Ignition Timing: Testing and Inspection
IGNITION TIMING INSPECTION1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. CONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
- Remove the fuse cover on the instrument panel.
- Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
- Please refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
3. CONNECT TIMING LIGHT TO ENGINE
- Using a 5 mm hexagon wrench, remove the 2 cap nuts and V-bank cover.
- Connect the timing light pickup clip to the the GREEN lead wire for the No.4 ignition coil.
HINT: You must use a timing light that can detect the primary signal.
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 a jumper wire or SST, connect terminals TE1 and E1 of the DLC1. (SST 09843-18020)
- Using a timing light, check the ignition timing.
8° - 12° BTDC @ idle
(Transmission in neutral position)
- Remove the SST from the DLC1.
6. FURTHER CHECK IGNITION TIMING
- Recheck controlled 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 ENG1NE
- Remove the timing light.
- Using a 5 mm hexagon wrench, install the V-bank cover with the 2 cap nuts.
8. DISCONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL