Detroit Diesel Troubleshooting Diagrams

Archive for the ‘Fuel System’ Category

Fuel Temperature Sensor Series 60G Engine

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On DDEC III/IV engines there is an Air Temperature Sensor (ATS) mounted to the bottom of the inlet elbow. The ATS sends an electrical signal to the ECM indicating the inlet manifold temperature of the air entering the engine. The ECM uses this information to adjust gas flow, control air fuel ratio and in some cases fan control. The ATS provides necessary input to vary hot idle speed and injection timing resulting in improved cold starts and reduced white smoke.

The Series 60 natural gas engine air temperature sensor (ATS) is installed into the air inlet tube. The ATS sends an electrical signal to the ECM indicating air inlet temperature. The ECM uses this information to adjust gas flow and control air fuel ratio. ‪

Fuel Temperature Sensor Series 60G Engine Fuel Temperature Sensor Series 60G Engine

1. Fuel Temperature Sensor ‪ 5. Air Inlet Elbow ‪
2. PSV ‪ 6. Low Pressure Regulator ‪
3. Fuel Mixer ‪ 7. Air Temperature Sensor ‪
4. Throttle ‪ 8. Fuel Pressure Sensor ‪
9. Fuel Inlet Tee-Fitting ‪

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September 28th, 2011 at 4:35 am

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Series 60 Air Temperature Sensor

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On DDEC III/IV engines there is an Air Temperature Sensor (ATS) mounted to the bottom of the intake manifold. The ATS sends an electrical signal to the ECM indicating the inlet manifold temperature of the air entering the engine. The ECM uses this information to adjust gas flow, control air fuel ratio and in some cases fan control. The ATS provides necessary input to vary hot idle speed and injection timing resulting in improved cold starts and reduced white smoke.

1. Intake Manifold ‪ 2. Air Intake Sensor

Series 60 Air Temperature Sensor Series 60 Air Temperature Sensor

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September 28th, 2011 at 4:33 am

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Series 60 Engine Oil Temperature Sensor

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The Oil Temperature Sensor (OTS) is installed into the main engine oil gallery. A typical location is the left rear corner of the cylinder block. The OTS sends an electrical signal to the ECM indicating engine oil temperature. The ECM uses this information to modify engine speed for better cold weather starts and faster warm-ups. Oil temperatures exceeding specification for two seconds or more will begin the stop engine or warning function. ‪

Series 60 Engine Oil Temperature Sensor Series 60 Engine Oil Temperature Sensor

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September 28th, 2011 at 4:31 am

Series 60 Engine Oil Pressure Sensor

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The Oil Pressure Sensor (OPS) is installed into the main engine oil gallery. A typical location is the left rear corner of the cylinder block.

Series 60 Engine Oil Pressure Sensor Series 60 Engine Oil Pressure Sensor

The OPS sends an electrical signal to the ECM telling it what the engine oil pressure is at any given speed. A low oil pressure signal exceeding seven seconds is used by the ECM to begin the stop engine or warning function.

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September 28th, 2011 at 4:26 am

Air Intake Pressure Sensor Series 60G Engine

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The Series 60G Air Intake Pressure (AIP) sensor is threaded into the intake manifold. The Series 60G natural gas engines use a wide range sensor that allows pressure measurement under conditions of either manifold vacuum or boost. ‪

Air Intake Pressure Sensor Series 60G Engine Air Intake Pressure Sensor Series 60G Engine

This device is a pressure sensor that sends an electrical signal to the ECM. The ECM uses this information to compute the amount of air entering the engine. Fuel supply is regulated by the AIP sensor information to control engine air fuel ratio. The AIP sensor information is also used to control ignition timing.

1. Intake Manifold ‪ 5. Bolt ‪
2. Intake Manifold Inlet ‪ 6. Bolt ‪
3. Intake Manifold Gasket ‪ 7. Air Temperature Sensor (Different location on the High Pressure Fuel System) ‪
4. Cylinder Head ‪ 8. Air Intake Pressure Sensor (AIP)

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September 28th, 2011 at 4:24 am

Series 60 Diesel Turbo Boost Sensor

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The Series 60 Diesel Turbo Boost Sensor (TBS) is mounted to the intake manifold with two bolts. A rubber O-ring is used to seal the sensor to the manifold.

This device is a pressure sensor that sends an electrical signal to the ECM. The ECM uses this information to compute the amount of air entering the engine. Fuel supply is regulated by the TBS information to control engine smoke. ‪

1. Intake Manifold ‪ 3. Turbo-Boost Pressure Sensor ‪
2. Turbo-Boost Pressure Sensor Bolt ‪ 4. O-ring

Series 60 Diesel Turbo Boost Sensor Series 60 Diesel Turbo Boost Sensor

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September 28th, 2011 at 4:19 am

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Series 60 Electronic Foot Pedal Assembly

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The Electronic Foot Pedal Assembly (EFPA) connects the accelerator pedal to a Throttle Position Sensor (TPS). The TPS is a device that sends an electrical signal to the ECM. The signal varies in voltage according to the pressure on the pedal. The system is installed in the space normally occupied by the mechanical foot pedal. The EFPA has maximum and minimum stops that are built into the unit during manufacture. ‪

Series 60 Electronic Foot Pedal Assembly Series 60 Electronic Foot Pedal Assembly

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September 28th, 2011 at 4:16 am

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Schematic Diagram of DDEC I

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This system utilizes an engine mounted EDU and a cab mounted ECM, which has a replaceable Programmable Read-Only Memory (PROM). The EDU functions as the high current switching unit for the actuation of the injector solenoids and is fuel-cooled. ‪

The DDEC I ECM is a microprocessor. It is the control center of the DDEC I system.

The DDEC I ECM is packaged in a die-cast aluminum housing with sealed connectors.

The DDEC I system consists of the following: ‪

  • The DDEC I ECM
  • A replaceable PROM
  • Connections to various engine sensors, operational displays, power and fuel injectors

Schematic Diagram of DDEC I Schematic Diagram of DDEC I

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September 28th, 2011 at 4:12 am

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Schematic Diagram of DDEC II

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This system utilizes an engine-mounted ECM only with the EDU components of the DDEC I system contained in the ECM. The replaceable PROM is an EPROM in the DDEC II ECM. The ECM has isolator mounts for both vibration and electrical isolation. Depending upon application, some units have fuel cooling of the ECM. The engine-mounted system simplifies vehicle wiring for greater reliability. ‪

The DDEC II ECM is a microprocessor. It is the control center of the DDEC II system.

The DDEC II ECM is packaged in a die-cast aluminum housing with sealed connectors. It is mounted on the left side of the engine block. ‪

The DDEC II consists of the following: ‪

  • The DDEC II ECM
  • A replaceable EPROM
  • Connections to various engine sensors, operational displays, power and fuel injectors

Schematic Diagram of DDEC II Schematic Diagram of DDEC II

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September 28th, 2011 at 4:10 am

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DDEC III/IV System Series 60 Diesel Engine

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DDEC III/IV provides an indication of engine and vehicle malfunctions. The ECM continually monitors the DDEC III/IV system.

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

  1. A DDR 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 Check Engine Light (CEL) or the Stop Engine Light (SEL) is illuminated.
    • The CEL (panel mounted yellow indicator light) illuminated diagnose condition as soon as convenient.
    • The SEL (panel mounted red indicator light) and CEL 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.

DDEC III/IV features programmable with a Diagnostic Data Reader (DDR) are: ‪

  • Password
  • Droop
  • Active hp braking
  • Cruise control
  • Engine brake
  • Vehicle speed limiting
  • Vehicle speed sensor
  • Variable Speed Governor cruise switch
  • Idle timer shutdown
  • Idle timer between air temperatures
  • Vehicle ID number (VIN)
  • Idle adjustment
  • Progressive shifting
  • Engine protection

DDEC III IV System Series 60 Diesel Engine DDEC III/IV System Series 60 Diesel Engine

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September 28th, 2011 at 4:06 am

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