793F and 797F Off-Highway Trucks Power Train Electronic Control System Caterpillar


Diagnostic Code List

Usage:

793F D3T
Use the "Advisor" module or the Cat® Electronic Technician (Cat® ET) to determine the diagnostic codes for the ECM. After determining the diagnostic codes, refer to the corresponding test procedure for more information. Perform the procedure that corresponds to the Component Identifier (CID) and the Failure Mode Identifier (FMI) of the diagnostic code. The following table is a list of possible diagnostic codes for the ECM.

Table 1
Diagnostic Codes For the Transmission ECM Module Identifier "(MID)" No. 081
(1) 
Perform the procedure that corresponds to the "CID" and the "FMI" of the diagnostic code during troubleshooting. 
"CID" and "FMI"  Component 
"CID" 41 Sensor Power Supply (8 DCV) 
FMI 3  Voltage above normal 
FMI 4  Voltage below normal 
"CID" 127 Transmission Oil Pressure Sensor 
FMI 3  Voltage above normal or shorted high 
FMI 4  Voltage below normal or shorted low 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 168 Electrical System Voltage 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 3  Voltage above normal or shorted high 
FMI 4  Voltage below normal or shorted low 
"CID" 177 Sensor (Transmission Oil Temperature) 
FMI 3  Voltage above normal or shorted high 
FMI 4  Voltage below normal or shorted low 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 190 Speed Sensor (Engine) 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 248 Cat Data Link 
FMI 9  Abnormal update rate 
"CID" 533 Brake Control 
FMI 9  Abnormal update rate 
FMI 14  Special Instruction 
"CID" 585 Speed Sensor (No. 1) (Transmission Output) 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 7  Not responding properly 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 590 Engine Control Module 
FMI 9  Abnormal update rate 
FMI 14  Special instruction 
"CID" 669 Speed Sensor (Transmission Input) 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 672 Torque Converter Output Speed Sensor 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 673 Speed Sensor (No. 2) (Transmission Output) 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 7  Not responding properly 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 674 Speed Sensor (No. 7) (Transmission Output) 
FMI 2  Data erratic, intermittent, or incorrect 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 709 Modulating Valve (Lockup Clutch) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 718 Transmission System 
FMI 13  Out of Calibration 
"CID" 800 VIMS Main Module 
FMI 9  Abnormal update rate 
FMI 14  Special instruction 
"CID" 826 Temperature Sensor (Torque Converter Oil) 
FMI 03  Voltage above normal or shorted high 
FMI 04  Voltage below normal or shorted low 
FMI 08  Abnormal frequency, pulse width, or period 
"CID" 967 Machine Application 
FMI 9  Abnormal update rate 
"CID" 1273 Chassis Control 
FMI 9  Abnormal update rate 
FMI 14  Special Instruction 
"CID" 1326 ECM Location Code 
FMI 2  Data Erratic, intermittent or incorrect 
"CID" 1401 Solenoid Valve (Forward High) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1402 Solenoid Valve (Forward Low) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1403 Solenoid Valve (Reverse) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1404 Solenoid Valve (Speed Clutch 2) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1405 Solenoid Valve (Speed Clutch 3) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1406 Solenoid Valve (Speed Clutch 1) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1407 Solenoid Valve (Speed Clutch 7) (Transmission) 
FMI 3  Voltage above normal or shorted high 
FMI 5  Current below normal 
FMI 6  Current above normal 
FMI 11  Failure mode not identifiable 
"CID" 1428 Requested Gear Command 
FMI 3  Voltage above normal 
FMI 4  Voltage below normal 
FMI 8  Abnormal frequency, pulse width, or period 
"CID" 1674 Solenoid Return (No. 1) 
FMI 5  Current below normal 
"CID" 1675 Solenoid Return (No. 2) 
FMI 5  Current below normal 
"CID" 1676 Solenoid Return (No. 3) 
FMI 5  Current below normal 
"CID" 2448 Graphical Display 
FMI 9  Abnormal update rate 
FMI 14  Special instruction 
(1) This table pertains only to diagnostic codes with a MID of 081.

Module Identifier (MID)

The "Advisor" displays maintenance events that originate from electronic controls. The events are shown on the message area. Other electronic control modules transfer this diagnostic information through the Cat Data Link to the "Advisor" module.

The electronic control module that has detected a failure is identified by the Module Identifier (MID). Each electronic control module on the machine has a unique MID. Use table 2 to match the MID for each failure to an electronic control module. Refer to the "Module Identifier table" on the machine Electrical System Schematic if the MID that is shown does not appear in table 2. After the electronic control module that detected the failure has been identified, refer to the failed controls Service Manual for troubleshooting information ("CID/FMI"). The Service Manual modules for each control are part of the machine Service Manual.

If the MID is for a "Advisor" module, use the Service Manual, KENR9022 module to troubleshoot the failure. This Service Manual, KENR8393 module contains troubleshooting procedures for the Power Train only. Refer to the Troubleshooting section of this manual for the individual diagnostic code procedures.

Note: Maintenance events that originate in other electronic controls may be automatically cleared from the control when the event is transferred to VIMS. The data events are not affected.

Table 2
Module Identifier (MID) Description 
MID No.  Description 
36  Engine Control Module 
53  Advisor Graphical Display Module 
81  Transmission Control Module 
87  Chassis Control Module 
116  Brake Control Module 
161  VIMS Main Module 
162  VIMS Application Module 

Component Identifier (CID)

The Component Identifier (CID) is a code that describes the component that may have a failure. The "MID/CID/FMI" can be used to see the whole story.

Failure Mode Identifier (FMI)

Each Failure Mode Identifier (FMI) is defined by SAE standards. The Caterpillar definitions that are listed here are applied to Caterpillar products. The relationship between sensors and FMI codes is shown in Illustration 1. The types of sensors are listed here: frequency sensors, analog sensors, and digital sensors.



Illustration 1g00490995

Caterpillar Information System:

793F and 797F Off-Highway Trucks Power Train Electronic Control System MID 081 - CID 0248 - FMI 09
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