CELICA & Echo

Start engine and warm engine to normal operating temperature. Shut engine off. Connect timing light lead to cylinder No. 1. Cylinder No. 1 is front cylinder at timing chain end of engine.
Apply parking brake. Place transaxle in Neutral. Note location of data link connector No. 3 at driver's side of instrument panel. See Fig 1 and Fig 2 . Install Jumper Wire (SST 09843-18020) between terminals No. 4 (CG) and 13 (TC) on data link connector No. 3. See Figure.
Start engine. Check ignition timing with engine idling. Timing marks are located on timing chain cover, near crankshaft pulley. Ensure base timing is within specification at idle with transaxle in Neutral, and with A/C and all accessories off. See IGNITION TIMING SPECIFICATIONS table. Shut engine off. Remove jumper wire and timing light.

Fig 1: Locating Data Link Connector No. 3 (Celica)

Fig 2: Locating Data Link Connector No. 3 (ECHO)