Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1GR-FE ENGINE CONTROL
CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)
READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD)
READ VALUE USING GTS (MISFIRE COUNT)
CHECK CYLINDER COMPRESSION PRESSURE
CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)
CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER
READ VALUE USING GTS (COOLANT TEMP)
READ VALUE USING GTS (COOLANT TEMP)
CHECK CYLINDER COMPRESSION PRESSURE
CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER
CHECK WHETHER DTC OUTPUT RECURS
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
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
DESCRIPTION

*1 | VVT Sensor |
*2 | Crankshaft Position Sensor |
*3 | ECM |
When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emissions levels. High concentrations of HC can also cause increases in the Three-way Catalytic Converter (TWC) temperature, which may cause damage to the Three-way Catalytic Converter (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 Three-way Catalytic Converter (TWC) reaches the point of thermal degradation, the MIL blinks. To monitor misfires, the ECM uses both the VVT sensor and the crankshaft position sensor. The VVT sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. A misfire is counted when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire rate exceeds the threshold, the ECM illuminates the MIL and stores a DTC.
DTC No. | DTC Detection Condition | Trouble Area |
P0300 | Simultaneous misfiring of several cylinders occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately). An emission deterioration misfire occurs (MIL illuminates). | Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Fuel injector assembly Fuel pressure Mass air flow meter Engine coolant temperature sensor Compression pressure Valve timing PCV valve and hose PCV hose connections Intake system ECM |
P0301 P0302 P0303 P0304 P0305 P0306 | Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic): A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately). An emission deterioration misfire occurs (MIL illuminates). |
When multiple DTCs for misfiring cylinders are stored, but DTC P0300 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring cylinders are detected at the same time.
MONITOR DESCRIPTION
The ECM illuminates the MIL and stores a DTC when the following condition, which could cause emission deterioration, is detected (2 trip detection logic).
The ECM flashes the MIL (immediate detection logic) and stores a DTC (2 trip detection logic) when the following conditions, which could cause damage to the three-way catalytic converter, is detected.
WIRING DIAGRAM
Refer to DTC P0102 ().
Refer to DTC P0351 ().
Refer to Fuel Injector Circuit ().
CONFIRMATION DRIVING PATTERN
- 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 Speed | Duration |
Idling | 8.0 minutes or more |
1000 | 4.5 minutes or more |
2000 | 2.5 minutes or more |
3000 | 1.5 minutes or more |
- 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.
INSPECTION PROCEDURE
- HINT:
In the event of DTC P0300 being output, perform the following operations:
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result | Proceed to |
P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 is output | A |
P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs are output | B |
- HINT:
- If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and P0306 are output, troubleshoot those DTCs first.
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A | |
2.CHECK PCV HOSE CONNECTIONS |
Check the PCV hose (w/ secondary air injection system) connections ().
Check the PCV hose (w/o secondary air injection system) connections ().
- OK:
- PCV hose is connected correctly and is not damaged.
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OK | |
3.READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Misfire RPM and Misfire Load.
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 GTS |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.
Read the value displayed on the GTS.
Data List | GTS Display | Proceed to |
Catalyst OT MF F/C | AVAIL (Avail) | A |
NOT AVL (Not Avl) | B |
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A | |
5.PERFORM ACTIVE TEST USING GTS |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs ().
Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.
Perform the Active Test.
- NOTICE:
- When performing the Active Test, make sure the vehicle is stopped and the engine is either idling or being revved at 3000 rpm or less.
NEXT | |
6.READ VALUE USING GTS (MISFIRE COUNT) |
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Cylinder #1 Misfire Count, #2, #3, #4, #5 and #6.
Allow the engine to idle.
Read the values for Cylinder #1 Misfire Count to Cylinder #6 Misfire Count displayed on the GTS. If no misfires are counted in any cylinders, perform the following procedure:
Move the shift lever to D.
Check Cylinder #1 Misfire Count to Cylinder #6 Misfire Count.
If misfires are still not being counted, perform procedures "A" and "B", and then check the misfire counts again.
Procedure A: Drive the vehicle while matching the vehicle conditions to the Misfire RPM and Misfire Load values noted in the "Read Value Using GTS (Misfire RPM and Misfire Load)" procedure above.
Procedure B: Read Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or the DTCs output on the GTS.
Result | Proceed to |
Most misfires occur in only 1 or 2 cylinders | A |
3 cylinders or more have equal misfire counts | B |
- HINT:
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A | |
7.INSPECT SPARK PLUG |
Inspect the spark plug of the misfiring cylinder ().
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OK | |
8.CHECK FOR SPARKS AND IGNITION |
Perform a spark test ().
- HINT:
- If the result of the spark test is normal, proceed to the next step.
NEXT | |
9.CHECK CYLINDER COMPRESSION PRESSURE |
Measure the cylinder compression pressure of the misfiring cylinder ().
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OK | |
10.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) |

Disconnect the fuel injector assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Cylinder Tester Connection Switch Condition Specified Condition No. 1 C5-1 - Body ground Ignition switch ON 11 to 14 V No. 2 C16-1 - Body ground Ignition switch ON 11 to 14 V No. 3 C7-1 - Body ground Ignition switch ON 11 to 14 V No. 4 C14-1 - Body ground Ignition switch ON 11 to 14 V No. 5 C9-1 - Body ground Ignition switch ON 11 to 14 V No. 6 C12-1 - Body ground Ignition switch ON 11 to 14 V
*a | Front view of wire harness connector (to Fuel Injector Assembly) |
Turn the ignition switch off.
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OK | |
11.CHECK HARNESS AND CONNECTOR |
Disconnect the fuel injector assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD Cylinder Tester Connection Condition Specified Condition No. 1 C5-2 - Body ground Always 10 kΩ or higher C5-2 - C45-86 (#10) Always Below 1 Ω No. 2 C16-2 - Body ground Always 10 kΩ or higher C16-2 - C45-109 (#20) Always Below 1 Ω No. 3 C7-2 - Body ground Always 10 kΩ or higher C7-2 - C45-85 (#30) Always Below 1 Ω No. 4 C14-2 - Body ground Always 10 kΩ or higher C14-2 - C45-108 (#40) Always Below 1 Ω No. 5 C9-2 - Body ground Always 10 kΩ or higher C9-2 - C45-84 (#50) Always Below 1 Ω No. 6 C12-2 - Body ground Always 10 kΩ or higher C12-2 - C45-107 (#60) Always Below 1 Ω for RHD Cylinder Tester Connection Condition Specified Condition No. 1 C5-2 - Body ground Always 10 kΩ or higher C5-2 - C46-86 (#10) Always Below 1 Ω No. 2 C16-2 - Body ground Always 10 kΩ or higher C16-2 - C46-109 (#20) Always Below 1 Ω No. 3 C7-2 - Body ground Always 10 kΩ or higher C7-2 - C46-85 (#30) Always Below 1 Ω No. 4 C14-2 - Body ground Always 10 kΩ or higher C14-2 - C46-108 (#40) Always Below 1 Ω No. 5 C9-2 - Body ground Always 10 kΩ or higher C9-2 - C46-84 (#50) Always Below 1 Ω No. 6 C12-2 - Body ground Always 10 kΩ or higher C12-2 - C46-107 (#60) Always Below 1 Ω
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OK | |
12.CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER |
Check the fuel injector injection [whether fuel volume is high or low, and whether injection pattern is poor] ().
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OK | |
13.CHECK INTAKE SYSTEM |
Check the intake system for vacuum leakage ().
- OK:
- No leakage in intake system.
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OK | |
14.CHECK FUEL PRESSURE |
Check the fuel pressure ().
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OK | |
15.READ VALUE USING GTS (COOLANT TEMP) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
Read 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).
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OK | |
16.READ VALUE USING GTS (MAF) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
Read MAF with the engine speed at 3000 rpm.
- Standard:
- Between 18.3 gm/s and 25.8 gm/s (shift lever: N; A/C: off).
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OK | |
17.CHECK VALVE TIMING |

Remove the cylinder head cover RH and LH.
*1 | Timing Mark |
Turn the crankshaft pulley and align its groove with the "0" timing mark on the timing chain cover.
Check that the timing marks on the camshaft timing gears are aligned with the timing marks of the bearing cap as shown in the illustration.
- OK:
- Timing marks on camshaft timing gears are aligned as shown in the illustration.
Reinstall the cylinder head cover RH and LH.
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18.CHECK INTAKE SYSTEM |
Check the intake system for vacuum leakage ().
- OK:
- No leakage in intake system.
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OK | |
19.CHECK FUEL PRESSURE |
Check the fuel pressure ().
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OK | |
20.READ VALUE USING GTS (COOLANT TEMP) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
Read 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).
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OK | |
21.READ VALUE USING GTS (MAF) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
Read MAF with the engine speed at 3000 rpm.
- Standard:
- Between 18.3 gm/sec and 25.8 gm/sec (shift lever: N; A/C: off).
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OK | |
22.CHECK VALVE TIMING |

Remove the cylinder head cover RH and LH.
*1 | Timing Mark |
Turn the crankshaft pulley and align its groove with the "0" timing mark on the timing chain cover.
Check that the timing marks on the camshaft timing gears are aligned with the timing marks of the bearing cap as shown in the illustration.
- OK:
- Timing marks on camshaft timing gears are aligned as shown in the illustration.
Reinstall the cylinder head cover RH and LH.
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OK | |
23.INSPECT SPARK PLUG |
Inspect the spark plug of the misfiring cylinder ().
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OK | |
24.CHECK FOR SPARKS AND IGNITION |
Perform a spark test ().
- HINT:
- If the result of the spark test is normal, proceed to the next step.
NEXT | |
25.CHECK CYLINDER COMPRESSION PRESSURE |
Measure the cylinder compression pressure of the misfiring cylinder ().
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OK | |
26.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) |

Disconnect the fuel injector assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Cylinder Tester Connection Switch Condition Specified Condition No. 1 C5-1 - Body ground Ignition switch ON 11 to 14 V No. 2 C16-1 - Body ground Ignition switch ON 11 to 14 V No. 3 C7-1 - Body ground Ignition switch ON 11 to 14 V No. 4 C14-1 - Body ground Ignition switch ON 11 to 14 V No. 5 C9-1 - Body ground Ignition switch ON 11 to 14 V No. 6 C12-1 - Body ground Ignition switch ON 11 to 14 V
*a | Front view of wire harness connector (to Fuel Injector Assembly) |
Turn the ignition switch off.
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OK | |
27.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) |
Disconnect the fuel injector assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD Cylinder Tester Connection Condition Specified Condition No. 1 C5-2 - Body ground Always 10 kΩ or higher C5-2 - C45-86 (#10) Always Below 1 Ω No. 2 C16-2 - Body ground Always 10 kΩ or higher C16-2 - C45-109 (#20) Always Below 1 Ω No. 3 C7-2 - Body ground Always 10 kΩ or higher C7-2 - C45-85 (#30) Always Below 1 Ω No. 4 C14-2 - Body ground Always 10 kΩ or higher C14-2 - C45-108 (#40) Always Below 1 Ω No. 5 C9-2 - Body ground Always 10 kΩ or higher C9-2 - C45-84 (#50) Always Below 1 Ω No. 6 C12-2 - Body ground Always 10 kΩ or higher C12-2 - C45-107 (#60) Always Below 1 Ω for RHD Cylinder Tester Connection Condition Specified Condition No. 1 C5-2 - Body ground Always 10 kΩ or higher C5-2 - C46-86 (#10) Always Below 1 Ω No. 2 C16-2 - Body ground Always 10 kΩ or higher C16-2 - C46-109 (#20) Always Below 1 Ω No. 3 C7-2 - Body ground Always 10 kΩ or higher C7-2 - C46-85 (#30) Always Below 1 Ω No. 4 C14-2 - Body ground Always 10 kΩ or higher C14-2 - C46-108 (#40) Always Below 1 Ω No. 5 C9-2 - Body ground Always 10 kΩ or higher C9-2 - C46-84 (#50) Always Below 1 Ω No. 6 C12-2 - Body ground Always 10 kΩ or higher C12-2 - C46-107 (#60) Always Below 1 Ω
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OK | |
28.CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER |
Check the fuel injector injection [whether fuel volume is high or low, and whether injection pattern is poor] ().
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OK | |
29.CHECK HARNESS AND CONNECTOR |
Check the connection and terminal contact pressure of the connectors and wire harnesses between the mass air flow meter and ECM ().
- HINT:
- Repair any problems.
NEXT | |
30.CHECK WHETHER DTC OUTPUT RECURS |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs ().
Turn the ignition switch off.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and warm it up.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
Check the DTC judgment result.
Result | Proceed to |
ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 is output) | A |
NORMAL (No DTC is output) | B |
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A | |
31.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
Disconnect the mass air flow meter connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD Tester Connection Condition Specified Condition C50-5 (VG) - C45-74 (VG) Always Below 1 Ω C50-4 (E2G) - C45-75 (E2G) Always Below 1 Ω C50-5 (VG) or C45-74 (VG) - Body ground Always 10 kΩ or higher for RHD Tester Connection Condition Specified Condition C50-5 (VG) - C46-74 (VG) Always Below 1 Ω C50-4 (E2G) - C46-75 (E2G) Always Below 1 Ω C50-5 (VG) or C46-74 (VG) - Body ground Always 10 kΩ or higher
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OK | |
32.REPLACE MASS AIR FLOW METER |
Replace the mass air flow meter ().
- HINT:
- If the results of the inspections performed in steps 16 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter.
NEXT | |
33.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs ().
Turn the ignition switch off.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and warm it up.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
Check the DTC judgment result.
Result | Proceed to |
NORMAL (No DTC is output) | A |
ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 is output) | B |
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A | ||
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34.CHECK FUEL LINE |
Check the fuel lines for leaks or blockage.
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OK | ||
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