3412E Petroleum 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. Not all diagnostic codes have a unique flash code.

Note: Flash codes should only be used to indicate the nature of a diagnostic condition. Do not use flash codes to perform detailed troubleshooting.

Use the following procedure to retrieve the diagnostic codes if the application is equipped with an engine DIAGNOSTIC 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.
Turn the start/run 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 start/run switch is in the ON position.
The "DIAGNOSTIC" lamp blinks on and off at five second intervals.
- When the start/run 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.
Active diagnostic codes will always be flashed. There is no toggle switch that will shut off the lamp.

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.

Possible Performance Effect of Active Diagnostic Codes

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Table 1
	Diagnostic Flash Code and Engine Performance sheet for 3412E Petroleum engines
Diagnostic Flash Code		Effect On Engine Performance			Suggested Operator Action
Diagnostic Flash Code		Engine Misfire	Low Power	Reduced Engine Speed	Shut down the Engine	Service	Schedule Service.
13	Fuel temperature open/short to +batt		X				X
13	Fuel temperature short to ground		X				X
14	Injection Actuation Pressure Control Valve open circuit	X	X	X	X		X
14	Injection Actuation Pressure Control Valve short to ground	X	X	X	X		X
17	Battery voltage above normal		⁽¹⁾				X
17	Battery voltage below normal	X	X	X		X
17	Battery voltage intermittent	X	X	X		X
21	Analog supply open/short to + batt		X				X
21	Analog supply short to ground		X				X
21	Digital supply short to +batt		X				X
21	Digital supply short to ground		X				X
24	Engine oil pressure open/short to +batt		X		X		X⁽²⁾
24	Engine oil pressure short to ground		X	X	X		X⁽²⁾
25	Turbocharger outlet pressure signal above normal		X				X
25	Turbocharger outlet pressure signal open/short to +batt		X				X
25	Turbocharger outlet pressure signal short to ground		X				X
26	Atmospheric pressure open/short to +batt		X	X	X		X
26	Atmospheric pressure short to ground		X		X		X
27	Engine coolant temperature open/short to +batt	X	X	X	X		X
27	Engine coolant temperature short to ground	X	X	X	X		X
28	Throttle Position Sensor calibration required			X	X		X
32	Throttle position signal abnormal			X	X		X
34	Loss of engine speed signal	X			X⁽³⁾		X
34	Engine speed open/short to +batt	X		X	X⁽³⁾		X
34	Engine speed sensor mis-installed	X			X⁽³⁾		X
34	Engine speed abnormal	X			X⁽³⁾	X
34	Loss of secondary engine speed signal	X			X⁽³⁾		X
34	Secondary engine speed open/short to +batt	X			X⁽³⁾		X
34	Secondary engine speed signal abnormal	X			X⁽³⁾		X
37	Fuel pressure open/short to +batt		X				X
37	Fuel pressure short to ground		X				X
37	Engine oil temperature open/short to +batt			⁽¹⁾			X
37	Engine oil temperature short to ground			⁽¹⁾			X
38	Inlet manifold air temperature open/short to +batt		X				X
38	Inlet manifold air temperature short to ground		X				X
42	Atmospheric pressure calibration required		X				X
42	Turbocharger outlet pressure calibration required		X				X
42	Engine timing calibration required	X	X	X		X
43	Injector actuation pressure open/short to +batt		X			X
53	ECM error	X	X	X	X		X
56	Personality module mismatch		⁽⁴⁾		X		X
56	Check programmable parameters		X		X		X
64	Transmission oil pressure open/short to +batt		⁽⁵⁾			X
64	Transmission oil pressure short to ground		⁽⁵⁾			X
67	Transmission oil temperature open/short to +batt		⁽¹⁾				X
67	Transmission oil temperature short to ground		⁽¹⁾				X
71	Injector cylinder 1 open circuit	X	X			X
71	Injector cylinder 1 short circuit	X	X			X
72	Injector cylinder 2 open circuit	X	X				X
72	Injector cylinder 2 short circuit	X	X			X
73	Injector cylinder 3 open circuit	X	X				X
73	Injector cylinder 3 short circuit	X	X			X
74	Injector cylinder 4 open circuit	X	X			X
74	Injector cylinder 4 short circuit	X	X			X
75	Injector cylinder 5 open circuit	X	X			X
75	Injector cylinder 5 short circuit	X	X			X
76	Injector cylinder 6 open circuit	X	X			X
76	Injector cylinder 6 short circuit	X	X			X
77	Injector cylinder 7 open circuit	X	X			X
77	Injector cylinder 7 short circuit	X	X			X
78	Injector cylinder 8 open circuit	X	X			X
78	Injector cylinder 8 short circuit	X	X			X
81	Injector cylinder 9 open circuit	X	X			X
81	Injector cylinder 9 short circuit	X	X			X
82	Injector cylinder 10 open circuit	X	X			X
82	Injector cylinder 10 short circuit	X	X			X
83	Injector cylinder 11 open circuit	X	X			X
83	Injector cylinder 11 short circuit	X	X			X
84	Injector cylinder 12 open circuit	X	X			X
84	Injector cylinder 12 short circuit	X	X			X

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⁽¹⁾	No performance effect
⁽²⁾	Engine Monitoring must be programmed to Derate mode or Shutdown mode before the power and engine rpm are reduced. Engine Monitoring must be programmed to Shutdown mode before the engine will be shutdown.
⁽³⁾	If both the primary speed/timing sensor and the backup speed/timing sensor fail, a shutdown will occur.
⁽⁴⁾	Engine shutdown
⁽⁵⁾	A Code is stored in memory.

The ECM can log events. Events refer to engine operating conditions such as low oil pressure or high coolant temperature. Table 2 is a cross-reference for event codes. Logged events usually indicate a mechanical problem instead of an electronic system problem.

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Table 2
Cross-Reference for Event Codes
Flash Codes	EID Codes	Description of Code
61	016	High engine coolant temperature shutdown
61	017	High engine coolant temperature warning
46	040	Low engine oil pressure shutdown
37	053	Low fuel pressure warning
62	058	Low engine coolant level shutdown
62	059	Low engine coolant level warning
46	100	Low engine oil pressure warning
21	164	High injector actuation pressure
35	190	Engine overspeed warning