Ignition Timing

CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to ignition system. To avoid possible damage to ignitor and/or coil, DO NOT allow tachometer terminal to become grounded.

Warm engine to normal operating temperature. Shut engine off. Connect timing light to spark plug wire on cylinder No. 1.
Connect scan tester to data link connector No. 3. See Fig 1. Scan tester is used to read engine RPM.
Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1. See Fig 2.
Apply parking brake. Place transaxle Neutral. Start engine and maintain engine at 1000-1500 RPM for 5 seconds and then ensure engine returns to idle.
NOTE: Timing marks are located on front cover.
Ensure base timing is within specification at idle with transmission in Neutral, A/C and all accessories off. See the 4-CYLINDER IGNITION TIMING table.
Remove jumper wire from data link connector No. 1. Ensure advance timing is within specification. See 4-CYLINDER IGNITION TIMING table. Remove timing light and scan tester.

4-CYLINDER IGNITION TIMING (Degrees BTDC @ Idle)

Application ⁽¹⁾

⁽²⁾ Base Timing

⁽³⁾ Advance Timing

Tercel

7-17

⁽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 installed between terminals TE1 and E1 on data link connector No. 1.

⁽³⁾	With jumper wire removed from DLC No. 1.

Fig 1: Connecting Tachometer Or Scan Tester

Fig 2: Installing Jumper Wire Between DLC No. 1 Terminals