3412E and C30 Marine Engines Caterpillar

Diagnostic Flash Code Retrieval

Usage:

"Diagnostic" Lamp

Use the "DIAGNOSTIC" Lamp or a Caterpillar electronic service tool to determine the diagnostic flash code.

Use the following procedure to retrieve the diagnostic codes if the engine is equipped with a "DIAGNOSTIC" lamp:

Turn the ignition key to the ON position. The engine does not need to be started in order to view codes. The engine does not need to be running while the ignition switch is in the ON position.
- When the ignition key is in the ON position, the lamp is checked for proper operation. Any active codes are displayed at this time.
Note: The "DIAGNOSTIC" lamp will continue to flash codes for any active flash diagnostic codes.
The "DIAGNOSTIC" lamp will flash a two-digit code. The sequence of flashes represents the system diagnostic message. Each digit of the two-digit code is determined by counting the number of flashes. The lamp flashes at a rate of two times per second. The lamp will pause for one second between digits. The lamp will pause for two seconds between codes.

Table 1 indicates the potential effect on the engine performance with active diagnostic codes. Table 1 also forms a list of electronic diagnostic codes and descriptions.

Show/hide table

Table 1
Diagnostic Flash Code or Relationship of 3412E and C30 Marine Engine Performance
Diagnostic Flash Code		Effect On Engine Performance
Diagnostic Flash Code		Engine Misfire	Low Power	Reduced Engine Speed	Shutdown of the Engine
13	Fuel Temperature Sensor Fault		X
14	Injector Actuation Valve Fault	X	X	X	X
15	Fuel Level Sensor Fault
16	Low Fuel Level Warning
17	Battery Voltage Below Normal		X
21	Sensor Supply Voltage Fault		X
23	Engine Oil Temperature Sensor Fault		X
24	Engine Oil Pressure Sensor Fault		X	X
25	Turbo Outlet Pressure Fault		X
26	Atmospheric Pressure Sensor Fault		X
27	Engine Coolant Temperature Sensor Fault	X	X	X
28	Throttle Sensor Calibration			X
32	Throttle Position Sensor Fault			X
34	Engine Speed Sensor Fault	X			X⁽¹⁾
35	Engine Overspeed Warning
36	Unexpected Engine Shutdown
37	Fuel Delivery Pressure Sensor Fault
38	Inlet Air Manifold Temperature Sensor Fault		X
42	Check Sensor Calibration	X	X	X
42	Check Timing Sensor Calibration	X	X	X
42	Boost Pressure Sensor Calibration	X	X	X
43	Injector Actuation Pressure Sensor Fault		X
44	High Injection Actuation Pressure
45	Shut Off Solenoid
46	Low Oil Pressure Warning		X	X
46	Very Low Oil Pressure Warning		X	X
48	Excessive Engine Power
51	Intermittent Battery	X			X
52	Programmed Parameter Fault		X
53	ECM Fault	X	X	X	X
56	Personality Module Mismatch				X
56	CheckCustomer/System Parameters		X
58	Low Coolant Level Warning		X	X
58	Very Low Coolant Level Warning		X	X
59	Incorrect Engine Software				X
61	High Coolant Temperature Warning		X	X
61	Very High Coolant Temperature Warning		X	X
62	Engine Coolant Level Sensor Fault
63	Fuel Pressure Warning
64	High Inlet Air Temperature Warning		X	X
64	Very High Inlet Air Temperature Warning		X	X
65	High Fuel Temperature Warning
66	High Transmission Oil Temperature
67	Transmission Oil Temperature Sensor Fault
68	Transmission Oil Pressure Sensor Fault
69	High Transmission Oil Pressure Warning
71	Injector Cylinder #1	X	X
72	Injector Cylinder #2	X	X
73	Injector Cylinder #3	X	X
74	Injector Cylinder #4	X	X
75	Injector Cylinder #5	X	X
76	Injector Cylinder #6	X	X
77	Injector Cylinder #7	X	X
78	Injector Cylinder #8	X	X
81	Injector Cylinder #9	X	X
82	Injector Cylinder #10	X	X
83	Injector Cylinder #11	X	X
84	Injector Cylinder #12	X	X