4-Cylinder Ignition Timing: Corolla
- Start engine and warm engine to normal operating temperature. Shut engine off.
- Connect timing light lead to Black/White wire at ignition coil for cylinder No. 1. See Fig 1. Cylinder No. 1 is front cylinder at timing chain end of engine.
- Connect scan tool to data link connector No. 3. See Figure. 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 Figure. Data link connector No. 1 is located at driver's side of engine compartment, near strut tower.
- Apply parking brake. Place transaxle in Neutral. Start engine and maintain engine at 1000-1300 RPM for 5 seconds and then ensure engine returns to idle.
- 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.
- Remove jumper wire from data link connector No. 1. Ensure ECM controlled timing is within specification. See IGNITION TIMING SPECIFICATIONS table. Shut engine off. Remove timing light and scan tool.