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Ignition Timing

  1. Start and warm engine to normal operating temperature. Shut engine off. Connect timing light to spark plug wire on cylinder No. 1 (front cylinder at timing belt end of engine). Connect scan tester to data link connector No. 3. See Fig 1. Scan tester is used to read engine RPM.
  2. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1. See Fig 2.
  3. Apply parking brake. Place transaxle in 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.
  4. Ensure base timing is within specification at idle with transaxle in Neutral, and with A/C and all accessories off. See IGNITION TIMING  table.
  5. On 1.6L (4A-FE), if base timing is not within specification, loosen distributor hold-down bolts. Rotate distributor to obtain correct base timing. Tighten distributor hold-down bolts.
  6. On all models, remove jumper wire from data link connector No. 1. On 1.6L (4A-FE), ensure ECM controlled timing is within specification. See IGNITION TIMING  table. On all models, shut engine off. Remove jumper wire, timing light and scan tester.
IGNITION TIMING (Degrees BTDC @ Idle) (1)

Application Type (2) Base Timing (3) ECM Controlled Timing
1.6L (4A-FE) 10 5-15
1.8L (7A-FE) 8-12 (4)
(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 (SST 09843-18020) installed between terminals TE1 and E1 on data link connector No. 1.
(3) With jumper wire removed from data link connector No. 1.
(4) Information is not available from manufacturer.
Fig 1: Connecting Scan Tester
G96I09523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Installing Jumper Wire Between DLC No. 1 Terminals
G95A30890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002