Section 2.15
DDEC V Electronic Control Unit

DDEC V provides an indication of engine and vehicle malfunctions. The ECU continually monitors the DDEC V system. See Figure "DDEC V System Series 60 Diesel Engine" .‪

Figure 1. DDEC V System Series 60 Diesel Engine

Any faults that occur are stored as codes in the ECU's memory. These codes can be accessed in any of three ways: ‪

1. A DDDL® can be used to read the codes.
2. A personal computer (PC) connected to the ECM through a translator device which converts J1708 to RS232 protocol can be used.
3. The Amber Warning Lamp (AWL) or the Red Stop Lamp (RSL) is illuminated.
   • The AWL (panel mounted yellow indicator light) illuminated diagnose condition as soon as convenient.
   • The RSL (panel mounted red indicator light) and AWL illuminated, a major fault occurred and immediate attention required to avoid engine damage.
   • Automatic engine shutdown or rampdown is available as an option. A shutdown override switch is required to allow the vehicle to be moved to a safe location during automatic shutdown or rampdown.

The Detroit Diesel Diagnostic Link® (DDDL) is a sophisticated PC software package that requests and receives engine data and diagnostic codes. The Detroit Diesel Diagnostic Link® DDDL supports DDEC V and the Series 60 2004 engine.‪

The DDDL functions are:‪

• Read and display current calibration for an ECU.
• Create a calibration for the ECU on an individual engine.
• Save a single calibration with an ECU password, this same password can be used for fleet of vehicles with the same password or technician who does not have access to the password.
• Change the engine rating of a vehicle.
• Set the injector calibration when you replace the injectors.
• View an audit trail of ECU and injector calibration changes.

The SAE Standard Communications of the DDEC V system are listed in Table "SAE Standard Communications for DDEC V" . The fan control inputs and outputs for DDEC V are listed in Table "Fan Controls for DDEC V" . The engine brake control features of DDEC V are listed in Table "Engine Brake Controls with DDEC V" . DDEC V can identify faulty components and other engine-related problems by providing the technician with a diagnostic code. Standard sensors are listed in Table "Standard Sensors for DDEC V" . OEM installed sensors are listed in Table "OEM Installed Sensors" .‪

Section 2.15.1
Repair or Replacement of the DDEC V Electronic Control Unit

The DDEC V ECU is a sealed, nonserviceable unit. Tag defective ECU for recore.‪

Section 2.15.2
Removal of the DDEC V Electronic Control Unit

Perform the following steps for ECU removal:‪

1. Disconnect the vehicle battery power to prevent failure of the ECU.
2. Remove screw from center of shroud and connector. Remove two nuts from threaded studs at the base of the shroud and ECU see Figure "DDEC V Electronic Control Unit and Related Parts" .
3. Remove shroud and connector from ECU.
4. Remove the two through-bolts, two nuts and two studs holding the ECU to the engine, remove the ECU from engine. See Figure "DDEC V Electronic Control Unit and Related Parts" .

Section 2.15.3
Installation of the DDEC V Electronic Control Unit

Perform the following steps for ECU installation:‪

1. Inspect the ECU isolators for damage and replace if required.
2. Mount the ECU to the engine.
3. Secure the ECU to the engine with two through-bolts, two studs and nuts. Torque the ECU-to-engine bolts to 23-27 N·m (17-20 lb·ft).
4. Install the engine harness connector and shroud to the ECU. Torque center screw and two nuts to 5.6 N·m (50 in.· lb).
5. Reconnect vehicle battery power.
6. Turn the ignition to the "ON" position. Observe the DDDL for any diagnostic code(s). If any code(s) other than code 25 is logged, refer to the DDEC V Troubleshooting Guide, 6SE570.
   

   1. Nut‪	5. Electronic Control Unit‪
   2. Stud‪	6. Bolt‪
   3. Isolater‪	7. Bolt‪
   4. Isolater‪	8. Shroud‪

   Figure 2. DDEC V Electronic Control Unit and Related Parts

   PERSONAL INJURY ‪
   Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.‪ Always start and operate an engine in a well ventilated area. If operating an engine in an enclosed area, vent the exhaust to the outside. Do not modify or tamper with the exhaust system or emission control system.

7. Start the engine, and check for leaks.