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) messages to and from the engine Electronic Control Unit (ECU) over the Primary Data Link (J1939A). 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 IGFI messages. If messages are not received or are invalid, the fault is set Active.
Conditions to Set Fault Code Active
FMI 9 - Abnormal Update Rate: No response from Engine ECU to request from TCM IGFI message for 30 seconds.
FMI 13 – Out Of Calibration: IGFI message not available for 30 seconds.
FMI 19 – Received Network Data In Error: IGFI messages invalid for 30 seconds.
Fallback
FMI 9, 13, 19:
- Amber warning lamp on
- No degraded modes
Note: Vehicle may have additional fallback modes. Refer to OEM.
Conditions to Set Fault Code Inactive
FMI 9, 13, 19: IGFI messages received and valid for 10 seconds.
Possible Causes
FMI 9, 13, 19:
- Vehicle Components
- IGFI message not enabled
- Engine ECU mis-configured or internal failure
- Other vehicle ECU(s) faulted
- Vehicle Harness - Primary Data Link (J1939A)
- Wiring shorted to power, shorted to ground or open
- Terminals bent, spread, corroded, or loose
Note: Refer to OEM for troubleshooting a failed system.
Additional Tools
- None
Fault Code 187 Troubleshooting
Set vehicle parking brake and chock wheels.
Record transmission fault codes, FMIs, occurrences, and timestamps from 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 message (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, refer to OEM guidelines for repair of the vehicle Idle Governor Fueling Inhibit message (SPN 7830). Go to Step V
Key off.
Reconnect all connectors and verify 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 vehicle operates properly, test complete.
If Fault Code 187 sets Active, Go to Step A
If a fault code other than 187 sets Active, troubleshoot per Fault Code Isolation Procedure Index.