Chart 17-Shift Indicator Light & Audible Chimes On

NOTE: Verify that the customer has read the Owner Guide on the Thunderbird SC overheat protection feature.

The Thunderbird SC is equipped with a Shift Indicator Light and Audible Chime that warns the customer when the engine oil or coolant overheats while the vehicle is operated at high speeds (above 100 MPH) for extended periods of time.

The Shift Indicator Light and Chime will also warn the customer when the engine has reached too high an RPM for that gear. The EEC-IV processor will reduce vehicle speed by limiting fuel to the engine when one of these overheat conditions has been reached. The customer may then notice a loss of power and/or a slight vibration. the Shift Indicator Light will "light" and the Audible Chime will produce a "steady tone" to alert the customer to upshift at the time.

Full power will be restored and the Shift Indicator Light and Chimes will turn off when the vehicle returns to normal operating temperatures.

DIAGNOSTIC CHART 17-SHIFT INDICATOR LIGHT & AUDIBLE CHIMES ON

System & Component(s)	Reference
EEC EEC-IV Quick Test SIL Circuit Top Gear Switch	See TESTS W/CODES article.
THUNDERBIRD SC Audible Chime System	See CIRCUIT TEST KL in TESTS W/CODES article.