAKE SYSTEM

1. Check the intake system for vacuum leakage (See page Нажмите здесь).
   

   OK:

   No leakage from intake system.
   

NG	REPAIR OR REPLACE INTAKE SYSTEM

OK

19.CHECK FUEL PRESSURE

1. Check the fuel pressure (See page Нажмите здесь).
   

NG	Перейдите к шагу 34

OK

20.READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
   

5. 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 95°C (167°F and 203°F).
   

NG	REPLACE ENGINE COOLANT TEMPERATURE SENSOR (Нажмите здесь)

OK

21.READ VALUE OF INTELLIGENT TESTER (MASS AIR FLOW METER)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Select the following menu items: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.
   

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

6. Read the MAF value with the engine at idle and also at 2500 rpm.
   

   Standard:

   MAF value while engine is idling:

   Between 0.54 g/s and 4.33 g/s (shift position: N, A/C: OFF).
   

   MAF value at engine speed of 2500 rpm:

   Between 3.33 g/s and 9.17 g/s (shift position: N, A/C: OFF).
   

NG	REPLACE MASS AIR FLOW METER (Нажмите здесь)

OK

22.ADJUST VALVE TIMING

УКАЗАНИЕ:

There are no marks on the cylinder head match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and re-install the chain to match up the timing marks (See page Нажмите здесь).

NEXT

23.CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG).
   

3. Turn the tester on.
   

4. Clear the DTCs (See page Нажмите здесь).
   

5. Start the engine and warm it up.
   

6. Switch the ECM from normal mode to check mode using the tester.
   

7. Run the engine at an engine speed of 1000 rpm for 3 minutes.
   

8. Select the following menu items: Powertrain / Engine and ECT / DTC.
   

9. Read the DTCs.
   

   Result:

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

B	Перейдите к шагу 24

A
SYSTEM IS OK

24.CHECK SPARK PLUG

1. Remove the ignition coil and the spark plug of the misfiring cylinder.
   

2. Measure the spark plug electrode gap.
   

   Maximum gap:

   1.0 to 1.1 mm (0.039 to 0.043 in.)
   

3. Check the electrode for carbon deposits.
   

   Recommended spark plug:

   Manufacturer	Product
   DENSO	SC20HR11

   ПРИМЕЧАНИЕ:

   If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

4. Reinstall the ignition coil and the spark plug.
   

NG	REPLACE SPARK PLUG (Нажмите здесь)

OK

25.CHECK FOR SPARK AND IGNITION (SPARK TEST)

1. Perform a spark test.
   

   ПРЕДОСТЕРЕЖЕНИЕ:

   During the test, disconnect all fuel injector connectors.

   ПРИМЕЧАНИЕ:

   Do not crank the engine for more than 2 seconds.

   1. Remove the ignition coil from the cylinder head.
      

   2. Install the spark plug onto the ignition coil.
      

   3. Disconnect the 4 fuel injector connectors.
      

   4. Touch the spark plug assembly to the cylinder head.
      

   5. Crank the engine for less than 2 seconds and check for spark.
      

      OK:

      Sparks jump across electrode gap.
      

   6. Reconnect the 4 fuel injector connectors.
      

   7. Install the ignition coil.
      

NG	Перейдите к шагу 31

OK

26.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

1. Measure the cylinder compression pressure of the misfiring cylinder (See page Нажмите здесь).
   

NG	CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

27.CHECK INJECTOR ASSEMBLY (POWER SOURCE)

1. Disconnect the injector assembly connector.
   

2. Turn the ignition switch on (IG).
   

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

   Standard voltage:

   Tester Connection	Switch Condition	Specified Condition
   B9-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B10-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B11-1 - Body ground	Ignition switch on (IG)	9 to 14 V
   B12-1 - Body ground	Ignition switch on (IG)	9 to 14 V

4. Reconnect the injector assembly connector.
   

NG	CHECK FUEL INJECTOR CIRCUIT

OK

28.CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

1. Disconnect the injector assembly connector.
   

2. Disconnect the ECM connector.
   

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

   Standard resistance (Check for open):

   Tester Connection	Condition	Specified Condition
   B9-1 - B31-108 (#10)	Always	Below 1 Ω
   B10-1 - B31-107 (#20)	Always	Below 1 Ω
   B11-1 - B31-106 (#30)	Always	Below 1 Ω
   B12-1 - B31-105 (#40)	Always	Below 1 Ω

   Standard resistance (Check for short):

   Tester Connection	Condition	Specified Condition
   B9-1 or B31-108 (#10) - Body ground	Always	10 kΩ or higher
   B10-1 or B31-107 (#20) - Body ground	Always	10 kΩ or higher
   B11-1 or B31-106 (#30) - Body ground	Always	10 kΩ or higher
   B12-1 or B31-105 (#40) - Body ground	Always	10 kΩ or higher

4. Reconnect the injector connector.
   

5. Reconnect the ECM connector.
   

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR ASSEMBLY - ECM)

OK

29.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

1. Disconnect the ECM connector.
   

2. Turn the ignition switch on (IG).
   

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

   Standard voltage:

   Tester Connection	Switch Condition	Specified Condition
   B31-108 (#10) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-107 (#20) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-106 (#30) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V
   B31-105 (#40) - B31-45 (E01)	Ignition switch on (IG)	9 to 14 V

4. Reconnect the ECM connector.
   

NG	Перейдите к шагу 33

OK

30.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (See page Нажмите здесь).
   

NG	REPLACE FUEL INJECTOR ASSEMBLY (Нажмите здесь)

OK
REPLACE ECM (Нажмите здесь)

31.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.
   

   ПРЕДОСТЕРЕЖЕНИЕ:

   During the test, disconnect all injector connectors.

   ПРИМЕЧАНИЕ:

   Do not crank the engine for more than 2 seconds.

   1. Install the spark plug onto the ignition coil.
      

   2. Disconnect the 4 fuel injector connectors.
      

   3. Touch the spark plug assembly to cylinder head.
      

   4. Crank the engine for less than 2 seconds and check for spark.
      

      OK:

      Sparks jump across electrode gap.
      

NG	Перейдите к шагу 32

OK
REPLACE SPARK PLUG (Нажмите здесь)

32.CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

NG	REPLACE ECM (Нажмите здесь)

OK
REPLACE IGNITION COIL (Нажмите здесь)

33.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

1. Disconnect the ECM connector.
   

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   B31-45 (E01) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)

OK
REPLACE INJECTOR ASSEMBLY (Нажмите здесь)

34.CHECK FUEL LINE

1. Check the fuel lines for leaks or blockage (See pageНажмите здесь).
   

NG	REPAIR OR REPLACE FUEL LINE

OK
REPLACE FUEL PUMP ASSEMBLY (Нажмите здесь)

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