Ignition Timing

All engines equipped with TCCS utilize a test terminal (T or TE1) somewhere under the hood. Early TCCS utilizes a two-terminal check connector in the wiring harness. This yellow body connector contains circuits T and E1, which when jumpered, default the TCCS system to initial timing. The location of this test terminal varies between applications. Refer to the appropriate repair manual for connector location.

A new design multipurpose check connector began phase-in starting with 1985 models. By 1986 model year, all vehicles are equipped with this new style connector. Connectors are typically located in the fender area on either side, or near the bulkhead, in plain view. With the advent of test terminals for the ECT, TEMS, SRS, and etc., the TCCS test terminal has been renamed TE1 to distinguish it from the others.

early design check connector

To check timing on any TCCS equipped engine:

1) Engine at normal operating temperature.

2) Jumper T (TE1) to El using SST 09843-18020 (or equivalent).

3) Wait for engine rpm to stabilize (speed may rise to I K to 1.3 K rpm for 5 seconds).

4) Use timing light to confirm initial timing as per repair manual procedure.

• Make sure rpm is within specified range.

• Adjust timing as necessary by rotating the distributor (cam position sensor on 7M-GTE).

5) Remove SST jumper.

6) Recheck timing; it should be advanced (at least 3' to 18') from initial with SST removed.

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  • j
    How does ingition timing advance in a toyota sienna?
    7 months ago

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