Part 2

2ZR-FXE ENGINE CONTROL: SFI SYSTEM: P0300-P0304: 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

Continued

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

Text in Illustration

(d) Reconnect the fuel injector assembly connectors.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
OK -- Continue to next step.

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

(a) Disconnect the ECM connector.

(b) Turn the power switch on (IG).

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

Standard Voltage:

Text in Illustration

(d) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK -- Continue to next step.

11. 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.

12. CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks Testing and Inspection.

OK:

No leaks in intake system.

NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.

13. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Inspect the mass air flow meter sub-assembly On-Vehicle Inspection.

NG -- REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Removal
OK -- Continue to next step.

14. CHECK FUEL PRESSURE

(a) Check the fuel pressure Testing and Inspection.

NG -- CHECK FUEL LINE
OK -- Continue to next step.

15. READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard value:

With cold engine:

Same as ambient air temperature.

With warm engine:

80 to 100°C (176 to 212°F).

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Service and Repair
OK -- Continue to next step.

16. ADJUST VALVE TIMING

HINT
There are no marks on the cylinder head to 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 reinstall the chain to match-up the alignment marks Disassembly.

Text in Illustration

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Perform confirmation driving pattern.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

(f) Read the pending DTCs.

Result:

B -- END
A -- 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 the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.

OK:

MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.

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 the EGR valve.

Result:

B -- REPLACE ECM
A -- Continue to next step.

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 -- Continue to next step.

20. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- Continue to next step.

21. 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 DTC Check / Clear.

(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 DTCs: P0300, P0301, P0302, P0303, P0304.

(l) Check the DTCs judgment result.

NEXT -- END

22. CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks Testing and Inspection.

OK:

No leaks in intake system.

NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.

23. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Inspect the mass air flow meter sub-assembly On-Vehicle Inspection.

NG -- REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Removal
OK -- Continue to next step.

24. CHECK FUEL PRESSURE

(a) Check the fuel pressure Testing and Inspection.

NG -- CHECK FUEL LINE
OK -- Continue to next step.

25. READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard value:

With cold engine:

Same as ambient air temperature.

With warm engine:

80 to 100°C (176 to 212°F).

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Service and Repair
OK -- Continue to next step.

26. 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 the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.

OK:

MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.

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 the EGR valve.

Result:

B -- INSPECT SPARK PLUG
A -- Continue to next step.

27. 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.

28. INSPECT SPARK PLUG

(a) Remove the ignition coil assembly and the spark plug of the misfiring cylinder.

(b) Check the electrode for carbon deposits.

Recommended Spark Plug

Maximum Electrode Gap for Used Spark Plug:

1.3 mm (0.0512 in.)

If the gap is greater than the maximum, replace the spark plug.

Electrode Gap for New Spark Plug:

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

(d) Reinstall the ignition coil assembly and spark plug.

NG -- REPLACE SPARK PLUG Removal
OK -- Continue to next step.

29. CHECK FOR SPARK (SPARK TEST)

(a) Perform spark test Testing and Inspection.

CAUTION:
Always 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 KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
OK -- Continue to next step.

30. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

(a) Measure the cylinder compression pressure of the misfiring cylinder On-Vehicle Inspection.

NG -- CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK -- Continue to next step.

31. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

(a) Disconnect the fuel injector assembly connectors.

(b) Turn the power switch on (IG).

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

Standard Voltage:

Text in Illustration

(d) Reconnect the fuel injector assembly connectors.

NG -- CHECK FUEL INJECTOR CIRCUIT Removal
OK -- Continue to next step.

32. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY- ECM)

(a) Disconnect the fuel injector assembly connectors.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

Text in Illustration

(d) Reconnect the fuel injector assembly connectors.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
OK -- Continue to next step.

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

(a) Disconnect the ECM connector.

(b) Turn the power switch on (IG).

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

Standard Voltage:

Text in Illustration

(d) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK -- Continue to next step.

34. 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.

35. ADJUST VALVE TIMING

HINT
There are no marks on the cylinder head to 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 reinstall the chain to match-up the alignment marks Disassembly.

Text in Illustration

NEXT -- Continue to next step.

36. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Perform confirmation driving pattern.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

(f) Read the pending DTCs.

Result:

B -- END
A -- Continue to next step.

37. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- Continue to next step.

38. 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 DTC Check / Clear.

(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 DTCs: P0300, P0301, P0302, P0303, P0304.

(l) Check the DTCs judgment result.

NEXT -- END

39. CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

(a) Change the installed spark plug to a known good spark plug.

(b) Perform a spark test Testing and Inspection.

CAUTION:
Always 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 KNOWN GOOD IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

OK -- REPLACE SPARK PLUG Removal

40. CHANGE TO KNOWN GOOD IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

(a) Change the ignition coil assembly to a known good ignition coil assembly.

(b) Perform a spark test Testing and Inspection.

CAUTION:
Always 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

41. CHECK FUEL LINE

(a) Check the fuel lines for leaks or blockage.

NG -- REPAIR OR REPLACE FUEL LINE

OK -- REPLACE FUEL PUMP Removal