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 MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTION
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Ignition System: Testing and Inspection
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Testing and Inspection
NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F).
INSPECT IGNITION COIL WITH IGNITER AND SPARK TEST
Check that the spark occurs.
1. Remove the ignition coil with igniters.
2. Using a 16 mm plug wrench, remove the spark plugs.
3. Install the spark plugs to each ignition coil with igniter, and connect the ignition coil with igniter connector.
4. Disconnect the injector connector.
5. Ground the spark plug.
6. Check if spark occurs while engine is being cranked.
NOTE: To prevent gasoline from being injected from injecting this test, crank the engine for no more than 5 - 10 seconds at time. If the spark done not occur, do the test as follows:
7. Using a 16 mm plug wrench install the spark plugs.
Torque: 17.5 Nm (180 kg.cm, 13 ft.lb)
8. Reinstall the ignition coil with igniters.
INSPECT IGNITION COIL WITH IGNITER AND SPARK TEST
Check that the spark occurs.
1. Remove the ignition coil with igniters.
2. Using a 16 mm plug wrench, remove the spark plugs.
3. Install the spark plugs to each ignition coil with igniter, and connect the ignition coil with igniter connector.
4. Disconnect the injector connector.
5. Ground the spark plug.
6. Check if spark occurs while engine is being cranked.
NOTE: To prevent gasoline from being injected from injecting this test, crank the engine for no more than 5 - 10 seconds at time. If the spark done not occur, do the test as follows:
7. Using a 16 mm plug wrench install the spark plugs.
Torque: 17.5 Nm (180 kg.cm, 13 ft.lb)
8. Reinstall the ignition coil with igniters.
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:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.