797B Off-Highway Truck: Diagnostic Code List

Table 1

Diagnostic Codes For Chassis ECM (MID No. 087) (1)
For troubleshooting, see the procedure with the same CID And FMI No.
CID / FMI	Description
CID 0041 - 8 V Sensor Supply:
FMI 03	Voltage above normal.
FMI 04	Voltage below normal.
CID 0144 - Relay (Backup Alarm):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 0168 - Electrical System Voltage:
FMI 01	Below normal range.
CID 0248 - CAT Data Link:
FMI 09	Abnormal update.
CID 0296 - Machine Electronics Control Module (Transmission):
FMI 02	Incorrect signal.
FMI 09	Abnormal update.
FMI 12	Failed device or component.
CID 0444 - Solenoid Valve (Air Start):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 0533 - Machine Electronics Control Module (Brake/Cooling):
FMI 02	Incorrect signal.
FMI 09	Abnormal update.
FMI 12	Failed device or component.
CID 0702 - Position Sensor (Transmission Shift Lever):
FMI 02	Incorrect signal.
CID 0773 - Position Sensor (Hoist Lever):
FMI 03	Voltage above normal.
FMI 04	Voltage below normal.
CID 0967 - Machine Application Incorrect:
FMI 02	Incorrect signal.
FMI 09	Abnormal update.
CID 1175 - Sensor Buffer (Body Position):
FMI 03	Voltage above normal.
FMI 04	Voltage below normal.
FMI 08	Abnormal signal.
CID 1236 - Lamp (Body Up Indicator):
FMI 03	Voltage above normal.
FMI 06	Current above normal.
CID 1237 - Proportional Solenoid (No. 1) (Hoist Pump Bypass):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1238 - Proportional Solenoid (No. 2) (Hoist Pump Bypass):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1239 - Proportional Solenoid (Control to Tank for Hoist Head End):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1240 - Proportional Solenoid (Control to Tank for Hoist Rod End):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1241 - Proportional Solenoid (Pump to Control for Hoist Head End):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1242 - Proportional Solenoid (Pump to Control for Hoist Rod End):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1243 - Solenoid Valve (Hoist Enable):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1245 - Relay (Accumulator Purge):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1326 - ECM Location Code:
FMI 02	Data Erratic, Intermittent, or Incorrect.
CID 1493 - Solenoid Valve (Steering Accumulator Charge):
FMI 03	Voltage above normal.
FMI 05	Current below normal.
FMI 06	Current above normal.
CID 1494 - Pressure Sensor (Steering Accumulator Oil):
FMI 03	Voltage above normal.
FMI 04	Voltage below normal.
FMI 08	Abnormal signal.
CID 1963 - Brake Pump Unloader Solenoid:
FMI 03	Voltage above normal
FMI 05	Current below normal
FMI 06	Current above normal

( 1 )

For the Chassis Electronic Control, the MID is 087. This chart pertains only to diagnostic codes with a MID of 087.

Module Identifier (MID)

System events from other electronic control modules are shown on the monitoring system. Other electronic control modules transfer this diagnostic information on the CAT data link to the monitoring system.

The module identifier (MID) identifies the electronic control module that detected the diagnostic code. Each electronic control module on the machine has a unique MID. Use the following chart in order to match the MID for each diagnostic code to a specific electronic control module. The chart for the Module Identifier (MID) is located on the Electrical System Schematic for your machine. See the chart if the MID is not shown on the display of your machine. After the operator has detected the diagnostic code, see the service manual module for that particular ECM for more troubleshooting information. The service manual for each ECM is part of the Service Manual.

If the MID is for the transmission ECM, use this service manual module. The MID for the transmission ECM is 081. If the MID is different use the appropriate module.

Table 2

Description of the Module Identifier
MID	Description
033	Engine ECM (Front)
034	Engine ECM (Rear)
036	Engine ECM (Master)
049	VIMS Main Module
081	Transmission ECM
087	Chassis ECM
116	Brake/Cooling ECM

Failure Mode Identifier

The codes for the Failure Mode Identifier are defined by the SAE standards. The following list contains a CAT version of definitions. The diagram that follows will help you understand the use of FMI with sensors.

Table 3

Failure Mode Indicator and Message Center Displays
FMI	Failure Description	Message Center Display
00	Data valid but above normal operating range	N/A
01	Data valid but below normal operating range	N/A
02	Data erratic, intermittent, or incorrect	INTERMITTENT
03	Voltage above normal or shorted high	SHORTED HI
04	Voltage below normal or shorted low	SHORTED LO
05	Current below normal or open circuit	LO AMPS OPEN
06	Current above normal or grounded circuit	HI AMPS GROUNDED
07	Mechanical system not responding properly	N/A
08	Abnormal frequency, pulse, or period	OUT OF RANGE
09	Abnormal update	NO RESPONSE
10	Abnormal rate of change	N/A
11	Failure mode not identifiable	UNKNOWN ERROR
12	Bad device or component	NO RESPONSE
13	Out of calibration	UNCALIBRATED
14	Not used	N/A
15	Not used	N/A
16	Parameter not available	NOT AVAILABLE
17	Module not responding	NO RESPONSE
18	Sensor supply fault	SNSR SUPPLY FAULT
19	Condition not met	N/A
20	Not used	N/A

Detailed FMI Explanation

FMI 00 Data Valid But Above Normal Operating Range - Every electronic control system sets a high limit for the expected operating range of the signal. The high limit includes over range signals. A sensor that is still operating but sending a signal above the expected limit will cause an FMI 00 to be stored.

Some of the possible causes of an FMI 00 diagnostic code are listed below.

• The signal is above normal.
• The signal is shorted to the +battery.
• The sensor requires calibration.

An FMI 00 diagnostic code is an example of a sensor that needs calibration. A PWM signal that is at a duty cycle of 80 percent is a valid signal. If the PWM signal has a duty cycle of 81 percent, the sensor is still working. However in this case, the sensor signal is above the expected signal limits.

FMI 01 Data Valid But Below Normal Operating Range - Every electronic control system sets a low limit for the expected operating range of the signal. The limit includes signals that are under the lower limit. The low signal could be the oil pressure signal. The sensor is still working but sending a signal below the expected limit will cause an FMI 01 to be stored.

Some of the possible causes of an FMI 01 diagnostic code are listed below.

• The signal is below the normal range.
• The timing is retarded.

This sensor is not expected to generate a PWM signal below a duty cycle of 5 percent with zero air pressure. If the sensor generates a signal with a duty cycle of 4 percent when the engine is shut down, the sensor is still working but sending a signal below the expected limit will cause an FMI 01 to be stored.

FMI 02 Data Erratic, Intermittent, or Incorrect - The signal from a component is present. The control that reads the diagnostic information cannot read the signal properly. The signal appears to be gone, unstable, or invalid. The data can be correct or incorrect intermittently. Also, this condition relates to communication between controls. An FMI 02 diagnostic code is an example of communication between controls. When the monitoring system is looking for the engine speed from the engine ECM over the Cat Data Link.

• There is a faulty connection.
• The signal is intermittent or erratic.
• The software has been changed.
• The signal is noisy.
• The signal is out of range.

FMI 03 Voltage Above Normal or Shorted High - The component or system voltage is higher than the limit. FMI 03 most often relates to a signal circuit.

Some of the components that could cause an FMI 03 diagnostic code are listed below.

• The sensor or the switch is faulty.
• The harness is damaged.
• The electronic control has failed.

Some of the possible causes of an FMI 03 diagnostic code are listed below.

• A sensor that has failed and the voltage output is high.
• Any wiring harness that has a sensor signal wire shorted to a high voltage. A high voltage is any voltage that is greater than the sensor supply voltage.
• A wiring harness that has an open circuit in the sensor signal wire will cause the control to pull up. When an open circuit occurs, the input circuit is pulled up to the supply voltage.
• A faulty control will also cause an FMI 03. This condition is unlikely.

FMI 04 Voltage Below Normal or Shorted Low - The component or system voltage is lower than the limit. FMI 04 most often relates to a signal circuit.

Some of the components that could cause an FMI 03 diagnostic code are listed below.

• The sensor or the switch is faulty.
• The harness is damaged.
• The electronic control has failed.

Some of the possible causes of an FMI 04 diagnostic code are listed below.

• A sensor that has failed and the voltage output is low.
• Any wiring harness that has a sensor signal wire shorted to ground.
• A faulty control will also cause an FMI 04. This condition is unlikely.

FMI 05 Current Below Normal or Open Circuit - The current through the component or the system is lower than the limit. FMI 05 is most often related to a driver circuit.

Some of the possible causes of an FMI 05 diagnostic code are listed below.

• There is an open circuit or a poor harness connection.
• There is an open relay.
• There is a switch in the open position.

FMI 06 Current Above Normal or Grounded Circuit - The current through the component or the system is higher than the limit. FMI 06 is most often related to a driver circuit. This fault is similar to FMI 04 diagnostic code.

Some of the possible causes of an FMI 06 diagnostic code are listed below.

• There is a short to ground in the harness connection.
• There is a shorted relay.
• A faulty control will also cause an FMI 06 diagnostic code. This condition is unlikely.

FMI 07 Mechanical System Not Responding Properly - The control detects a signal that is sent to a mechanical system and the response is not correct.

Some of the possible causes of an FMI 07 diagnostic code are listed below.

• The component responds improperly.
• The component is stuck in a position.
• The component has failed.
• The engine is shut down.
• The machine is being used improperly.

FMI 08 Abnormal Frequency, Pulse Width, or Period - This condition occurs when the signal is not in the expected range. The FMI 08 diagnostic code can also relate to a faulty sensor.

Some of the possible causes of an FMI 08 diagnostic code are listed below.

• The harness connections are intermittent or poor.
• The engine misfired.
• The signal is noisy due to nearby interference.
• There are loose mechanical devices.

FMI 09 Abnormal Update - This condition relates to communications on the data link. FMI 09 occurs when a control is not able to get information from another control.

Some of the possible causes of an FMI 09 diagnostic code are listed below.

• The control module is not communicating on the data link correctly.
• The rate of data transmission is abnormal.
• The data link has failed.
• There is a mismatch of software.

FMI 10 Abnormal Rate of Change - This condition relates to a signal that changes too fast. The rate of change is outside of the expected limit.

FMI 11 Failure Mode Not Identifiable - The control identifies more than one FMI as being responsible for a single failure.

Some of the possible causes of an FMI 11 diagnostic code are listed below.

• There is a mechanical failure.
• There is damage to multiple circuits.

FMI 12 Bad Device or Component - The electronic control sends a signal and the electronic control expects a response. The control receives no response or the response is incorrect.

Some of the possible causes of an FMI 12 diagnostic code are listed below.

• There is a failure of the electronic control.
• There is a failure on the data link.
• There are one or more controls with mismatched software.

FMI 13 Out of Calibration - The electrical signal is not within limits for a specific mechanical condition.

Some of the possible causes of an FMI 13 diagnostic code are listed below.

• Calibration is required.
• The data is out of range.

FMI 14, 15, and 20 - These codes are not active.

FMI 16 Parameter Not Available - The control does not support the requested parameter.

FMI 17 Module Not Responding - The control does not respond to the request for data.

FMI 18 Sensor Supply Failure - The sensor power supply in the control has failed.

FMI 19 Condition Not Met - The conditions that are defined by the software were not met.

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797B Off-Highway Truck: Diagnostic Code List 2012-12-25T18:26:00-08:00 Rating: 4.5 Diposkan Oleh: Unknown