Ignition Advance Service

Though the Diagnostic Tester shows the computed ignition, advance, using a timing light confirms that advance took place and the timing marks are in the correct position.

With Distributor Ignition Systems, the point at which ignition occurs may vary because the base reference point can be moved. It is critical that the base reference point be set to factory specifications.

With DLI and DIS, the base reference point is determined by the Crankshaft Position Sensor and rotor, which is non-adjustable.

The angle to which the ignition timing is set during ignition timing adjustment is called the "standard ignition timing." It consists of the initial ignition timing, plus a fixed ignition advance angle (a value that is stored in the ECM and output during timing adjustment regardless of the corrections, etc., that are used during normal vehicle operation).

TDCL

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Ignition timing adjustment is initiated by connecting terminal T1 (or TE 1) of the check connector or TDCL with terminal E1, with the idle contacts on. This will cause the standard ignition timing signal to be output from the back-up IC in the same way as during after-start ignition control.

The standard ignition timing angle differs depending on the engine model. When tuning up the engine, refer to the repair manual for the relevant engine.

NOTE: Even if terminal T1 or TE1 and terminal E1 are connected, the ignition timing will not be fixed at the standard ignition timing unless the idle contacts are on.

Where the G and NE signal generators are in a fixed position (distributorless or direct ignition systems), ignition timing cannot be adjusted.

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