3406E and C15 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.
The "DIAGNOSTIC" lamp blinks on and off at five second intervals.
- When the ignition key is in the ON position, the lamp is checked for proper operation. If there are any active codes except for code 34, the codes are displayed at this time.
Note: The "DIAGNOSTIC" lamp will illuminate for five seconds. The lamp will stay on if there is an active diagnostic code.
The diagnostic codes will always be flashed. There is no toggle switch that will shut off the lamp.
The "DIAGNOSTIC" lamp will flash in order to indicate 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 flash codes. Table 1 also forms a list of electronic diagnostic codes and descriptions.

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Table 1
	Diagnostic Flash Code or Engine Performance Relationship for 3406E and C15 Marine Engine
Diagnostic Flash Code		Effect On Engine Performance			Suggested Operator Action
Diagnostic Flash Code		Engine Misfire	Low Power	Reduced Engine Speed	Shut down the Engine⁽¹⁾	Service⁽²⁾	Schedule Service⁽³⁾
13	Fuel Temperature Sensor Open/Short Circuit⁽⁴⁾						X
17	Battery Voltage Below Normal⁽⁴⁾						X
21	Sensor Supply Voltage Above/Below Normal⁽⁴⁾		X				X
24	Oil Pressure Sensor Open/Short Normal⁽⁴⁾						X
25	Inlet Manifold Air Pressure Sensor Open/Short⁽⁵⁾		X				X
26	Atmospheric Pressure Sensor Open/Short⁽⁴⁾						X
27	Coolant Temperature Sensor Open/Short⁽⁴⁾						X
28	Check Throttle Sensor Adjustments						X
32	Throttle Position Sensor Fault, Inlet Manifold Air Pressure Sensor Calibration			X		X
34	Loss Of Engine RPM Signal	X		X		X
35	Engine Overspeed Warning						X
38	Inlet Manifold Air Temperature Sensor Open/Short⁽⁴⁾						X
42	Check Timing Sensor Calibration		X				X
46	Low Oil Pressure Warning		X	X	X	X
51	Intermittent Battery Power to the ECM	X	X			X
52	Personality Module Fault	X	X	X		X
53	ECM Fault	X	X	X		X
56	Check Customer/System Parameters		X	X			X
59	Incorrect Engine Software	X	X	X			X
61	High Coolant Temperature Warning		X	X		X
62	Low Coolant Level Warning					X
64	High Inlet Manifold Air Temperature Warning, Marine Transmission Oil Pressure Open/Short						X
65	High Fuel Temperature Warning						X
67	Marine Transmission Oil Temperature Open/Short						X
72	Cylinder 1 & 2 Fault	X	X			X
73	Cylinder 3 & 4 Fault	X	X			X
74	Cylinder 5 & 6 Fault	X	X			X
81	High Oil Temperature Warning (Marine Transmission)					X
86	High Oil Pressure Warning (Marine Transmission)					X

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⁽¹⁾	Shut down the Engine: Operate the engine cautiously. Get immediate service. Severe engine damage may result.
⁽²⁾	The operator should go to the nearest location for service.
⁽³⁾	The operator should investigate the problem at a convenient time.
⁽⁴⁾	The Diagnostic Flash Codes reduce the effectiveness of the Engine Monitoring feature.
⁽⁵⁾	These Diagnostic Flash Codes may affect the system only under specific environmental conditions such as engine start-up at cold temperatures, etc.