DDEC VI Operation
Note: This engine is equipped with DDEC VI software. This software generally assures optimal engine performance. The installation of software upgrades may cause minor changes in features and engine performance.
Since the DDEC VI system is electronic, a battery is required to operate the computer. The system operates at 12 volts. However, in the event of a power supply malfunction, the system will continue to operate at reduced voltage. When this occurs, the AWL (Check Engine) will come on.
The engine will only operate at reduced rpm until the battery voltage reaches a point where the MCM will no longer function and the engine shuts down.
Should the AWL (Check Engine) come on for any reason, the vehicle can still be operated and the driver can proceed to the required destination. This condition should be reported to an authorized Detroit Diesel distributor or dealer.
NOTICE: |
When the RSL (Stop Engine) comes on, the computer has detected a major malfunction in the engine that requires immediate attention. It is the operator’s responsibility to shut down the engine to avoid serious damage. |
The engine can be configured to give a warning only, to ramp down (reduce power) or to shut down. Ramp down will reduce engine rpm to a predetermined speed, but will not shut down the engine. With the 30–second shutdown option, the engine will begin a 30–second, stepped powerdown sequence until it shuts down completely.
The “Stop Engine Override” feature can be activated in the case where the vehicle is operating in a critical location.
Stop Engine Override Switch
This feature allows the operator to override the automatic stop engine sequence.
This is done by pressing the Stop Engine Override Switch every 15 to 20 seconds to prevent engine shutdown from occurring.
Note: The Stop Engine Override Switch and the Diagnostic Request Switch are the same.
Note: Holding down the Stop Engine Override Switch will not prevent the engine shutdown sequence. You must continue to reset the automatic shutdown system by pressing the Stop Engine Override Switch at intervals of approximately 15 to 20 seconds.
It takes 30 seconds from the time the automatic shutdown sequence begins until engine shutdown. Therefore, the operator must
press the override switch just prior to engine shutdown and continue to do so until the vehicle can be brought to a stop in a safe location.
Immediate Speed Reduction
The immediate speed reduction option will bring engine rpm back to a predetermined speed, but will not shut down the engine.
The engine should not be restarted after it has been shut down by the engine protection system, unless the problem has been located and corrected.
Red Stop Lamp
The conditions that will cause the RSL (Stop Engine) to come on are:
- High coolant temperature
- Loss of coolant
- High oil temperature
- Low oil pressure
- Auxiliary shutdown
Whenever the AWL (Check Engine) or the RSL (Stop Engine) come on, the DDEC computer will determine where the problem is and will then store this information in its memory.
If the malfunction is intermittent, the lights will come on and go off as the computer senses the changing engine condition.
Diagnostic Tool
The diagnostic tool for DDEC VI is DDDL 7.0. DDDL 7.0 requirements are listed in Table
“DDDL 7.0 System Requirements”
.
Once the malfunction has been corrected, the DDEC VI system will return the engine to normal operation.
The temperature of air in the intake system is increased with the addition of an EGR. DDEC VI is programmed to reduce fueling (power) for a short time to reduce air and coolant temperatures when necessary.
DDEC VI will store an information code that this event occurred, but no corrective action is required as this action is designed to maintain operation without a noticeable affect on vehicle performance.
Flashing Malfunction Codes
All malfunction codes are four digits. The malfunction code recorded in the computer memory will remain until it is erased by a technician.
The flashing malfunction code can also be obtained by the operator. To support flashing codes, a Stop Engine Override/Diagnostic Request Switch must be configured and the AWL (Check Engine) and RSL (Stop Engine) must be hard-wired. The CPC cannot flash these lamps if they are not hard-wired.
The flashing code feature may be activated by satisfying one of the following conditions:
- Engine speed is <100 rpm and the SEO Switch is put in the ON position.
- Idle Governor is active and the SEO Switch is put in the ON position.
- Vehicle speed is <3 mph and Parking Brake is activated and the SEO Switch is put in the ON position.
The flashing code feature is deactivated once the SEO Switch is returned to the OFF position or the listed conditions are no longer satisfied.
Only one light will be flashing codes at any time. All codes will be flashed twice. The interdigit pause is 1.5 seconds. The pause between codes is 3.5 seconds. The same 3.5–second pause occurs as the switch is made from RSL (Stop Engine) to AWL (Check Engine).
When code flashing is initiated, the active codes will be flashed on the RSL (Stop Engine). Then the inactive codes will be flashed on the AWL (Check Engine). When all the inactive codes have been flashed, the process of flashing all the active codes followed by all the inactive codes will repeat until the conditions for code flashing are no longer satisfied.
If there are no active or inactive faults, the number 3 is flashed once followed by an intercode gap of 3 seconds.
To Read Codes:
Press and hold the SEO/Diagnostic Request Switch. Active codes will be flashed on the RSL (Stop Engine) first, followed by inactive codes being flashed on the AWL (Check Engine).
The codes will continue to flash and repeat as long as the Diagnostic Request Switch is held in the ON position. Both CPC and MCM faults are included.
Active Codes
The active codes will be flashed on the RSL (Stop Engine) in the order of most recent to least recent occurrence based on engine hours.
Inactive Codes
The inactive codes will be flashed on the AWL (Check Engine) in the order of most recent to least recent occurrence based on engine hours.
EPA07 DD15 Operator’s Guide – DDC-SVC-MAN-0003 |
Generated on 10-13-2008 |