Category: TROUBLESHOTING

Welding on a Machine that is Equipped with an Electronic Ecm

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Welding on a Machine that is Equipped with an Electronic Engine Control System
Proper welding procedures are necessary in order to avoid damage to the engine’s electronic control module, sensors, and associated components. The component that requires welding should be removed. When welding on a machine that is equipped with an electronic engine control system and removal of the component is not possible, the following procedure must be followed. This procedure provides the minimum amount of risk to the electronic components.

NOTICE
Do not ground the welder to electrical components such as the ECM or sensors. Improper grounding can cause damage to the drive train bearings, hydraulic components, electrical components, and other components.
Clamp the ground cable from the welder to the component that will be welded. Place the clamp as close as possible to the weld. This will help reduce the possibility of damage.

Stop the engine. Turn the keyswitch to the OFF position.
Disconnect the negative battery cable from the battery. If a battery disconnect switch is installed, open the switch.

Illustration 1 – The welding current will not cause damage to any of the associated components.
Connect the welding ground cable as close as possible to the area that will be welded. Components which may be damaged by welding include bearings, hydraulic components, and electrical/electronic components. Protect the wiring harness from welding debris and from spatter.
Weld the materials by using standard welding methods.

Delphi EUI injector faults

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Delphi Diesel Fuel Injectors are a family of highly versatile mechanical products that can be adapted for use in a wide range of light duty, medium duty and heavy duty fuel systems for both direct injection and indirect injection diesel engines. They are precisionengineered for both mechanically- and electronically-controlled pump line nozzle systems. They can be configured in conventional bar-type designs for axial-feed or side-feed, or forged body designs for a variety of angled side-feed applications.
The nozzle valve of Delphi Diesel Fuel Injectors is mechanically closed by a high stress-capable spring, and the opening pressure is accurately set by high precision shims. Their proven, cost effective technology and application flexibility provide manufacturers with excellent value.

E003The pumping mechanism is identical to an “In line” or single-cylinder pump. The plunger, which is driven by the camshaft, moves up and down in the body. Fuel, under pressure, moves freely from engine fuel manifold, through the injector, and back into the manifold. At a certain point during the down-stroke, current is applied to the actuator. This current generates a magnetic field within the actuator and causes a high pressure valve to close.

Once this valve is closed, fuel cannot exit the injector back into the engine fuel manifold. The action of the plunger upon the fuel creates very high pressure. This pressure quickly overcomes the mechanical (spring) force holding the nozzle needle on its seat

Diagnostic Error Code Information

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Diagnostic Code Information for Caterpillar Electronic Control

 

The following Diagnostic Code information is used with Caterpillar machines that are equipped with Caterpillar Electronic Controls.

Module (MID), Component (CID), and Failure Mode (FMI), are information identifiers that help service personnel diagnose the system problems of a Caterpillar machine.

A Component Identifier (CID) is a diagnostic code that informs the service personnel of the specific circuit or system within which a problem was detected.

Failure Mode Identifiers (FMI) are diagnostic codes that inform service personnel of the type of problem that has been detected within a circuit or system.

A Module Identifier (MID) is a diagnostic code that identifies the electronic control module that has diagnosed a fault.

Event Codes identify significant events that occur to the systems of the machine. The ECM stores data from the events. This function allows tracking the performance history of the machine. The data is used as an aid for Managers, Service, and Maintenance personnel.

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