SPN 1590 - FMI 2 (Fault Code 784)
Monday, July 02, 2018
Fault Codes CUMMINS GTA38 K38 K50 QSK38 QSK50/60 CM850,
Fault Codes CUMMINS Signature ISX QSX15 CM570
SPN1590 FMI2
Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect
CODES:
Fault Code: 784
PID(P), SID(S): S145
SPN: 1590
FMI: 2/2
Lamp: None
REASON: Loss of communication with adaptive cruise control.
EFFECT: Adaptive cruise control will not operate. Standard cruise control may not operate.
Circuit Description:
The adaptive cruise control system sends commands to the ECM via the J1939 data link to limit engine speed and maintain a set following distance behind a vehicle travelling more slowly than the current cruise control set speed.
Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) did not receive an expected message from the Adaptive Cruise Control module.
Action Taken When the Fault Code is Active:
• The ECM logs the fault code immediately when the diagnostic runs and fails.
The adaptive cruise control will not operate.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
If Adaptive Cruise Recovery is enabled, the driver can toggle the cruise enable switch from the OFF position to the ON position two times to get regular cruise control to operate and Fault Code 784 will go inactive. At the next key cycle, if the Heartbeat message is still not present, Fault Code 784 will go active.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 166 - FMI 2 (Fault Code 951)
SPN 1349 - FMI 7 (Fault Code 758)
Blog.Teknisi
Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect
 |
| Adaptive Cruise Control Circuit |
CODES:
Fault Code: 784
PID(P), SID(S): S145
SPN: 1590
FMI: 2/2
Lamp: None
REASON: Loss of communication with adaptive cruise control.
EFFECT: Adaptive cruise control will not operate. Standard cruise control may not operate.
Circuit Description:
The adaptive cruise control system sends commands to the ECM via the J1939 data link to limit engine speed and maintain a set following distance behind a vehicle travelling more slowly than the current cruise control set speed.
Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) did not receive an expected message from the Adaptive Cruise Control module.
Action Taken When the Fault Code is Active:
• The ECM logs the fault code immediately when the diagnostic runs and fails.
The adaptive cruise control will not operate.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
If Adaptive Cruise Recovery is enabled, the driver can toggle the cruise enable switch from the OFF position to the ON position two times to get regular cruise control to operate and Fault Code 784 will go inactive. At the next key cycle, if the Heartbeat message is still not present, Fault Code 784 will go active.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 166 - FMI 2 (Fault Code 951)
SPN 1349 - FMI 7 (Fault Code 758)
Blog.Teknisi
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