Ignition Timing: T100

Start engine and warm engine to normal operating temperature. Shut engine off. Connect timing light to spark plug wire on cylinder No. 1. Cylinder No. 1 is front cylinder at timing chain end of engine.
Connect scan tool to data link connector No. 3. See Fig 1-30. Scan tool is used to read engine RPM.
Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1. See Fig 9-37. Data link connector No. 1 is located on end of air intake chamber at the front of the engine. Apply parking brake. Place transmission in Neutral. Start engine.
NOTE: Timing marks are located on timing chain cover, near crankshaft pulley.
Ensure base timing is within specification at idle with transmission in Neutral, and with A/C and all accessories off. See IGNITION TIMING table. Shut engine off. Remove jumper wire, timing light and scan tool.

IGNITION TIMING (Degrees BTDC @ Idle) ⁽¹⁾

Application

⁽²⁾ Base Timing

⁽³⁾ Controlled Timing

Camry & Celica

8-12

0-10

Corolla

8-12

6-15

RAV4

8-12

0-10

Tacoma

3-7

4-17

Tercel

7-17

T100

3-7

⁽⁴⁾*

4Runner

3-7

4-17

⁽¹⁾	Check with engine at normal operating temperature, transmission/transaxle in Neutral, parking brake applied, electric cooling fan off (if equipped) and A/C and all accessories off.

⁽²⁾	With Jumper Wire (SST 09843-18020) installed between terminals TE1 and E1 on data link connector No. 1.

⁽³⁾	With jumper wire removed from data link connector No. 1.

⁽⁴⁾	Information is not available from manufacturer.

Fig 1: Connecting Scan Tool (Camry)