Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL
CHECK FOR ANY OTHER DTCS OUTPUT (RECORD STORED DTC AND FREEZE FRAME DATA)
REPAIR OR REPLACE AIR INTAKE SYSTEM
PERFORM ACTIVE TEST USING GTS (OPERATE TURBOCHARGER SUB-ASSEMBLY)
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EGR VALVE CLOSE)
READ VALUE USING GTS (TARGET EGR POS AND ACTUAL EGR VALVE POS)
REMOVE DEPOSIT (EGR VALVE ASSEMBLY)
READ VALUE USING GTS (INJECTION VOLUME)
REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS
REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
CHECK HARNESS AND CONNECTOR (ECM - TURBOCHARGER SUB-ASSEMBLY)
DTC P1251 Turbocharger / Supercharger Overboost Condition (Too High)
DESCRIPTION
- HINT:
- Refer to DTC P0046 ().
DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
Vehicle being driven | Boost pressure is higher than the threshold* for 2 seconds (1 trip detection logic). | Turbocharger sub-assembly VN turbo link stuck malfunction Extremely low battery voltage (P0560 stored simultaneously) Intake system Exhaust system EGR valve assembly EGR cooler EGR system line deposits or clogs Injector assembly Diesel throttle body assembly ECM DPF catalytic converter or CCo catalytic converter cracks or removal |
- HINT:
- *: This value changes based on engine speed, atmospheric pressure, intake air temperature and the engine coolant temperature.
DTC No. | Data List |
P1251 | MAP Target Booster Pressure MAF Target EGR Valve Pos Target EGR Valve Pos #2 Actual EGR Valve Pos Actual EGR Valve Pos #2 Actual VN Turbo Position Actual VN Turbo Position #2 Atmosphere Pressure |
- HINT:
- If DTC P1251 is stored due to the VN turbo vane being stuck closed, the following symptoms may appear:
WIRING DIAGRAM
Refer to DTC P0046 ().
Refer to DTC P2564 ().
INSPECTION PROCEDURE
- NOTICE:
- HINT:
- Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK FOR ANY OTHER DTCS OUTPUT (RECORD STORED DTC AND FREEZE FRAME DATA) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Enter the following menus: Engine and ECT / Trouble Codes.
Read the DTCs.
- HINT:
Result | Proceed to |
P1251 is output | A |
P1251 and other DTCs are output | B |
- HINT:
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A | |
2.CHECK AIR INTAKE SYSTEM |
Check if the hoses between the air cleaner and turbocharger, and turbocharger and intake manifold are damaged or disconnected.
Result | Proceed to |
Hoses or pipes are damaged or disconnected | A |
No hoses or pipes are damaged or disconnected | B |
- HINT:
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A | |
3.REPAIR OR REPLACE AIR INTAKE SYSTEM |
Repair or replace the malfunctioning part in the air intake system.
NEXT | |
4.PERFORM ACTIVE TEST USING GTS (OPERATE TURBOCHARGER SUB-ASSEMBLY) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Engine and ECT / Active Test / Test the Turbo Charger Step Motor (Test the Turbo Charger Step Motor #2) / Data List / Target VN Turbo Position (Target VN Turbo Position #2) and Actual VN Turbo Position (Actual VN Turbo Position #2).
While changing the Active Test value to 20, 95, 60 and 20%, check that Actual VN Turbo Position (Actual VN Turbo Position #2) smoothly changes to the set opening amount.
- NOTICE:
- When moving the vanes toward the fully closed position, make sure that Actual VN Turbo Position (Actual VN Turbo Position #2) does not become 5% or less.
- OK:
- The Actual VN Turbo Position (Actual VN Turbo Position #2) value follows the Target VN Turbo Position (Target VN Turbo Position #2).
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OK | |
5.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EGR VALVE CLOSE) |
Connect the GTS to the DLC3.
Start the engine and warm it up, and make sure the A/C switch and all accessory switches are off.
Turn the engine switch off. Wait for 30 seconds, and then restart the engine.
Turn the GTS on.
Enter the following menus: Engine and ECT / Data List / MAF.
Read the MAF value displayed on the GTS while the engine is idling.
Enter the following menus: Engine and ECT / Active Test / Activate the EGR Valve Close.
Read the MAF value when the EGR valve is closed using the Active Test function.
- HINT:
Active Test | Result | Proceed to |
Activate the EGR Valve Close: Off (Open) to On (Closed) | MAF value does not change | A |
MAF value changes | B |
- NOTICE:
- As the measured values may differ from those shown below due to factors such as differences in measuring environments and changes in vehicle condition due to aging, do not use these values to determine whether the vehicle is malfunctioning or not.
- HINT:
- The problem may be a temporary one, due to the entry of deposits or foreign matter. Check that there are no deposits or foreign matter in the EGR valve assembly or mass air flow meter.
- Reference:
EGR Valve Condition (Opening) Measuring Condition MAF (Reference) Open (40%) Atmosphere pressure: 101 kPaIntake air temperature: 30°C (86°F)Engine coolant temperature: 88°C (190°F)3 to 10 gm/sec Closed (0%) 14 to 23 gm/sec
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A | |
6.READ VALUE USING GTS (TARGET EGR POS AND ACTUAL EGR VALVE POS) |
Check the change in the values of "Target EGR Valve Pos (Target EGR Valve Pos #2)" and "Actual EGR Valve Pos (Actual EGR Valve Pos #2)" in the Data List from the time when the "Control the EGR Step Position (Control the EGR Step Position #2)" or "Activate the EGR valve Close" Active Test was performed in the previous step.
Result | Proceed to |
Even though "Target EGR Valve Pos (Target EGR Valve Pos #2)" indicated that the system was commanding the valve to open, "Actual EGR Valve Pos (Actual EGR Valve Pos #2)" remained near 0% and did not change | A |
Other than above ("Actual EGR Valve Pos (Actual EGR Valve Pos #2)" changed according to the EGR valve open/close commands of the Active Test) | B |
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A | |
7.REMOVE DEPOSIT (EGR VALVE ASSEMBLY) |
Remove the No. 1 and No. 2 EGR valve assembly ().
Visually check the No. 1 and No. 2 EGR valve assembly for deposits. If there are deposits, clean the No. 1 and No. 2 EGR valve assembly.
- NOTICE:
- HINT:
Reinstall the EGR valve assembly ().
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8.REPLACE EGR COOLER |
Replace the EGR cooler ().
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9.READ VALUE USING GTS (INJECTION VOLUME) |
Connect the GTS to the DLC3.
Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher.
Allow the engine to idle for 1 minute or more.
- HINT:
- The A/C switch and all accessory switches should be off with a fully warm engine.
Turn the GTS on.
Enter the following menus: Engine and ECT / Data List / Injection Volume.
Check the value of Injection Volume at 4000 rpm without load.
Result | Proceed to |
Injection Volume is less than 9 mm3/st | A |
Except above | B |
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A | |
10.REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS |
Replace the injector assemblies ().
- NOTICE:
NEXT | |
11.BLEED AIR FROM FUEL SYSTEM |
Bleed the air from the fuel system ().
Perform PM forced regeneration ().
- HINT:
- When fuel lines are disconnected, air may enter the fuel lines, leading to engine starting trouble. Therefore, perform forced regeneration and bleed the air from the fuel lines.
NEXT | |
12.REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING |
Register the injector compensation code ().
Perform the injector pilot quantity learning ().
NEXT | |
13.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the GTS to the DLC3.
Clear the DTCs ().
Turn the engine switch off.
Start the engine and warm it up.
Confirm the value of Engine Speed from the Freeze Frame Data recorded previously, and then drive the vehicle according to the Engine Speed value.
- HINT:
- Take a snapshot of "MAP" and "Target Boost Pressure" in the Data List with the GTS while driving the vehicle.
Read the DTCs.
Result | Proceed to |
P1251 is not output and the amount by which MAP exceeds Target Boost Pressure is 20 kPa or less | A |
Except above | B* |
- HINT:
- *: Return to "Check Air Intake System" and inspect areas that have not been inspected yet.
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A | ||
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14.CHECK HARNESS AND CONNECTOR (ECM - TURBOCHARGER SUB-ASSEMBLY) |
Disconnect the DC motor connector.
Disconnect the nozzle vane position sensor 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 C90-2 (M+) - C45-86 (M+) Always Below 1 Ω C90-1 (M-) - C45-85 (M-) Always Below 1 Ω C89-3 (VNVC) - C45-120 (VNVC) Always Below 1 Ω C89-2 (VNE2) - C45-97 (VNE2) Always Below 1 Ω C89-1 (VTA1) - C45-74 (VNA) Always Below 1 Ω z67-2 (M2+) - C45-18 (VN2+) Always Below 1 Ω z67-1 (M2-) - C45-41 (VN2-) Always Below 1 Ω z66-3 (VNC2) - C45-120 (VNVC) Always Below 1 Ω z66-2 (VE2) - C45-97 (VNE2) Always Below 1 Ω z66-1 (VTI2) - C45-117 (VNA2) Always Below 1 Ω C90-2 (M+) or C45-86 (M+) - Body ground Always 10 kΩ or higher C90-1 (M-) or C45-85 (M-) - Body ground Always 10 kΩ or higher C89-3 (VNVC) or C45-120 (VNVC) - Body ground Always 10 kΩ or higher C89-1 (VTA1) or C45-74 (VNA) - Body ground Always 10 kΩ or higher z67-2 (M2+) or C45-18 (VN2+) - Body ground Always 10 kΩ or higher z67-1 (M2-) or C45-41 (VN2-) - Body ground Always 10 kΩ or higher z66-3 (VNC2) or C45-120 (VNVC) - Body ground Always 10 kΩ or higher z66-1 (VTI2) or C45-117 (VNA2) - Body ground Always 10 kΩ or higher for RHD Tester Connection Condition Specified Condition C90-2 (M+) - C46-86 (M+) Always Below 1 Ω C90-1 (M-) - C46-85 (M-) Always Below 1 Ω C89-3 (VNVC) - C46-120 (VNVC) Always Below 1 Ω C89-2 (VNE2) - C46-97 (VNE2) Always Below 1 Ω C89-1 (VTA1) - C46-74 (VNA) Always Below 1 Ω z67-2 (M2+) - C46-18 (VN2+) Always Below 1 Ω z67-1 (M2-) - C46-41 (VN2-) Always Below 1 Ω z66-3 (VNC2) - C46-120 (VNVC) Always Below 1 Ω z66-2 (VE2) - C46-97 (VNE2) Always Below 1 Ω z66-1 (VTI2) - C46-117 (VNA2) Always Below 1 Ω C90-2 (M+) or C46-86 (M+) - Body ground Always 10 kΩ or higher C90-1 (M-) or C46-85 (M-) - Body ground Always 10 kΩ or higher C89-3 (VNVC) or C46-120 (VNVC) - Body ground Always 10 kΩ or higher C89-1 (VTA1) or C46-74 (VNA) - Body ground Always 10 kΩ or higher z67-2 (M2+) or C46-18 (VN2+) - Body ground Always 10 kΩ or higher z67-1 (M2-) or C46-41 (VN2-) - Body ground Always 10 kΩ or higher z66-3 (VNC2) or C46-120 (VNVC) - Body ground Always 10 kΩ or higher z66-1 (VTI2) or C46-117 (VNA2) - Body ground Always 10 kΩ or higher
Reconnect the DC motor connector.
Reconnect the nozzle vane position sensor connector.
Reconnect the ECM connector.
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OK | ||
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