3512 and 3516 EUI Engines for 784B, 785B, 789B and 793B Off-Highway Trucks Diagnostic Codes Caterpillar


Diagnostic Codes
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1.1. Active Diagnostic Codes
2.1. Logged Diagnostic Codes
3.1. Diagnostic Flash Codes
4.1. Diagnostic Terminology

Diagnostic codes alert the operator that an electrical problem exists in the circuit. Diagnostic codes indicate the nature of the problem to the service technician. Diagnostic codes consist of the module identifier (MID), the component identifier (CID) and the failure mode identifier (FMI). The MID indicates the electronic control module that generated the diagnostic code. The MID for the Engine's Electronic Control Module (ECM) is 36. The CID indicates the component in the system that is experiencing the problem. The FMI indicates the type of failure that is present. Diagnostic codes may be viewed on the AVSpare Electronic Technician (ET).

The service technician may use the diagnostic enable switch on the operator's panel in order to display the diagnostic code as a flash code if the Cat ET is not available.

Note: Do not confuse diagnostic codes with diagnostic events. Event codes alert the operator that an abnormal operating condition such as low oil pressure has been detected.

Active Diagnostic Codes

An active diagnostic code represents a problem with the electronic control system. Correct this problem as soon as possible. When an active diagnostic code is generated, a display module such as the Electronic Monitoring System (EMS) may produce a warning.

Logged Diagnostic Codes

When the ECM generates a diagnostic code, the ECM logs the code in permanent memory. The ECM has an internal diagnostic clock. The ECM will record the hour of the first occurrence of the diagnostic code. The ECM will record the hour of the last occurrence of the diagnostic code. The ECM will record the number of occurrences of the code. This information is a valuable indicator for troubleshooting intermittent problems. Any logged diagnostic codes will automatically be deleted if no additional occurrences are recorded in 100 hours. Some diagnostic codes may log occurrences that did not result in complaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next likely cause is a component failure. The least likely cause is the failure of the ECM. Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.

If the symptoms continue, use the proper procedure for troubleshooting the symptoms that have been experienced by the operator.

Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.




Illustration 1g00592364

The Illustration 1 indicates output voltage from the coolant temperature sensor. The normal output range of the sensor is between 0.2 VDC and 4.8 VDC. If the sensor or wiring to the sensor becomes open or shorted, a diagnostic code will be generated. The diagnostic code will remain active until the condition disappears or the condition is corrected. The diagnostic code will be logged in the memory of the ECM. Cat ET can be used to turn ON the engine monitoring for a specific sensor. When the monitoring is turned ON, the sensor's value and any diagnostic event code will appear on Cat ET. When the features are turned OFF, the engine monitoring will be disabled, but the event is logged in the ECM.

Diagnostic Flash Codes

The service technician may use the diagnostic enable switch on the operator's panel in order to access "ACTIVE" diagnostic flash codes. Flash codes are used to represent diagnostic codes in the electronic system in order to alert the operator that a problem exists. The flash codes are a two digit number. A series of flashes represents the flash code on the service engine lamp. The service engine lamp is located on the operator's panel. Use the following procedure in order to access flash codes.

  • Turn the keyswitch to the ON position. The engine should be off.

  • Push the diagnostic enable switch.

  • If the service engine lamp was not illuminated, the service engine lamp will flash on and off for 5 times. The service engine lamp will remain off for one second. The service engine lamp will flash on and off for five times. The service engine lamp will then remain off. The code 55 indicates that no diagnostic code was present.

  • If the service engine lamp was illuminated, the service engine lamp will stay illuminated for another five seconds. The service engine lamp will then turn off. The service engine lamp will begin to flash the first number of the two digit flash code. The service engine lamp will turn off for one second. The service engine lamp will flash the second number of the two digit code.

  • If two or more diagnostic flash codes are present, the next diagnostic code will begin to flash after a three second delay. The following codes will be displayed in the same manner as the first code.

  • Refer to the following example.

EXAMPLE

Note: Flash Code 27 would flash on the diagnostic lamp in the following manner.

  • Two short flashes with approximately 0.3 seconds between flashes.

  • One second hesitation

  • Seven short flashes with approximately 0.3 seconds between flashes.

Note: Flash codes can represent more than one diagnostic code. Make a note of all of the diagnostic codes that are represented by a particular flash code. Refer to Table 1. The engine does not need to be started in order to view diagnostic Flash codes.

Diagnostic Terminology

Table 1
3500B System Diagnostic Codes    
Flash Codes     CID     FMI     Description    
55     NONE     NONE     No "ACTIVE" Diagnostic Codes    
71     0001     05     Injector Cylinder 1 open circuit    
71     0001     06     Injector Cylinder 1 short    
72     0002     05     Injector Cylinder 2 open circuit    
72     0002     06     Injector Cylinder 2 short    
73     0003     05     Injector Cylinder 3 open circuit    
73     0003     06     Injector Cylinder 3 short    
74     0004     05     Injector Cylinder 4 open circuit    
74     0004     06     Injector Cylinder 4 short    
75     0005     05     Injector Cylinder 5 open circuit    
75     0005     06     Injector Cylinder 5 short    
76     0006     05     Injector Cylinder 6 open circuit    
76     0006     06     Injector Cylinder 6 short    
77     0007     05     Injector Cylinder 7 open circuit    
77     0007     06     Injector Cylinder 7 short    
78     0008     05     Injector Cylinder 8 open circuit    
78     0008     06     Injector Cylinder 8 short    
81     0009     05     Injector Cylinder 9 open circuit    
81     0009     06     Injector Cylinder 9 short    
82     0010     05     Injector Cylinder 10 open circuit    
82     0010     06     Injector Cylinder 10 short    
83     0011     05     Injector Cylinder 11 open circuit    
83     0011     06     Injector Cylinder 11 short    
84     0012     05     Injector Cylinder 12 open circuit    
84     0012     06     Injector Cylinder 12 short    
85     0013     05     Injector Cylinder 13 open circuit    
85     0013     06     Injector Cylinder 13 short    
86     0014     05     Injector Cylinder 14 open circuit    
86     0014     06     Injector Cylinder 14 short    
87     0015     05     Injector Cylinder 15 open circuit    
87     0015     06     Injector Cylinder 15 short    
88     0016     05     Injector Cylinder 16 open circuit    
88     0016     06     Injector Cylinder 16 short    
32     0091     08     Throttle Position signal abnormal    
24     0100     03     Engine Oil Pressure open/short to +batt    
24     0100     04     Engine Oil Pressure short to ground    
42     0100     13     Engine Oil Pressure calibration required    
25     0102     00     Boost Pressure above normal    
25     0102     01     Boost Pressure below normal    
27     0110     03     Engine Coolant Temperature open/short to +batt    
27     0110     04     Engine Coolant Temperature short to ground    
17     0168     00     System Voltage High    
17     0168     01     System Voltage Low    
17     0168     02     System Voltage intermittent    
34     0190     02     Loss of Engine Speed signal    
34     0190     08     Engine Speed signal abnormal    
54     0248     09     AVS Data Link not communicating    
52     0253     02     Personality Module mismatch    
53     0254     12     Electronic Control Module Error    
-     0261     13     Engine Timing calibration required    
21     0262     03     5 Volt Sensor DC Power Supply short to +batt    
21     0262     04     5 Volt Sensor DC Power Supply short to ground    
21     0263     03     Digital Sensor Supply short to +batt    
21     0263     04     Digital Sensor Supply short to ground    
12     0267     02     Incorrect Engine Shutdown Switch inputs    
56     0268     02     Check Programmable Parameters    
25     0272     03     Turbo Out High Pressure open/short to +batt    
25     0272     04     Turbo Out High Pressure short to ground    
42     0272     13     Turbo Out High Pressure calibration required    
25     0273     00     Turbo Outlet Pressure above normal    
25     0273     03     Turbo Outlet Pressure open/short to +batt    
25     0273     04     Turbo Outlet Pressure short to ground    
42     0273     13     Turbo Outlet Pressure calibration required    
26     0274     03     Atmospheric Pressure open/short to +batt    
26     0274     04     Atmospheric Pressure short to ground    
42     0274     13     Atmospheric Pressure calibration required    
29     0275     03     Right Turbo Inlet Pressure open/short to +batt    
29     0275     04     Right Turbo Inlet Pressure short to ground    
42     0275     13     Right Turbo Inlet Pressure calibration required    
39     0276     03     Left Turbo Inlet Pressure open/short to +batt    
39     0276     04     Left Turbo Inlet Pressure short to ground    
42     0276     13     Left Turbo Inlet Pressure calibration required    
16     0281     05     Engine Lamp open/short to +batt    
16     0281     06     Engine lamp short to ground    
16     0282     05     Engine Overspeed Lamp open/short to +batt    
16     0282     06     Engine Overspeed Lamp short to ground    
16     0283     05     Filter Restrict Lamp open/short to +batt    
16     0283     06     Filter Restrict Lamp short to ground    
18     0284     05     EMS System Enable open/short to ground    
18     0284     06     EMS System Enable short to +batt    
18     0285     05     EMS Coolant Lamp open/short to +batt    
18     0285     06     EMS Coolant Lamp short to +batt    
18     0286     05     EMS Oil Lamp open/short to ground    
18     0286     06     EMS Oil Lamp short to +batt    
14     0291     11     Engine Cooling Fan Solenoid open/short    
15     0526     11     Wastegate Valve open/short    
33     0544     08     Engine Cooling Fan Speed signal abnormal    
28     0829     03     Rear Aftercooler Temperature open/short to +batt    
28     0829     04     Rear Aftercooler Temperature short to ground    
31     0830     03     Front Brake Oil Temperature open/short to +batt    
31     0830     04     Front Brake Oil Temperature short to ground    

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