Case CX470C Crawler Excavator Repair Manual

Manuals: Service Manual
General Information
Engine
Fuel System
Electrical System
Undercarriage
Drive Train
Upper structure Hydraulics
Upper structure
Hydraulic Schematics
Electrical Schematics
Manual Extract: Engine stalling
1. Engine stalling description of Symptom Engine cranks but takes a long time to start.
The engine ultimately operates, or starts but stops soon.
2. Engine stalling diagnostics
Preliminary inspection
Before using this section, perform the functional inspection and the OBD system check to check all of the following items.
Check the machine side for excessive loads.
The ECM and monitor are operating properly.
Abnormalities in the CKP sensor cannot be diagnosed without cranking of 14 revolutions or more.
Therefore, crank the engine for 14 seconds or more at 60 r/min.
DTC check.
In the case of the CKP sensor failure at low revolutions of the engine, DTCs of the CKP sensor may not be detected.
In case of an intermittent failure, etc., raise the engine revolutions to No Load Max to check whether DTCs related to the CKP sensor are detected.
The scan tool data is in the normal range of operation values.
Check the machine condition to locate the indicated symptom.
Check with the customer whether the customer is using the specified engine oil and fuel.
Check whether fuel is filled.
Visual inspection
Careful visual inspection is required for certain symptom procedures.
This can lead to correcting a problem without further inspections, saving valuable time.
The inspection covers the following items.
Poor connector connections.
Especially in the CKP sensor and CMP sensor.
Proper connections, tightening, and disconnection of wiring.
Branching the ECM power source for the commercial accessory power source.
Whether the ECM ground is clean and securely installed in the correct location.
Cracks, and twists in the pipes and hoses related to fuel, air, and oil, and correct connections thereof.
Extensively check for any leaks or blockage.
Fuel leaks and damage or dents on pipes in the fuel system.
Layout of the fuel filter, pre-filter, and electromagnetic pump constituting a structure that may cause air stagnant.
Isuzu genuine pre-filter has no air bleeding plug.
Therefore, check whether it is placed so that no air stagnant occurs.
Abnormalities in intake system parts Abnormalities in exhaust system parts