Ignition Timing: Es300

NOTE: To perform this procedure, you need a timing light that will flash when it detects a signal from the primary side of the ignition coil (ignition is distributorless).

Ensure engine is at normal operating temperature. Connect tachometer test lead to terminal IG- of DLC No. 1, located on right front strut tower. See Fig 1. Remove "V" bank cover from above left cylinder bank.
Connect pick-up clip of timing light to Green wire terminal of ignition coil No. 4. Run engine at about 2500 RPM for about 90 seconds. Ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS table under IDLE SPEED & MIXTURE.
Connect jumper wire between terminals TE1 and E1 of DLC No. 1. Check base timing. See IGNITION TIMING table. If base timing is within specification, go to next step. If base timing is not within specification, check for one or more of the following conditions, repair as necessary, then go to next step:
- Throttle valve is being prevented from fully closing.
- Throttle position sensor is misadjusted (indicated by no continuity between terminals IDL1 and E2 of throttle position sensor connector). See THROTTLE POSITION (TP) SENSOR .
- Valve timing is incorrect (timing belt is incorrectly installed).
Disconnect jumper wire from DLC No. 1. Check controlled timing. Ensure controlled timing is within specification. See IGNITION TIMING table. If controlled timing is not within specification, problem exists in engine control system.

IGNITION TIMING (Degrees BTDC @ RPM)

Application

⁽¹⁾ Base Timing

⁽²⁾ Controlled Timing

ES300

10 @ 650-750

7-17 @ 650-750

⁽¹⁾	Jumper wire connected between terminals TE1 and E1 of DLC No. 1. See Fig 1.

⁽²⁾	Jumper wire disconnected from DLC.

Fig 1: Identifying Terminals Of Data Link Connector (DLC) No. 1