Basler Electric DGC-2020 - Manual (Page 82)

ECU Parameter Update Rate
∗
SPN
Note: Requests from the DGC-2020 to the Engine ECU for various parameters are made by issuing the request.
Address Claim Request Once on power up, and any time a Global Request for
Address Claim (GRAC) PGN is received. NA
Currently Active Diagnostic Trouble Codes
Request Whenever a refresh of Currently Active Diagnostic
Trouble Code Request is received. NA
Previously Active Diagnostic Trouble Codes
Request 2 s NA
Clear Currently Active Diagnostic Trouble
Codes Request Whenever a request to reset Currently Active Diagnostic
Trouble Code Request is made. NA
Clear Previously Active Diagnostic Trouble
Codes Request Whenever a request to reset Previously Active Diagnostic
Trouble Code Request is made. NA
Engine Hours/Revolutions Request 2 s NA
Fuel Consumption Request 2 s NA
Electronic Engine Controller #4 (Rated
Speed and Power) Request 2 s NA
Auxiliary Analog Information 2 s N/A
Data Transmitted to Marathon DVR2000E+ Voltage Regulator
Primary Voltage Setpoint 1 s N/A
Alternate Voltage Setpoint 1 s N/A
Voltage Adjustment Bandwidth 1 s N/A
Field Current 1 s N/A
Primary Underfrequency Knee-point 1 s N/A
Alternate Underfrequency Knee-point 1 s N/A
Underfrequency Slope 1 s N/A
∗ SPN is suspect parameter number.
Diagnostic Trouble Codes (DTCs)
The DGC-2020 obtains diagnostic engine information from a compatible engine control unit (ECU). The
DGC-2020 will receive an unsolicited message of a currently active diagnostic trouble code (DTC).
Previously active DTCs are available upon request. Active and previously active DTCs can be cleared on
request. Table 3-4 lists the diagnostic information that the DGC-2020 obtains over the CAN bus interface.
Table 3-4. Diagnostic Information Obtained Over the CAN bus Interface
Parameter
Transmission
Repetition Rate
Active diagnostic trouble code 1 s
Lamp status 1 s
Previously active diagnostic trouble code On request
Request to clear active DTCs On request
Request to clear previously active DTCs On request
DTCs are reported in coded diagnostic information that includes the Suspect Parameter Number (SPN),
Failure Mode Identifier (FMI), and Occurrence Count (OC). All parameters have an SPN and are used to
display or identify the items for which diagnostics are being reported. The FMI defines the type of failure
detected in the subsystem identified by an SPN. The reported problem may not be an electrical failure but
a subsystem condition needing to be reported to an operator or technician. The OC contains the number
of times that a fault has gone from active to previously active.
For certain DTCs, if the DGC-2020 recognizes a pair of SPN and FMI numbers, it displays a single string
as listed in Table 3-6. If the DGC-2020 recognizes an SPN in Table 3-6, but the FMI does not match the
FMI in Table 3-6, then it displays the string from Table 3-6 corresponding to the table entry where the FMI
is # and a second string corresponding to the FMI number listed in Table 3-5. For example, if the DGC-
2020 receives SPN 29 and FMI 13, it displays ACCEL PEDAL 2 POSITN and OUT OF CALIBRATION. If
3-8 DGC-2020 Functional Description 9400200990 Rev X