1JZGTE VVT Welcome Pack

1JZGTE VVT Welcome Pack

Hints and Tips

Here are a few useful Hints and Tips for your installation.

When you encounter a problem always check your codes first as this could point directly to a sensor or component that is causing your problem.


  1. Earth Earth Earth: Always earth the following components. The block with your thick Battery negative cable. The cylinder heads ( There are open threaded holes at the back of the cylinder heads on both sides next to where the harness is earthed to the engine.) This will ensure that there are no electrical problems with either the injectors, coils, throttle body or airflow meter.
  2. Fuel Regulation: Please be advised this engine does not have a fuel regulator built into the system like the old 1UZFE VVTi.Therefore you will be required to place a regulator in your fuel system. The Engine requires a pressure of 3.2 br of fuel pressure. If you want you can use a VW Fuel Filter with built in regulator. These units come in a 3 bar, 4 bar or 6.4 bar. Please be advised you are looking for the 3 Bar regulator and it is stamped into the unit itself for identification.
  3. Fuel Pumps: We can supply an original LEXUS Fuel Pump if required. The specifications of this pump are the following 8 Bar and 255 Litres per hour. We obviously recommend using the Lexus Fuel pump as this keeps the unit standard and you know that there is no compatibility issues.
  4. Temperature Gauge: There is a temperature sender to the left of the throttle body with 2 wires coming out of it. This is for the ECU and SHOULD NOT be tampered with in any way to ensure the correct running of the engine. There is a bolt underneath this temperature sender and this is where you can place your temperature sender to provide your cluster with a signal. We advise that you use the original temperature sensor from you vehicle or the sender unit supplied for your gauge as this will ensure no compatibility issues.
  5. Airflow Meter: Please be advised the airflow meter is a very sensitive piece of equipment. The following things will cause it to not read the airflow properly. Bends just before the airflow meter (We advise if possible that you place the Airflow meter directly into your air box if possible). Dust build up caused by the free flowing nature of cone filters. If you have a cone filter then you will be required to regularly clean out the airflow meter with electrical contact cleaner to ensure that the dust build up does not affect running performance ( Major symptom of dust build up is decreased fuel economy). A common problem we come across is the airflow meter being installed the wrong way around. If the engine starts and dies immediately check the direction of the airflow meter.
  6. Alternator: In the Rear Harness 1UZ-FE VVT-i you are required to wire the 3 wires at the back of the alternator. There are 2 wires with a tracer (Usually Black/Red and White/Blue) these wires must be joined together and be given an ignition 12v source. The solid colour (Usually White or Yellow) is your alternator light. This must be taken to your cluster and a Diode placed in the wire as we have come across some vehicles that provide a feedback from the cluster causing the Regulator/Rectifier to remain on permanently and consequently burn itself out causing alternator failure. Your main alternator cable should be fused and this can be done via connecting it to your vehicles existing main fuse box. If this is the case then we must remind you that it is an 80 AMP alternator and the Original Lexus vehicle required a 150AMP Alternator Fuse. You must make sure that your fuse is adequate to ensure the safety of the system.
  7. Gearbox: PLEASE TAKE NOTE ONLY TOYOTA TYPE T-IV Oil must be used in the gearbox of the 1UZ-FE VVT-i, 3UZ-FE VVT-i 5 Speed and Toyota Type WS Oil must be used in the 3UZ-FE VVT-i 6 Speed. Use of any other oil will cause damage to your gearbox. If you research this you will see that it causes your clutches to burn out and there is no available alternative to this oil. Lextreme does carry stock of this oil and we will be able to provide it to you.
  8. Engine Mountings: In all our years experience we have learned that you need to mount the engine with 45 degree mounts this will ensure a long life of your mount. If the engine is mounted upright then it may cause the mount on one side to break. Lextreme offers an entire Laser Cut engine mounting system that will ensure that your engine is mounted the best way possible. We also supply gearbox mounts as well to ensure that your gearbox is mounted properly as well.
  9. Oil Filters: We have seen over the years the use of a GUD Filter that is much shorter than the original Toyota Filter. We have also noticed that clients that use this filter suffer from oil starvation. If your oil filter placement is an issue We advise you to use an oil filter relocation kit and avoid using this smaller oil filter. There is a part from Renault that will allow your oil filter to be mounted 90 degrees from its original position.
  10. Cooling Fans: When it comes to cooling fans you have multiple options. Our personal choice is to use the viscous fan and we have 2 options of viscous fan. The original Lexus option or a smaller more compact viscous fan that we can supply as well. If you choose to use electric fans then we advise that you stick to OEM equipment. We have noticed that the familiar Midas/AutoZone fans that you can purchase are just not sufficient enough to cool the system down.
  11. Radiators: We recommend either a Toyota Hilux 3.0 KZ-TE Radiator or a BMW 740 Radiator. These are tried and tested units that we know work. Otherwise if you can source a radiator that came from either a V8 powered vehicle above 4.0L then these should also suffice.
  12. Oil Coolers: Your Lexus Auto Gearbox does require an oil cooler. We advise nothing smaller than a 10 row oil cooler or an oil cooler that is built into your radiator.
  13. Engine Harness: Please do not extend the wires of your engine harness. Some of these wires are shielded wires and lengthening of these wires can cause a malfunction of your system.
  14. ECU: Please make sure that your ECU is Sealed from any water and heat. The unit itself will heat up during operation and we advise you allow for adequate airflow to the unit to allow it to remain at normal operating temperatures. Under No Circumstances should you place your ECU open in the engine bay as this will result in ECU failure.
  15. Exhaust Manifolds: Your engine comes supplied with exhaust manifolds and its accompanying heat shields. If for whatever reason you cannot fit these units in your vehicle due to space restrictions we advise that you get narrow manifolds from either Viper Exhausts or any other Exhaust manufacturer. We also advise that you either Ceramic Coat them or use heat wrapping tape to ensure that your engine bay temperatures remain as low as possible. If you are going to use Heat Wrapping tape then we advise you cover your manifolds in Duck Oil to protect them as the tape can hold moisture causing your manifolds to corrode very badly. We advise if possible to use Ceramic Coating as this is the most Maintenance free option. If you are going to make your own manifolds then we also advise that you place curved exits and not straight T-Pieces as this causes hot spots to form on the exhaust and the curved exits provide better exhaust gas flow.
  16. Exhausts: When it comes to your exhausts this is the following advice received from experts in this field. For maximum torque you can use 57mm pipes from your exhaust manifolds to your crossover with a balancing tube before the crossover. After that you have the option to go either single or dual exit.
  17.  Throttle Reset: The throttle on the 1UZ-FE VVT-I and the 3UZ-FE VVT-I are fully drive by wire. They are made up of 3 components. 1 – Accelerator Position Sensor (APS) 2 – You Throttle Position Sensor (TPS) 3 – Throttle Motor. In the event that your throttle is either unresponsive or you feel that it is not as responsive as it was before this may be due to your TPS and your APS readings are out of sync. You can correct this by performing a Throttle Reset. Please follow the procedure below step by step.
    1. Switch on your Ignition
    2. Depress the accelerator until it is fully open
    3. Hold the accelerator open for 30 seconds
    4. Release the accelerator fully
    5. Turn off your Ignition

    This procedure should cure the problem if not please refer to diagnostic codes to see if either the TPS or APS is faulty.


    Lastly we have an extensive amount of Technical How to guides on www.lextreme.co.za you can refer to this website at any time for any extra help that is required.


    If there are any other queries or technical related questions then you can either call us on the numbers provided or you can email us on support@lextreme.co.za.


Here is a Guide on how to use the on-board diagnostics built into the Fusebox supplied with the Lextreme system.

Toyota Diagnostics Terminals

1JZ Diagnostics Terminals


NOTE: Not all trouble codes will activate fuse box diagnostics LED check light (CHECK ENGINE light)

  • Before proceeding, make sure the:
    • CHECK ENGINE light circuit is functional. It should be ON when the ignition switch is ON with the engine stopped.
    • Battery voltage is above 11 volts.
    • Throttle valve is fully closed (Throttle Position Sensor IDL points closed).
    • Accessory switches (A/C, etc.) are OFF.
    • Engine is at normal operating temperature (if possible).
  • Turn ignition switch to ON position.
    • Do not start the engine.
    • Place a jumper wire across the two open terminals as shown in the image above.
  • Count number of flashes from CHECK ENGINE light.
    • If system is operating normally with no faults detected, the LED light will blink continuously and evenly about 2 times a second.
  • Otherwise, the LED will blink a number of times equal to the trouble code as follows:
    • The LED blinks only .5 second ON, .5 second OFF when indicating a number.
    • The light will be OFF for 1.5 seconds between the first digit and the second digit of the code.
    • If more than one code is stored, the light will be OFF for 2.5 seconds before the next code is displayed.
    • Once all code(s) have been displayed, the light will be OFF for 4.5 seconds and then the whole sequence will repeat.
  • The diagnostic code series will continue to repeat as long as the bridge in connected in the fuse box.
  • When finished, remove the jumper wire.
  • After repairing the malfunction, clear the codes from the ECUs memory.

    Clearing Trouble Codes

    All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.

    Remove the Battery Positive for 30 seconds with the ignition switch OFF to clear any codes. It may take longer than 30 seconds, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out).After the codes are cleared, road test the vehicle (as applicable for the fault) and recheck if any codes reset. If so, it indicates that the trouble area has not been repaired correctly.

Toyota Generic Trouble Codes


Fuse Box Diagnostics Codes
1 Normal Condition.
2 Air Flow Meter signal.
3 Ignition signal.
4 Engine Coolant Temperature Sensor signal.
5 Oxygen Sensor.
6 RPM signal (Crank Angle Pulse).
7 Throttle Position Sensor signal.
8 Intake Air Temperature Sensor signal.
9 Vehicle Speed Sensor signal.
10 Starter signal.
11 Switch signal.
12 Knock Control Sensor signal.
12 RPM signal.
13 Knock Control CPU (ECM).
13 RPM signal.
14 Turbocharger Pressure.
14 Ignition signal.
21 Oxygen Sensor.
22 Engine Coolant Temperature Sensor signal.
23 Intake Air Temperature Sensor signal.
24 Intake Air Temperature Sensor signal.
25 Air-Fuel Ratio Lean.
26 Air-Fuel Ratio Rich.
27 Sub Oxygen Sensor signal.
28 No. 2 Oxygen Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
32 Air Flow Meter signal.
34 Turbocharger Pressure signal.
35 Turbocharger Pressure Sensor signal.
35 HAC Sensor signal.
41 Throttle Position Sensor signal.
42 Vehicle Speed Sensor signal.
43 Starter signal.
51 Switch signal.
52 Knock Sensor signal.
53 Knock Sensor signal.
54 Inter-cooler ECM signal.
71 EGR System.
72 Fuel Cut Solenoid signal.
78 Fuel Pump Control signal.
81 TCM Communication.
83 TCM Communication.
84 TCM Communication.
85 TCM Communication.


P0100 Mass Air Flow Circuit.
P0101 Mass Air Flow Circuit Range/Performance.
P0105 Manifold Absolute Pressure Circuit.
P0106 MAP/BARO Circuit Range/Performance.
P0110 Intake Air Temperature Circuit.
P0115 Engine Coolant Temperature Circuit.
P0116 Engine Coolant Temperature Range/Performance.
P0120 Throttle Pedal Sensor Switch “A” Circuit.
P0121 Throttle Pedal Sensor Switch “A” Circuit Range/Performance.
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control.
P0130 Heated Oxygen Sensor Circuit – Bank 1 Sensor 1.
P0133 Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1.
P0135 Heated Oxygen Sensor Circuit – Bank 1 Sensor 1.
P0136 Heated Oxygen Sensor Circuit – Bank 1 Sensor 2.
P0141 Heated Oxygen Sensor Circuit – Bank 1 Sensor 2.
P0150 Heated Oxygen Sensor Circuit – Bank 2 Sensor 1.
P0153 Heated Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1.
P0155 Heated Oxygen Sensor Circuit – Bank 2 Sensor 1.
P0156 Heated Oxygen Sensor Circuit – Bank 2 Sensor 2.
P0161 Heated Oxygen Sensor Circuit – Bank 2 Sensor 2.
P0170 Fuel Trim malfunction.
P0171 System too Lean.
P0172 System too Rich.
P0201 Injector Circuit – Cyl. 1.
P0202 Injector Circuit – Cyl. 2.
P0203 Injector Circuit – Cyl. 3.
P0204 Injector Circuit – Cyl. 4.
P0205 Injector Circuit – Cyl. 5.
P0206 Injector Circuit – Cyl. 6.
P0300 Random Misfire.
P0301 Misfire Detected – Cyl. 1.
P0302 Misfire Detected – Cyl. 2.
P0303 Misfire Detected – Cyl. 3.
P0304 Misfire Detected – Cyl. 4.
P0305 Misfire Detected – Cyl. 5.
P0306 Misfire Detected – Cyl. 6.
P0325 Knock Sensor 1 Circuit.
P0330 Knock Sensor 2 Circuit.
P0335 Crankshaft Position Sensor “A” Circuit.
P0336 Crankshaft Position Sensor “A” Circuit Range/Performance.
P0340 CMP Sensor Circuit malfunction.
P0385 Crankshaft Position Sensor “B” NE2 Circuit.
P0401 EGR Flow Insufficient.
P0402 EGR Flow Excessive.
P0420 Catalyst System Efficiency below Threshold.
P0430 Catalyst System Efficiency below Threshold Bank 2.
P0440 EVAP Control System.
P0441 EVAP Control System Improper Purge Flow.
P0446 EVAP Control System Vent Control.
P0450 EVAP Control System Pressure Sensor.
P0451 EVAP Control System Pressure Sensor Range/Performance.
P0500 Vehicle Speed Sensor.
P0505 Idle Speed Control System.
P0510 Close Throttle Position Switch.
P1100 BARO Sensor Circuit.
P1120 Accelerator Pedal Position Sensor Circuit.
P1121 Accelerator Pedal Position Sensor Range/Performance Problem.
P1125 Throttle Control Motor Circuit.
P1126 Magnetic Clutch Circuit.
P1127 ETCS Actuator Power Source Circuit.
P1128 Throttle Control Motor Lock.
P1129 Electric Throttle Control System.
P1130 Air-Fuel Sensor Circuit Range/Performance.
P1133 Air-Fuel Sensor Circuit Response.
P1135 Air-Fuel Sensor Heater Circuit Response.
P1150 A/F Sensor Circuit Range/Performance.
P1153 A/F Sensor Circuit Response.
P1155 A/F Sensor Heater Circuit.
P1200 Fuel Pump Relay Circuit.
P1300 Igniter Circuit – No. 1.
P1310 Igniter Circuit – No. 2.
P1335 No Crankshaft Position Sensor Signal – Engine Running.
P1349 VVT System.
P1400 Sub-Throttle Position Sensor.
P1401 Sub-Throttle Position Sensor Range/Performance Problem.
P1405 Turbo Pressure Sensor Circuit.
P1406 Turbo Pressure Sensor Range/Performance Problem.
P1410 EGR Valve Position Sensor Circuit.
P1411 EGR Valve Position Sensor Circuit Range/Performance.
P1500 Starter Signal Circuit.
P1510 Boost Pressure Control Circuit.
P1511 Boost Pressure Low.
P1512 Boost Pressure High.
P1520 Stop Lamp Switch Signal.
P1565 Cruise Control Main Switch Circuit.
P1600 ECM.
P1605 Knock Control CPU.
P1630 Traction Control System.
P1633 ECM.
P1652 Idle Air Control Valve Control Circuit.
P1656 OCV Circuit.
P1658 Wastegate Valve Control Circuit.
P1661 EGR Circuit.
P1662 EGR by-pass Valve Control Circuit.
P1780 Park/Neutral Switch.
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