Ignition Timing: Testing and Inspection

1. WARM UP ENGINE
- Allow the engine to warm up to normal operating temperature.
2. CONNECT LEXUS HAND-HELD TESTER OR OBD II SCAN TOOL
- Remove the fuse cover on the instrument panel.
- Connect the LEXUS hand-held tester or OBD II scan tool to the DLC3.

Please refer to the LEXUS hand-held tester or OBD II scan tool operator's manual for further details.

3. CONNECT TIMING LIGHT TO ENGINE
- Connect the tester probe of a timing light to the No.1 high-tension cord for No.4 cylinder.





4. CHECK IDLE SPEED
- Race the engine speed at 2,500 rpm for approx. 90 seconds.
- Check the idle speed.

Idle speed: 700 ± 50 rpm

5. INSPECT IGNITION TIMING
- Using SST. connect terminals TE1 and E1 of the DLC1.
SST 09843-18020





- Using a timing light, check the ignition timing.

Ignition timing: 8 - 12°BTDC @ idle
(Transmission in neutral position)

- Remove the SST from the DLC1.
SST 09843-18020
6. FURTHER CHECK IGNITION TIMING

Ignition timing: 7 - 24° BTDC @ idle
(Transmission in neutral position)

HINT: The timing mark moves in a range between 7° and 24°.

7. DISCONNECT TIMING LIGHT FROM ENGINE
8. DISCONNECT LEXUS HAND-HELD TESTER OR OBD II SCAN TOOL