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4-Cylinder Ignition Timing: Corolla

  1. Start engine and warm engine to normal operating temperature. Shut engine off.
  2. 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.
  3. Connect scan tool to data link connector No. 3. See Figure. Scan tool is used to read engine RPM.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
    Fig 1: Connecting Timing Light (Corolla)
    G99D52822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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