Ignition Timing: Inspection

WARNING: This page is about a different car, the 2003 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Removing V-Bank Cover Fastener Clip And V-Bank Cover
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
1. Connect the LEXUS hand-held tester or OBDII scan tool to the DLC3.
2. Please refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
Fig 2: Connecting Lexus Hand-Held Tester Or OBDII Scan Tool To The DLC 3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECT TIMING LIGHT TO ENGINE
Connect the tester probe of a timing light to the lead wire as shown.
CHECK IDLE SPEED
1. Race the engine speed at 2,500 RPM for approx. 90 seconds.
2. Check the idle speed.
  - Idle speed: 700 +/- 50 RPM
  Fig 3: Checking Idle Speed
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT IGNITION TIMING
1. Using SST, connect terminals TE1 and E1 of the DLC1. SST 09843-18020
  
  Fig 4: Inspecting Ignition Timing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a timing light, check the ignition timing.
  - Ignition timing: 8-12° BTDC @ idle (Transmission in neutral position)
3. Remove the SST from the DLC1.
  SST 09843-18020
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°.

Fig 5: Identifying Ignition Timing
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DISCONNECT TIMING LIGHT FROM ENGINE
DISCONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL
REINSTALL V-BANK COVER