Part 2
2GR-FSE ENGINE CONTROL: SFI SYSTEM: P0300-P0306: Random / Multiple Cylinder Misfire Detected (Continued)
P0306 - Cylinder 6 Misfire Detected
15. INSPECT MASS AIR FLOW METER
(a) Inspect the mass air flow meter On-Vehicle Inspection.
NG -- REPLACE MASS AIR FLOW METER Removal
OK -- REPLACE ECM Removal
16. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leaks Testing and Inspection.
OK:
No leaks in the intake system.
NG -- REPAIR OR REPLACE INTAKE SYSTEM Testing and Inspection
OK -- Continue to next step.
17. CHECK VALVE TIMING
(a) Check valve timing Reassembly.
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
18. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
(a) Check the fuel pressure (low pressure side) Testing and Inspection.
NG -- CHECK FUEL PUMP OPERATION
OK -- Continue to next step.
19. READ VALUE USING TECHSTREAM (COOLANT TEMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
(e) Read the Data List twice when the engine is both cold and warmed up.
Standard:
With cold engine
Same as ambient air temperature.
With warm engine
Between 75°C and 95°C (167°F and 203°F).
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK -- Continue to next step.
20. INSPECT MASS AIR FLOW METER
(a) Inspect the mass air flow meter On-Vehicle Inspection.
NG -- REPLACE MASS AIR FLOW METER Removal
OK -- Continue to next step.
21. CHECK SPARK PLUG
(a) Remove the ignition coil and the spark plug of the misfiring cylinder.
(b) Measure the spark plug electrode gap.
Standard gap:
1.0 to 1.4 mm (0.039 to 0.055 in.)
(c) Check the electrode for carbon deposits.
Recommended Spark Plug
NOTICE:
If the electrode gap is larger than 1.4 mm (0.055 in.), replace the spark plug. Do not adjust the electrode gap.
(d) Reinstall the ignition coil and spark plug.
NG -- REPLACE SPARK PLUG Removal
OK -- Continue to next step.
22. CHECK FOR SPARK AND IGNITION
(a) Disconnect the injector connectors, in order to prevent the engine from starting.
(b) Install the spark plug to the ignition coil.
(c) Attach the spark plug assembly to the cylinder head cover.
(d) Crank the engine for less than 2 seconds and check the spark.
OK:
Sparks jump across the electrode gap.
(e) Reconnect the injector connectors.
NG -- CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
OK -- Continue to next step.
23. CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
(a) Measure the cylinder compression pressure of the misfiring cylinder Engine.
NG -- CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK -- REPLACE ECM Removal
24. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
(a) Check the fuel pressure (low pressure side) Testing and Inspection.
NG -- CHECK FUEL PUMP OPERATION
OK -- REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Removal
25. CHECK FUEL PRESSURE SENSOR
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) While revving the engine, check that the fuel pressure fluctuates.
Standard:
Idling
3 to 5 MPa
2000 rpm (No load)
7 to 9 MPa
HINT
The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.
NG -- CHECK MISFIRE COUNT
OK -- Continue to next step.
26. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection way / Direct.
HINT
The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.
(d) Read the value.
(1) Enter the following menus: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).
Result:
D -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) Removal
C -- REPLACE ECM Removal
B -- REPLACE FUEL PRESSURE SENSOR
A -- REPLACE FUEL PRESSURE SENSOR
27. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
(a) Disconnect the injector connectors, in order to prevent the engine from starting.
(b) Install the spark plug to the ignition coil.
(c) Attach the spark plug assembly to the cylinder head cover.
(d) Crank the engine for less than 2 seconds and check the spark.
OK:
Sparks jump across the electrode gap.
(e) Reconnect the injector connectors.
NG -- CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
OK -- REPLACE SPARK PLUG Removal
28. CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
(a) Disconnect the injector connectors, in order to prevent the engine from starting.
(b) Install the spark plug to the ignition coil.
(c) Attach the spark plug assembly to the cylinder head cover.
(d) Crank the engine for less than 2 seconds and check the spark.
OK:
Sparks jump across the electrode gap.
(e) Reconnect the injector connectors.
NG -- REPLACE ECM Removal
OK -- REPLACE IGNITION COIL ASSEMBLY Removal
29. CHECK FUEL PUMP OPERATION
(a) Check the fuel pump operation Testing and Inspection.
NG -- REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT
OK -- Continue to next step.
30. CHECK FUEL LINE
(a) Check the fuel line for leakage and blockage.
NG -- REPAIR OR REPLACE FUEL LINE
OK -- CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP REGULATOR, FUEL FILTER)
31. CHECK MISFIRE COUNT
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
(e) Allow the engine to idle.
(f) Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #6 Misfire Count.
If no misfire counts occur for any of the cylinders, perform the following procedure:
(1) Move the shift lever to D.
(2) Monitor all of the misfire count values that are displayed on the Techstream.
Result:
B -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Removal
A -- Continue to next step.
32. INSPECT INJECTOR DRIVER
(a) Turn the engine switch off.
(b) Replace the injector drivers with normal ones from another vehicle.
NOTICE:
Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.
(c) Connect the Techstream to the DLC3.
(d) Start the engine.
(e) Clear the DTCs DTC Check / Clear.
(f) Perform the driving test.
(g) Enter the following menus: Powertrain / Engine / Trouble Codes.
(h) Read the DTCs.
Result:
B -- REPLACE INJECTOR DRIVER Removal
A -- Continue to next step.
33. INSPECT FUEL RELIEF VALVE ASSEMBLY
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) Record the Fuel Press value.
(f) Turn the engine switch off.
(g) Wait for 10 seconds.
(h) Turn the engine switch on (IG) and turn the Techstream on.
(i) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(j) Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream.
Result:
B -- REPLACE FUEL RELIEF VALVE ASSEMBLY
A -- REPLACE FUEL PUMP ASSEMBLY (HIGH PRESSURE) Removal