Alternator & Regulator: Self-Diagnostics: Override

OVERRIDE tests facilitate display of a component's current operation status, represented as a percentage of its full range. OVERRIDE tests also permit a component's present functional status to be overridden and controlled by technician. To enter OVERRIDE:
- Enter self-diagnostics by pressing OFF and WARMER buttons on the ECC panel.
- After segment check has occurred and all stored trouble codes have been displayed, select PCM system for testing by pressing HI button on ECC panel with PCM displayed as system choice.
- Cycle through test types by pressing LO button on ECC panel. Select OVERRIDE test type by depressing HI button on ECC panel with OVERRIDE displayed as test type choice.
After selecting OVERRIDE, select a specific test by scrolling through available override tests using LO button on ECC panel.
Display now alternates between selected system's present operating specification and normal specification for system. All values for comparison are displayed on ECC panel.
With selected override test displayed, pressing WARMER or COOLER button on ECC panel begins override function while simultaneously stopping alternating display of present and normal system operating values. Pressing WARMER button increases a value. Pressing COOLER button decreases a value.
Upon releasing WARMER or COOLER button, display may remain at an override value or automatically return to normal program control. If display remains at override value, normal program control resumes by:
- Selecting another OVERRIDE test using LO button on the ECC panel, canceling current override.
- Selecting another system by pressing OFF button and then HI or LO button on ECC panel, canceling current override.
- Overriding a value beyond extremes of zero or 99 will display "----" momentarily and then jump to the opposite extreme. If button is released while "----" is displayed, normal program control resumes.

NOTE: While in OVERRIDE, another test type within selected system may also be active. After selecting an OVERRIDE test, press OFF button to select another test type. ECC panel, however, continues to display selected override. Pressing WARMER or COOLER button allows monitoring effect of OVERRIDE on different vehicle parameters.