C9 Industrial Engines Diagnostic Flash Code Retrieval Caterpillar


Diagnostic Flash Code Retrieval
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1.1. "Diagnostic" Lamp

"Diagnostic" Lamp

Use the "DIAGNOSTIC" Lamp or AVSpare Electronic Technician (ET) in order to determine the diagnostic flash code.

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

  1. Turn on the ignition system. 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.

  2. The Active Diagnostic codes will always be flashed. There is no toggle switch that will shut off the lamp.

  3. 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.

Table 1
  Diagnostic Flash Codes for C9 Engine 
Diagnostic Flash Code  Effect On Engine Performance  Suggested Action by the Operator 
Engine Misfire Low Power  Reduced Engine Speed  Engine Shut Down  Shut down the Engine(1)  Service(2)  Schedule Service for the Engine.(3) 
15  Open or Short Circuit of Injection Actuation Pressure Sensor           
17  High Injection Actuation Pressure           
18  Open or Short for the Injection Actuation Pressure Control Valve           
21  Sensor Supply Voltage Above Normal or Below Normal (4)           
24  Oil Pressure Sensor Fault (4)             
25  Inlet Manifold Air Pressure Sensor Fault(5)             
26  Atmospheric Pressure Sensor Fault(4)           
27  Coolant Temperature Sensor Fault(4)         
28  Check the Adjustments for the Throttle Position Sensor.         
34  Loss Of Engine RPM Signal         
35  Event for Engine Overspeed           
37  Fuel Pressure Sensor Fault(4)             
38  Inlet Manifold Air Temperature Sensor Fault(4)         
39  Mechanical Failure of the Injection Actuation Pressure Sensor           
42  Check the Calibration of the Timing Sensor.     
46  Low Oil Pressure Event         
51  Intermittent Battery Power to the ECM     
52  Personality Module Fault     
56  The following parameters must be checked: Customer and System          
59  Incorrect Engine Software       
61  Event for High Coolant Temperature       
62  Event for Low Coolant Level       
63  Low Fuel Pressure Event       
64  Even for High Inlet Manifold Air Temperature         
72  Fault of Cylinder 1 or Cylinder 2         
73  Fault of Cylinder 3 or Cylinder 4         
74  Fault of Cylinder 5 or Cylinder 6         
(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.

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