SPN 1590 - FMI 2 (Fault Code 784)
SPN1590 FMI2 (Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect)
Fault Code 784
CODES:
Fault Code: 784
PID(P), SID(S): S145
SPN: 1590
FMI: 2/2
Lamp: NONE
SRT:
REASON: Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect. 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 unit communicates with the electronic control module (ECM) sending and receiving vehicle speed control messages through the SAE J1939 data link.
Component Location:
The location of the adaptive cruise control unit will vary by original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for specific location.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes:
The ECM does not receive a valid J1939 message from the adaptive cruise control module for more than 1 second.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The adaptive cruise control will not operate.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
This fault is set active if the ECM does not receive the Heartbeat message from the adaptive cruise control unit on the SAE J1939 data link.
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.
Read More:
SPN 723 - FMI 2 (Fault Code 778)
SPN 703 - FMI 11 (Fault Code 779)
Blog.Teknisi
Fault Code 784
 |
| ISB, ISC, and ISL with CM2150 - Adaptive Cruise Control Circuit |
CODES:
Fault Code: 784
PID(P), SID(S): S145
SPN: 1590
FMI: 2/2
Lamp: NONE
SRT:
REASON: Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect. 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 unit communicates with the electronic control module (ECM) sending and receiving vehicle speed control messages through the SAE J1939 data link.
Component Location:
The location of the adaptive cruise control unit will vary by original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for specific location.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes:
The ECM does not receive a valid J1939 message from the adaptive cruise control module for more than 1 second.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The adaptive cruise control will not operate.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
This fault is set active if the ECM does not receive the Heartbeat message from the adaptive cruise control unit on the SAE J1939 data link.
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.
Read More:
SPN 723 - FMI 2 (Fault Code 778)
SPN 703 - FMI 11 (Fault Code 779)
Blog.Teknisi
0 Response to "SPN 1590 - FMI 2 (Fault Code 784)"
Post a Comment