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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. Install Jumper Wire (SST 09843-18040) between terminals TC 13 and CG 4 on data link connector No. 1. See Figure. Data link connector No. 1 is located at driver's side of instrument panel. See Fig 2.
  4. Apply parking brake. Place transaxle in Neutral. Start engine. Engine speed should increase to 1000-1300 RPM for 5 seconds and return to idle.
  5. 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.
  6. 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.
Fig 1: Connecting Timing Light (Corolla)
G99D52822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Locating Data Link Connector No. 3 (Corolla)
G97I28868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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