Usage:
ECM's with Serial No. ending in "CG" and "CJ" have a date and time clock available. This clock indicates month, day, year, and time (including AM/PM). This clock is used to time stamp the following Diagnostic Event Codes:
- * 84-00 Vehicle Overspeed Warning
- * 84-14 Quick Stop Occurrence
- * 100-11 Very Low Oil Pressure
- * 110-11 Very High Coolant Temperature
- * 111-11 Very Low Coolant Level
- * 190-00 Engine Overspeed Warning
- * 84-14 Quick Stop Occurrence
ECM diagnostic snapshots, snapshots triggered using the Set/Resume switch, and Quick Stop snapshots are also time stamped.
Before Adjusting the ECM Date/Time Clock
Before adjusting the ECM Date/Time Clock on a truck ask the owner/operator if they want the time stamped information recorded. After it is recorded, clear this information before adjusting the ECM Date/Time Clock. This is very important if the clock adjustment is a big change. This will prevent unnecessary confusion if someone else views the information at a later date.
Determining When Time Stamped Information Occurred
When viewing time stamped information remember the truck may be based in a different time zone, or someone may have incorrectly or never set the clock. Use the time currently set in the ECM to compare any ECM recorded information to the time the ECM indicates to determine how long ago the time stamped event occurred. DO NOT REPLACE AN ECM BECAUSE OF AN INCORRECT TIME. The following example indicates how to use the clock.
Example use of ECM Date/Time Stamped Information
The Electronic Service Tool indicates a 190-00 Engine Overspeed Warning occurred on JAN 17 1996 10:30:46. The Service Tool also indicates the current ECM time is JAN 24 1996 11:20:58. This indicates the problem occurred approximately one week, 50 minutes ago. Do not compare it to the current time at your location because the truck may be based in a different time zone, or someone may have incorrectly or never set the clock. If the ECM time is significantly different than your current time, for example the wrong month is programmed, make sure you have recorded the time stamped information if it is important. After recording the information, clear the code or snapshot, and then adjust the clock.