Ignition Timing: Testing and Inspection

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.
a. Connect the LEXUS hand-held tester or OBD II scan tool to the DLC3.
b. 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.
a. Race the engine speed at 2,500 rpm for approx. 90 seconds.
b. Check the idle speed.

Idle speed: 700 + 50 rpm





5. Inspect ignition timing.
a. Using 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
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.