Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTIONON-VEHICLE INSPECTION
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
On-Vehicle Inspection
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION On-Vehicle Inspection
ON-VEHICLE INSPECTION
NOTE: "Cold" and "Hot" in this section mean the temperature of the coils themselves. "Cold" is from -10 degrees C (14 degrees F) to 50 degrees C (122 degrees F) and "Hot" is from 50 degrees C (122 degrees F) to 100 degrees C (212 degrees F).
INSPECT IGNITION COIL WITH IGNITER AND PERFORM SPARK TEST
a. Check for DTCs.
NOTE: If any DTC is present, perform troubleshooting in accordance with the procedures for that DTC.
b. Check that spark occurs.
1. Set the vehicle to inspection mode.
2. Warm up and stop the engine.
3. Remove the intake air surge tank.
NOTE: If the throttle body connector is disconnected because the DTC is detected in inspection, always reconnect it.
4. Disconnect the 6 injector connectors.
5. Remove the ignition coils with igniter.
NOTE: If the ignition coil assembly connector is disconnected because the DTC is detected in inspection, always reconnect it.
6. Using a 16 mm (0.63 in.) plug wrench, remove the spark plugs.
7. Install the spark plugs to each ignition coil with igniter.
8. Ground the spark plugs.
9. Connect the intelligent tester (with CAN VIM) to the DLC3.
NOTE: Check the fully charged battery to indicate HV battery voltage in ECU data monitor.
10. Enter ACTIVE TEST MODE on the intelligent tester.
11. Check if a spark occurs at each spark plug while the engine is being cranked.
NOTE:
- Be sure to ground the spark plug when checking.
- Replace the ignition coil if physical impact is applied to it.
- Do not crank the engine for more than 2 seconds.
c. Spark test flow chart.

1. Check that the wire harness side connector of the ignition coil with igniter is securely connected.

2. Perform spark test on each ignition coil with igniter.
1. Replace the ignition coil with igniter with a normal one.
2. Perform spark test again.

3. Check the power supply to ignition coil with igniter.
1. Turn the ignition switch to the ON position.
2. Check that battery voltage is applied to the ignition coil positive (+) terminal.


4. Check the VVT sensor.
1. Measure the resistance according to the value(s) in the table given.


5. Check the crankshaft position sensor.
1. Measure the resistance according to the value(s) in the table given.

6. Check the IGT signal from the ECM.
d. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 25 N.m (250 kgf.cm, 18 ft.lbf)
e. Install the ignition coil with igniter.
Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)
f. Install the intake air surge tank.
NOTE: After performing all the procedures, be sure to clear DTCs stored in the the memory. Then, check that the normal system code is output.
NOTE: "Cold" and "Hot" in this section mean the temperature of the coils themselves. "Cold" is from -10 degrees C (14 degrees F) to 50 degrees C (122 degrees F) and "Hot" is from 50 degrees C (122 degrees F) to 100 degrees C (212 degrees F).
INSPECT IGNITION COIL WITH IGNITER AND PERFORM SPARK TEST
a. Check for DTCs.
NOTE: If any DTC is present, perform troubleshooting in accordance with the procedures for that DTC.
b. Check that spark occurs.
1. Set the vehicle to inspection mode.
2. Warm up and stop the engine.
3. Remove the intake air surge tank.
NOTE: If the throttle body connector is disconnected because the DTC is detected in inspection, always reconnect it.
4. Disconnect the 6 injector connectors.
5. Remove the ignition coils with igniter.
NOTE: If the ignition coil assembly connector is disconnected because the DTC is detected in inspection, always reconnect it.
6. Using a 16 mm (0.63 in.) plug wrench, remove the spark plugs.
7. Install the spark plugs to each ignition coil with igniter.
8. Ground the spark plugs.
9. Connect the intelligent tester (with CAN VIM) to the DLC3.
NOTE: Check the fully charged battery to indicate HV battery voltage in ECU data monitor.
10. Enter ACTIVE TEST MODE on the intelligent tester.
11. Check if a spark occurs at each spark plug while the engine is being cranked.
NOTE:
- Be sure to ground the spark plug when checking.
- Replace the ignition coil if physical impact is applied to it.
- Do not crank the engine for more than 2 seconds.
c. Spark test flow chart.
1. Check that the wire harness side connector of the ignition coil with igniter is securely connected.
2. Perform spark test on each ignition coil with igniter.
1. Replace the ignition coil with igniter with a normal one.
2. Perform spark test again.
3. Check the power supply to ignition coil with igniter.
1. Turn the ignition switch to the ON position.
2. Check that battery voltage is applied to the ignition coil positive (+) terminal.
4. Check the VVT sensor.
1. Measure the resistance according to the value(s) in the table given.
5. Check the crankshaft position sensor.
1. Measure the resistance according to the value(s) in the table given.
6. Check the IGT signal from the ECM.
d. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 25 N.m (250 kgf.cm, 18 ft.lbf)
e. Install the ignition coil with igniter.
Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)
f. Install the intake air surge tank.
NOTE: After performing all the procedures, be sure to clear DTCs stored in the the memory. Then, check that the normal system code is output.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.