Manual Operation Of Service Mode: Override

Override test is represented as a percentage of the tested function's full range during its current operation. This percentage value is displayed in the ECCP temperature display area. The display will alternate between the override percentage value ("--") and the normal operation value. This alternating display is a reminder that the tested function IS NOT being overridden.

Pressing TEMP (Up) and TEMP (Down) buttons simultaneously on ECCP begins override of function. Alternating display will stop, and show override value. Pressing TEMP (Up) button increases value; pressing TEMP (Down) button decreases value. Normal program control is resumed in one of the following 3 ways:

1. Selection of another override will cancel current override.
2. Selection of another system (ECM, BCM, IPC or SIR) will cancel current override.
3. Overriding the value beyond either extreme (0 or 90) will display "--" momentarily before resuming value. Releasing control button while "--" is displayed will resume normal program, and display will start alternating again.

   Override test is unique in that, while in override test, another test (i.e., DATA, INPUTS, or OUTPUTS) can be selected and be active at the same time as override test. After selecting override test, press the OFF button to allow selection of another test type. ECCP will continue to display selected override. By pressing OFF and TEMP (Up) or TEMP (Down) buttons at same time, it is possible to monitor effect of override on different parameter.

   NOTE: To exit diagnostics without clearing codes, depress the BI-LEV button on ECCP.