Engine Data Display Procedure

When the ECC control head is switched into Engine Data Display Mode, various checks can be performed on the HT4100 engine.  The information gained, along with stored error codes, can greatly assist in keeping your Cadillac motor in fine form.

To enter Engine Data Display Mode, proceed as follows:

1.  Turn the ignition ON. Tests can be performed with the motor off or running.   Some data will be zero if the motor is off, eg RPM or if the car is not moving, eg Vehicle Speed.
2.  Depress the OFF & WARMER buttons on the ECC panel simultaneously and hold until '..' appears.   '-1.8.8' will then be displayed which indicates the beginning of the diagnostic readout.
3.  Trouble codes may then be displayed on the ECC control head beginning with the lowest numbered code.   Note that the Fuel Data panel goes blank when the system is displaying in the diagnostic mode.   After the Trouble Codes have been displayed, if any, the display will then show '.7.0'.   This is a decision point.
4.  Depress and release the RESET button on the Fuel Data panel.   The engine data series begins as the display switches from code .7.0 to .9.0.
5.  To advance the display, depress the INSTANT/AVERAGE button located on the Fuel Data Panel.   To return to a previously displayed parameter, depress the RESET button on the Fuel Data Panel.   It is possible to leave the Engine Data Series at any time and return to code .7.0 by depressing the OFF and HI buttons on the ECC control panel.  After the last parameter is displayed, the system advances to code 9.5 and waits for the next command.