Ignition Timing: Testing and Inspection

INSPECTION





1. REMOVE V-BANK COVER
a. Using a 5 mm hexagon wrench, remove the 3 cap nuts.
b. Loosen the V-bank cover fastener counterclockwise.
c. Remove the V-bank cover.
2. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.





3. CONNECT LEXUS HANDHELD TESTER OR OBDII SCAN TOOL
a. Connect the LEXUS handheld 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 clip of a timing light to the black-red 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 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
a. Using a 5 mm hexagon wrench, install the V-bank cover with the 3 cap nuts. b. Press down the V-bank cover fastener.