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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGTESTING AND INSPECTION
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Ignition Timing: Testing and Inspection
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Testing and Inspection
INSPECTION
1. REMOVE V-BANK COVER
a. Using a 5 mm hexagon wrench, remove the 3 nuts.
b. Remove the V-bank cover fastener clip and V-bank cover.
2. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
3. CONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
a. Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
b. Please refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
4. CONNECT TIMING LIGHT TO ENGINE
Connect the tester probe of a timing light to the lead wire as shown.
5. CHECK IDLE SPEED
a. Race the engine speed at 2,500 rpm for approx. 90 seconds.
b. Check the idle speed.
Idle speed: 700 ± 50 rpm
6. INSPECT IGNITION TIMING
a. Using Special Service Tool (SST), connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
b. Using a timing light, check the ignition timing.
Ignition timing: 8 - 12° BTDC @ idle (Transmission in neutral position)
c. Remove the SST from the DLC1.
SST 09843-18020
7. FURTHER CHECK IGNITION TIMING
Ignition timing: 10 - 25° BTDC @ idle (Transmission in neutral position)
HINT: The timing mark moves in a range between 10° and 25°.
8. DISCONNECT TIMING LIGHT FROM ENGINE
9. DISCONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
10. REINSTALL V-BANK COVER
1. REMOVE V-BANK COVER
a. Using a 5 mm hexagon wrench, remove the 3 nuts.
b. Remove the V-bank cover fastener clip and V-bank cover.
2. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
3. CONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
a. Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
b. Please refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
4. CONNECT TIMING LIGHT TO ENGINE
Connect the tester probe of a timing light to the lead wire as shown.
5. CHECK IDLE SPEED
a. Race the engine speed at 2,500 rpm for approx. 90 seconds.
b. Check the idle speed.
Idle speed: 700 ± 50 rpm
6. INSPECT IGNITION TIMING
a. Using Special Service Tool (SST), connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
b. Using a timing light, check the ignition timing.
Ignition timing: 8 - 12° BTDC @ idle (Transmission in neutral position)
c. Remove the SST from the DLC1.
SST 09843-18020
7. FURTHER CHECK IGNITION TIMING
Ignition timing: 10 - 25° BTDC @ idle (Transmission in neutral position)
HINT: The timing mark moves in a range between 10° and 25°.
8. DISCONNECT TIMING LIGHT FROM ENGINE
9. DISCONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
10. REINSTALL V-BANK COVER
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.