Case CX290B Crawler Excavator Service Manual

Table of Contents

1. General Information
2. Engine
3. Fuel System
4. Electrical System
5. Undercarriage
6. Drive Train
7. Undercarriage Hydraulics
8. Upper structure Hydraulics
9. Upper structure

Manual Extract: Checking the start system

Checking the start system consists of a systematic method of searching for the reason the engine will not start. The following items are prerequisites for performing this diagnosis.

• Battery is fully charged and battery cable is securely attached.
• Engine speed during cranking is normal.
• Sufficient amount of fuel is filled.
• No air is mixed in with fuel.
• No abnormalities in air cleaner element and fuel filter.
• Correct fuel is being used.

Important:
If a diagnostic trouble code related to the fuel system has been detected, first perform diagnostic trouble code diagnosis.
Diagnostic aid
When there is a diagnostic trouble code related to the CKP sensor and CMP sensor, the engine will not start unless the memory is cleared.

If an intermittent problem is suspected, the cause may be one of the following.
• Harness connector connection problem
• Harness routing problem
• Breakage in harness covering due to friction
• Wire disconnection within harness covering

In order to detect these causes, the following inspection is necessary.
• Harness connector and ECM connector connection problem
– Terminal has come out from connector
– Connection between non-matching terminals
– Damage to connector lock
– Terminal and wire connection problem