Part 2
2GR-FXE ENGINE CONTROL: SFI SYSTEM: P0300-P0306: Random / Multiple Cylinder Misfire Detected
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
(Continued)
14. CHECK FUEL PRESSURE
(a) Check the fuel pressure Fuel System.
NG -- CHECK FUEL LINE
OK -- Continue to next step.
15. READ VALUE USING TECHSTREAM (COOLANT TEMP) P0171
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.
16. READ VALUE USING TECHSTREAM (MAF)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode Component Tests and General Diagnostics.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
(f) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(g) Read MAF with the engine speed at 2500 rpm.
Standard:
Between 6 gm/sec and 17 gm/sec (shift lever: P).
HINT
When the vehicle is stopped, the engine is being raced with the accelerator pedal depressed 60% or more
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
17. CHECK VALVE TIMING
HINT
Check the valve timing P0011.
NG -- ADJUST VALVE TIMING Reassembly
OK -- Continue to next step.
18. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode Component Tests and General Diagnostics.
(e) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more.
HINT
The A/C switch and all accessory switches should be off.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(g) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
HINT
During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in EGR valve.
NG -- INSPECT EGR VALVE ASSEMBLY
OK -- CHECK HARNESS AND CONNECTOR
19. INSPECT EGR VALVE ASSEMBLY
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
(c) Reinstall the EGR valve assembly Installation.
NG -- REPLACE EGR VALVE ASSEMBLY Removal
OK -- CHECK HARNESS AND CONNECTOR
20. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leaks Intake System.
OK:
No leakage in intake system.
NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.
21. CHECK FUEL PRESSURE
(a) Check the fuel pressure Fuel System.
NG -- CHECK FUEL LINE
OK -- Continue to next step.
22. READ VALUE USING TECHSTREAM (COOLANT TEMP) P0171
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.
23. READ VALUE USING TECHSTREAM (MAF)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode Component Tests and General Diagnostics.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
(f) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(g) Read MAF with the engine speed at 2500 rpm.
Standard:
Between 6 gm/sec and 17 gm/sec (shift lever: P).
HINT
When the vehicle is stopped, the engine is being raced with the accelerator pedal depressed 60% or more
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
24. CHECK VALVE TIMING
HINT
Check the valve timing P0011.
NG -- ADJUST VALVE TIMING Reassembly
OK -- Continue to next step.
25. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode Component Tests and General Diagnostics.
(e) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more.
HINT
The A/C switch and all accessory switches should be off.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(g) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
HINT
During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in EGR valve.
NG -- INSPECT EGR VALVE ASSEMBLY
OK -- INSPECT SPARK PLUG
26. INSPECT EGR VALVE ASSEMBLY
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
(c) Reinstall the EGR valve assembly Installation.
NG -- REPLACE EGR VALVE ASSEMBLY Removal
OK -- Continue to next step.
27. INSPECT SPARK PLUG
(a) Inspect the spark plug Testing and Inspection.
NG -- REPLACE SPARK PLUG Removal
OK -- Continue to next step.
28. CHECK FOR SPARKS AND IGNITION
(a) Perform a spark test Testing and Inspection.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
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
OK -- Continue to next step.
29. CHECK CYLINDER COMPRESSION PRESSURE
(a) Measure the cylinder compression pressure of the misfiring cylinder Engine.
NG -- CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK -- Continue to next step.
30. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) Fuel Injector Circuit
NG -- CHECK FUEL INJECTOR CIRCUIT Fuel Injector Circuit
OK -- Continue to next step.
31. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) Fuel Injector Circuit
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
OK -- Continue to next step.
32. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER
(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor) Testing and Inspection.
NG -- REPLACE FUEL INJECTOR ASSEMBLY Removal
OK -- Continue to next step.
33. CHECK HARNESS AND CONNECTOR
(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM Electronic Circuit Inspection Procedure.
HINT
Repair any problems.
NEXT -- Continue to next step.
34. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the power switch off and wait for 30 seconds.
(f) Turn the power switch on (IG) and turn the Techstream on.
(g) Put the engine in inspection mode Component Tests and General Diagnostics.
(h) Start the engine and warm it up.
(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(j) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(k) Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
(l) Check the DTC judgment result.
Result
B -- END
A -- Continue to next step.
35. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
(a) Disconnect the mass air flow meter sub-assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
36. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
(a) Replace the mass air flow meter sub-assembly Removal.
HINT
If the results of the inspections performed in steps 16 and 23 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
NEXT -- Continue to next step.
37. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the power switch off and wait for 30 seconds.
(f) Turn the power switch on (IG) and turn the Techstream on.
(g) Put the engine in inspection mode Component Tests and General Diagnostics.
(h) Start the engine and warm it up.
(i) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(j) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(k) Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
(l) Check the DTC judgment result.
Result
B -- REPLACE ECM Removal
A -- END
38. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
(a) Change the installed spark plug to a spark plug that functions normally.
(b) Perform a spark test Testing and Inspection.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark jumps across electrode gap.
NG -- CHANGE TO NORMAL IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER
OK -- REPLACE SPARK PLUG Removal
39. CHANGE TO NORMAL IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER
(a) Change the installed ignition coil assembly to an ignition coil assembly that functions normally.
(b) Perform a spark test Testing and Inspection.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark jumps across electrode gap.
NG -- REPLACE ECM Removal
OK -- REPLACE IGNITION COIL ASSEMBLY Removal
40. CHECK FUEL LINE
(a) Check the fuel lines for leaks or blockage.
NG -- REPAIR OR REPLACE FUEL LINE
OK -- REPLACE FUEL PUMP Removal