3408 & 3412 HIGH PERFORMANCE MARINE ENGINES Caterpillar

NOTE: Before using this section, be sure that you have:

1. Gathered information about the complaint to adequately describe the symptoms.

2. Verified that the complaint is not due to normal engine operation.

3. Repaired all ACTIVE Diagnostic Codes.

Then, Identify probable causes using the procedure in this section which best describes the symptoms. Then narrow the probable causes using:

Operator Information

What happened, and when?

Under what conditions?

What else occurred?

When did the symptoms begin (and what else happened at that time)?

LOGGED Diagnostic Codes

Do they correlate to probable causes?

Did they occur at the same time as the symptoms?

Are some logged repeatedly?

Other Symptoms

Are they related to this symptom?

Do they have common probable causes?

Finally, test each probable cause using the tests suggested by the procedure. Be sure to check connectors, especially on intermittent problems!