Fault Code 187: Idle Governor Fueling Inhibit
J1939: SA 3 SPN 7830 FMI 9, 13, 19
Overview
The Transmission Control Module (TCM) sends and receives the Idle Governor Fueling Inhibit (IGFI) message from the Engine Electronic Control Unit (ECU) over the Primary Data Link. This message is used by the TCM to confirm the Engine ECU is receiving and responding to the requested fueling limit.
Detection
The TCM monitors the IGFI message. If the message is not received or invalid, the TCM sets the fault code active.
Conditions to Set Fault Code Active
FMI 9 - Abnormal Update Rate: The engine ECU did not respond to a request from the TCM IGFI message.
FMI 13 – Out Of Calibration: IGFI message not available for 30 seconds.
FMI 19 – Received Network Data In Error: The Engine ECU transmitted the IGFI message to the TCM in error.
Fallback
All FMIs:
- Amber warning lamp on
- No degraded modes
Note: Vehicle may have additional fallback modes.
Conditions to Set Fault Code Inactive
All FMIs: IGFI message received and valid for 10 seconds.
Possible Causes
All FMIs:
- Vehicle Components
- Engine ECU software configuration incompatible
Note: Refer to OEM for troubleshooting a failed system.
Additional Tools
- None
Fault Code 187 Troubleshooting
Set vehicle parking brake and chock wheels.
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 187 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 187 FMI 13 is Active, refer to OEM and enable vehicle Transmission Idle Governor Fueling Inhibit Support SPN 7830. Go to Step V
If Fault Code 187 FMI 13 is Inactive, Go to Step V
If Fault Code 187 FMI 9, 19 is Active or Inactive, there is a fault with the Idle Governor Fueling Inhibit message sent from a vehicle module. Contact OEM for further diagnostic instructions. Go to Step V
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go to “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and the vehicle operates properly, test complete.
If Fault Code 187 sets Active during operation, Go to Step A
If a fault code other than 187 sets Active, troubleshoot per Fault Code Isolation Procedure Index.