1-secm-03-02.pdf - operation - ddcsn - detroit diesel ... · pdf filethe major components of...

2 OPERATION

Section Page

2.1 DDEC BENEFITS .................................................................................... 2-3

2.2 FEATURES .............................................................................................. 2-4

2.3 DDEC SYSTEM--HOW IT WORKS ......................................................... 2-5

2.4 DDEC RELATED PUBLICATIONS ........................................................... 2-23

(Rev. 2/03) All information subject to change without notice.

2-2 From Bulletin 1-SECM-03 6SE497 0207 Copyright © 2003 DETROIT DIESEL CORPORATION

SINGLE DDEC TROUBLESHOOTING MANUAL

2.1 DDEC BENEFITS

All Detroit Diesel On-Highway engines come standard with Detroit Diesel Electronic Controls(DDEC®). The state of the art Electronic Control Module (ECM) allows precise control of theengine management system that provides:

Excellent engine performanceOptimum fuel economyEmissions to meet current laws without after treatmentEngine diagnosticsSimple programming

All information subject to change without notice. (Rev. 2/03)

6SE497 0207 Copyright © 2003 DETROIT DIESEL CORPORATION From Bulletin 1-SECM-03 2-3

2.2 FEATURES

2.2 FEATURES

The following features are part of the DDEC system:

Engine Protection SystemCruise ControlCruise PowerCruise Control Automatic ResumeProgressive Engine Braking In Cruise ControlFan ControlsEngine Fan BrakingProgressive ShiftingVehicle Speed LimitingVehicle Overspeed DiagnosticsVehicle ID NumberPressure GovernorStarter LockoutRemote Throttle - PTO - ControlHigh Idle ControlsDDEC Ether StartOptimized IdleIdle AdjustmentIdle Timer ShutdownAir Temperature ShutdownAuxiliary Engine ProtectionCustomer PasswordRating SecurityMaximum SecurityLow DDEC Voltage LightLow Coolant LightLow Oil Pressure LightHigh Oil Temperature LightHigh Coolant Temperature LightDe-acceleration Light12-volt or 24-volt ECMCommunications Links SAE J1587, J1922, J1939




2.3 DDEC SYSTEM–HOW IT WORKS

The major components of the DDEC system consist of the electronic control module (ECM),the electronic unit injectors (EUI) and the various system sensors. The purpose of the sensors isto provide information to the ECM regarding various engine performance characteristics. Theinformation sent to the ECM is used to instantaneously regulate engine and vehicle performance.

2.3.1 Electronic Unit Injector

An electronic unit injector incorporates a solenoid operated poppet valve which performs theinjection timing and metering functions. When the solenoid valve is closed, pressurization andfuel injection is initiated. Opening the solenoid valve releases injection pressure, ending injection.The duration of valve closure determines the quantity of fuel injected. See Figure 2-1.

Figure 2-1 Electronic Unit Injector

2.3.2 Electrical Connectors

Provide water-tight connections for the harnesses between the sensors and the ECM.



2.3 DDEC SYSTEM--HOW IT WORKS

2.3.3 Air Temperature Sensor

The air temperature sensor is located in the air intake manifold and monitors the air temperatureentering the engine. The ECM adjusts the engine timing to reduce white smoke, improve coldstarts, and provide engine protection. See Figure 2-2. For EGR sensor, see Figure 2-3.

Figure 2-2 Air Temperature Sensor

Figure 2-3 Air Temperature Sensor With EGR




2.3.4 Coolant Temperature Sensor (CTS)

The CTS is located on the right side of the engine. The engine protection feature will be triggeredif the coolant temperature exceeds the specified limits. See Figure 2-4. See Figure 2-5 for sensorwith EGR.

Figure 2-4 Coolant Temperature Sensor

Figure 2-5 Coolant Temperature Sensor With EGR




2.3.5 Fire Truck Pump Pressure Sensor

The fire truck pump pressure sensor is used to monitor water pressure for the Pressure GovernorSystem in the DDEC system. The signal back to the ECM changes r/min which allows the firetruck water pump to maintain a steady water pressure during pumping operation in fire trucks.See Figure 2-6.

Figure 2-6 Fire Truck Pump Pressure Sensor




2.3.6 The Synchronous Reference Sensor (SRS) and Timing ReferenceSensor (TRS)

These sensors control the timing of the engine. The SRS sensor provides a "once per camrevolution" signal and the TRS sensor provides a "36 per crankshaft revolution" signal. Workingtogether, these sensors tell the ECM which cylinder is at top-dead-center for cylinder firing.Precise monitoring of piston position allows for optimum injection timing, resulting in excellentfuel economy and performance with low emissions. See Figure 2-7 for the SRS and the TRS.

Figure 2-7 Timing Reference Sensor and Synchronous Reference Sensor




2.3.7 Oil and Fuel Temperature Sensors

The oil temperature sensor optimizes idle speed and injection timing to improve cold startingability and reduce white smoke. This sensor will activate the engine protection system if the oiltemperature is higher than normal.

The fuel temperature sensor provides a signal to the ECM. The ECM utilizes the fuel temperaturesignal to adjust the fueling for changes in the fuel density as a function of temperature to maintainhorsepower. See Figure 2-8. For sensors with EGR, see Figure 2-9.

Figure 2-8 Oil and Fuel Temperature Sensors

Figure 2-9 Oil and Fuel Temperature Sensors With EGR




2.3.8 Electronic Control Module

The ECM is the brain of the computer system, receiving electronic inputs from the operator aswell as from the engine and vehicle mounted sensors. See Figure 2-10.

Figure 2-10 Electronic Control Module




2.3.9 Coolant Level Sensor (CLS)

The engine protection feature will be triggered if the coolant level sensor detects a low coolantlevel. See Figure 2-11.

Figure 2-11 Coolant Level Sensor




2.3.10 Throttle Position Sensor (TPS)

The electronic foot pedal assembly instantaneously converts the operator’s throttle input into asignal to the ECM. The throttle response is fast and accurate. The TPS is self-calibrated, andrequires no maintenance. See Figure 2-12.

Figure 2-12 Throttle Position Sensor




2.3.11 Vehicle Speed Sensor (VSS)

The VSS provides the ECM with the vehicle road speed for use with cruise control, vehicle speedlimiting, and progressive shifting. See Figure 2-13.

Figure 2-13 Vehicle Speed Sensor




2.3.12 Turbocharger Boost Sensor (TBS)

In monitoring turbocharger compressor discharge, the TBS provides air pressure data to theECM for smoke control during engine acceleration. See Figure 2-14. For sensor with EGR,see Figure 2-15.

Figure 2-14 Turbocharger Boost Sensor

Figure 2-15 Turbocharger Boost Sensor With EGR




2.3.13 Oil Pressure Sensor (OPS)

The OPS will activate the engine protection system when the oil pressure falls below a normal oilpressure at a given engine r/min. See Figure 2-16. For sensor with EGR, see Figure 2-17.

Figure 2-16 Oil Pressure Sensor

Figure 2-17 Oil Pressure Sensor With EGR




2.3.14 Fuel Pressure Sensor (FPS)

The FPS monitors fuel pressure to warn the operator of impending power loss. This feature isoptional. It is not used in international applications. See Figure 2-18.

Figure 2-18 Fuel Pressure Sensor

2.3.15 Turbo Compressor Outlet (TCO) Temperature Sensor

The TCO sensor is located in the outlet of the turbocharger, compressor side, and measurestemperature. If the temperature gets too high, the ECM can derate the power. See Figure 2-19.

Figure 2-19 Turbo Compressor Outlet Temperature Sensor




2.3.16 Turbocharger Speed Sensor

The Turbocharger speed sensor is located in the center section of the turbocharger, and sendsspeed signals to the ECM. See Figure 2-20.

Figure 2-20 Turbocharger Speed Sensor

2.3.17 Air Filter Restriction Sensor (AFRS)

The AFRS is part of the Maintenance Alert System (MAS) and is used to monitor air inletrestriction. See Figure 2-21.

Figure 2-21 Air Filter Restriction Sensor




2.3.18 Exhaust Temperature Sensor

This sensor is OEM/Customer installed in the exhaust and is used to prevent engine/converterdamage. See Figure 2-22.

Figure 2-22 Exhaust Temperature Sensor




2.3.19 Relative Humidity (RHS) / Turbo Compressor Inlet (TCI)Temperature Sensor

The RHS/TCI sensor is located by the OEM in the piping between the air filter and turbo inlet.See Figure 2-23.

Figure 2-23 Relative Humidity / Turbo Compressor Inlet (TCI) TemperatureSensor




2.3.20 Barometric Pressure Sensor

This sensor is located in the engine harness, tie-wrapped on the right side under the manifold.See Figure 2-24.

Figure 2-24 Barometric Pressure Sensor

2.3.21 EGR Delta Pressure Sensor (DPS)

The EGR Delta-P sensor measures the difference in pressure across the venturi in the cold pipe. Itis used with the EGR temperature sensor to determine exhaust gas flow. See Figure 2-25.

Figure 2-25 EGR Delta Pressure Sensor




2.3.22 EGR Temperature Sensor

The EGR temperature sensor is located in the cold side EGR piping and monitors temperature.This sensor and the Delta-P sensor data are used to calculate the exhaust gas flow. See Figure 2-26.

Figure 2-26 EGR Temperature Sensor

2.3.23 Oil Level Sensor (OLS)

The OLS is part of the Maintenance Alert System (MAS) and monitors the oil level.See Figure 2-27.

Figure 2-27 Oil Level Sensor




2.4 DDEC RELATED PUBLICATIONS

The following manuals, listed in Table 2-1, should be used for reference when troubleshootingDDEC components.

Publication Number

DDEC IV Application and Installation manual 7SA743

DDEC III Application and Installation manual 7SA742

Optimized Idle Installation and Troubleshooting 7SA741

Optimized Idle User Manual 6SE518

Optimized Idle Troubleshooting and Reprogramming 18SA366

Engine Synchro Shift (ESS) Troubleshooting Manual 6SE498

Construction and Industrial EDM and AIM Installation and Troubleshooting 7SA801

Construction and Industrial EDM and AIM User Manual 6SE710

DDC Ether Start 7SA727

Series 50G Application and Installation Engineering Guidelines, Bulletin 53 18SA365

DDEC III Automotive Code Chart, 3 color, 8.5 x 11 7SE444

DDEC III Codes, Reference Pamphlet 7SE414

DDEC II Troubleshooting Manual 6SE489

DDEC II Application and Installation manual 7SA707

Series 60 Driving Tips (includes VHS video) 25STV0161

Table 2-1 DDEC Related Publications



2.4 DDEC RELATED PUBLICATIONS



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