3176C Engine 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 in order 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. The codes are displayed if there are any active codes that are different from code 34.
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 Relationship of Engine Performance for the 3176C Engine
Diagnostic Flash Code		Effect On Engine Performance			Suggested Action of Operator
Diagnostic Flash Code		Engine Misfire	Low Power	Reduced Engine Speed	Shut down the Engine⁽¹⁾	Service⁽²⁾	Schedule Service.⁽³⁾
13	Open or Short Circuit of Fuel Temperature Sensor⁽⁴⁾						X
21	Supply Voltage of Sensor is Above or Below Normal.⁽⁴⁾		X				X
24	Open or Short Circuit of the Oil Pressure Sensor to "+" Battery.⁽⁴⁾						X
25	Open or Short Circuit of Sensor for Inlet Manifold Air Pressure⁽⁵⁾		X				X
26	Open or Short Circuit for Atmospheric Pressure Sensor⁽⁴⁾						X
27	Open or Short Circuit for Coolant Temperature Sensor⁽⁴⁾						X
28	Check the Adjustments of the Throttle Sensor.						X
34	Loss of Engine RPM Signal	X		X		X
35	Engine Overspeed Warning						X
37	Open or Short Circuit of Fuel Pressure Sensor⁽⁴⁾						X
38	Open or Short Circuit of Sensor for Inlet Manifold Air Temperature⁽⁴⁾						X
42	Check the Calibration of the Timing Sensor.		X				X
46	Low Oil Pressure Warning		X	X	X	X
51	Intermittent Battery Power to the Electronic Control Module (ECM)	X	X			X
52	Personality Module Fault	X	X	X		X
56	Check the Customer and System Parameters.		X	X			X
59	Incorrect Engine Software	X	X	X			X
61	Warning for High Coolant Temperature		X			X
62	Low Coolant Level Warning					X
63	Warning for Low Fuel Pressure		X	X	X	X
64	Warning for High Inlet Manifold Air Temperature						X
65	Warning for High Fuel Temperature						X
72	Cylinder 1 and 2 Fault	X	X			X
73	Cylinder 3 and 4 Fault	X	X			X
74	Cylinder 5 and 6 Fault	X	X			X

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⁽¹⁾	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.