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Detroit Diesel Electronic Engine Commander (EEC) for Engine Speed Cruise Control

Engine Speed Cruise Control

Figure 1.1 - Detroit Diesel EEC

(A). Requirements for Engine Speed Cruise Control
The hardware listed below is needed for Engine Speed Cruise Control installation with EEC.
Electronic Engine Commander 1 (Armored Cable Version) – P/N 23531392.
Electronic Engine Commander 2 (Liquid-Tite Conduit Version) – P/N 23532945.
OEM Interlocks - OEM Supplied.
The OEM may supply a series of interlocks to ensure the Equipment is in the appropriate state to operate in RPM Mode. Activation of the appropriate interlocks for RPM Mode will result in +12/24 volts on wire TWOOEM Interlock and illumination of the THROTTLE READY lamp.

(B). EEC Wiring for Engine Speed Cruise Control
Figure 1.2 - DDEC III/IV EEC Harness 
The following wiring, listed below is required for EEC.
#EEC Wire  Function  DDEC III/IV Connector/ Wire Number  Description
  • ONE ↔ Optional Digital Input Mode (EEC Output) ↔ H1/ 523 ↔ Low State (On) = Pressure Mode/ High State (Off) = RPM Mode
  • TWO ↔ OEM Interlock (EEC Input) ↔ 7 < V < 32 VDC = OEM Interlock Closed/ V < 4 VDC = OEM Interlock Open
  • THREE ↔ System Ground (-) ↔ 953 ↔ DDEC Battery Ground
  • FOUR ↔ Not Used
  • FIVE ↔ Cruise Enable (EEC Output) ↔ G2/ 543 ↔ Cruise Enable
  • SIX ↔ Resume/Accel On (EEC Output) ↔ G3/ 545 ↔ Low State (On, Increase)/ High State (Off, No Increase)
  • SEVEN ↔ Set/Coast On (EEC Output) ↔ J1/ 541 ↔ Low State (On, Decrease)/ High State (Off, No Decrease)
  • EIGHT ↔ Cruise Active (EEC Input) ↔ A1/ 988 ↔ Cruise Active
  • NINE ↔ External Alarm (EEC Output) ↔ Low State (Alarm On)/ High State (Alarm Off)
  • TEN ↔ Not Used
  • ELEVEN ↔ System Power (+) ↔ Power Harness on Hazardous Environment Engine ↔ 439 ↔ DDEC Ignition Power
  • TWELVE ↔ Low Fuel Switch (EEC Input) ↔ Low State (On) = Low Fuel/ High State (Off) = Fuel Level OK
  • WHITE ↔ SAE J1587 Data Link ↔ C-2/ 900 ↔ SAE J1587 Data Link (+)
  • BLACK ↔ SAE J1587 Data Link ↔ C-1/ 901 ↔ SAE J1587 Data Link (-)
*DDC circuit numbers and port assignments shown are typical but can differ from application to application. Read More: Harness for Engine's Display (Caterpillar, Cummins, and Detroit Engines).
→Inputs — High State: 4.0 V < V < Battery (+), Low State: —2.0 V < V < 1.0 V
→Outputs — On (Closed/Low) @V out < 0.8 V, Off (Open/High) @0 < out < Battery (+) V, I max≤ 1.55 A

(C). Engine Speed Cruise Control Software Requirements 
The DDEC software requirements for using Engine Speed Cruise Control with EEC are as follows:
Figure 1.3 - Cruise ^5 (Enable Cruise)
2). Four Digital Inputs (Input functions) must be configured for use with EEC. Read More: ECM I/O Configuration on Detroit Diesel Diagnostic Link (DDDL) Software.
→F2 - Service Brake Released (wire no. 544)
J1 - Set/Coast (wire no. 541)
→G3 - Resume/Accel (wire no. 545)
→G2 - Cruise Control Enable (wire no. 543)
3). One Digital Output (Output function) must be configured for use with EEC.
→A1 - Cruise Active (wire no. 988)
Figure 1.4 - ECM I/O Configuration

(D). Engine Speed Cruise Control Mode
Use the following procedure to operate in RPM Mode:
1). Start the Engine and check that EEC is ON (refer to Figure 1.1 above).
2). Check that the THROTTLE READY and RPM lights are illuminated indicating the system is in RPM Mode. Engine speed may be adjusted using the following buttons as listed below. Read More: Operating the Detroit Diesel Electronic Engine Commander (EEC).
PRESET - Press the button to command the Engine to go to the Preset speed.
INC - Press the button to increase Engine speed in 25 RPM increments each time the button is pressed. Press and hold the button to increase the speed at a faster rate equivalent to two (2) increments per second.
DEC - Press the button to decrease Engine speed in 25 RPM increments. Press and hold the button to decrease the speed at a faster rate equivalent to two (2) increments per second.
IDLE - Press the button to return the Engine immediately to the normal Idle speed.

(E). Input/ Output Functions on DDDL
Connect to DDDL Software, and select Diagnostic Instrumentation menu. Read More: Diagnostic Instrumentation using Detroit Diesel Diagnostic Link (DDDL).
Select to List ^5 - Input/Output display.
→Monitoring din-J1 SET/COAST ON (Press INC button), the value will change from Open to Gnd.
Figure 1.5 - din-J1 SET/COAST ON (value: Gnd)
→Monitoring din-G3 RES/ACCEL ON (Press DEC button), the value will change from Open to Gnd.
Figure 1.6 - din-G3 RES/ACCEL ON (value: Gnd)

*Note: The DDEC Service Brake Released Digital Input (F2) must be grounded during the operation of Engine Speed Cruise Control. A Cruise Disable Switch must be wired on the DDEC Service Brake Released Digital Input to provide a redundant method of disabling Engine Speed Cruise Control.








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