Ignition Timing: Testing and Inspection

INSPECT IGNITION TIMING
a. Set the vehicle to inspection mode.
b. Warm up the engine.
c. When using the intelligent tester:
(1) Connect the intelligent tester (with CAN VIM) to the DLC3.
(2) Enter DATA LIST MODE on the intelligent tester.
Ignition timing: 8 to 12° BTDC

NOTICE:
^ Turn all the electrical systems off.
^ Inspect the engine idle speed with the cooling fan off.

HINT: Refer to the intelligent tester operator's manual if you need help to select DATA LIST.

(3) Check that the ignition timing advances immediately when the engine speed is increased.





d. When not using the intelligent tester:
(1) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
SST 09843-18040

NOTICE:
^ Make sure of the terminal numbers before connecting them. Connection with a wrong terminal can damage the engine.
^ Turn off all electrical systems before connecting the terminals.
^ Perform this inspection after the cooling fan motor is turned off.





(2) Pull out the red-colored wire harness as shown in the illustration.
(3) Connect the tester terminal of the timing light to the engine.

NOTICE: Use a timing light which detects the first signal.

(4) Inspect ignition timing at idle.
Ignition timing: 8 to 12° BTDC

NOTICE: When checking the ignition timing, the transmission is in neutral.

HINT: Run the engine at 1,000 to 1,300 rpm for 5 seconds, check that the engine rpm returns to idle speed.

(5) Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
(6) Inspect ignition timing at idle.
Ignition timing: 7 to 24° BTDC
(7) Confirm that the ignition timing advances when the engine rpm is increased.
(8) Remove the timing light.