The engine ECM monitors engine coolant temperature in order to protect the engine from a problem with the coolant temperature. The coolant temperature sensor is mounted in the water jacket, close to the front of the engine. The exact location of the engine coolant temperature sensor varies depending on the engine model.
The GSC+P monitors the coolant temperature that is read by the engine ECM. The engine ECM sends the information to the GSC+P by the CAT data link.
The possible causes of a CID 0110 FMI 02 are listed below:
- There is an open circuit on the CAT data link between the engine ECM and the GSC+P.
- There is a problem with the temperature sensor that is connected to the engine ECM.
If a CID 0248 FMI 09 for the CAT data link is active, correct the diagnostic code prior to proceeding with this procedure.
System Response:
Note: The GSC+P is usually programmed to treat a problem with the coolant temperature sensor as an alarm fault. Setpoint P004 is 0. If the GSC+P is programmed to treat a problem with the oil pressure sensor as a shutdown fault, setpoint P04 is 1. If setpoint P04 is programmed to 1, the diagnostic code is automatically shown in the upper display.
Note: Diagnostic codes are created when the harness connector is disconnected from the GSC+P during the troubleshooting procedures. Clear these created diagnostic codes after the particular problem is corrected. In a properly operating system, when the harness connector is removed from the GSC+P, the following diagnostic codes are recorded.
Test Step 1. VERIFY THE DIAGNOSTIC CODE.
View the diagnostic code that is displayed on the upper display panel of the EMCP II+P. Determine if the diagnostic code is originating from the Engine ECM.
Expected Result:
There is a letter "E" after the number of the CID that is on the upper display panel of the EMCP II+P.
Results:
- YES - There is a letter "E" after the number of the CID that is on the upper display panel of the EMCP II+P.
Repair: Troubleshoot the diagnostic code for the Engine ECM. Refer to Troubleshooting, RENR9348 or System Operation Testing and Adjusting, RENR9968.
STOP
- NO - There is not a letter "E" after the number of the CID that is on the upper display panel of the EMCP II+P. Proceed to Test Step 2.
Test Step 2. CHECK FOR AN OPEN CIRCUIT ON THE CAT DATA LINK.
- Turn the ECS to the OFF/RESET position.
- Disconnect the harness connector from the GSC+P. Disconnect the harness connector from the engine ECM.
- At the harness connector for the engine ECM, connect a jumper wire between pin J1-9 and pin J1-3.
- At the harness connector for the GSC+P, measure the resistance between pin 19 and pin 20.
Expected Result:
The resistance that was measured between pin 19 and pin 20 is less than 5 ohms.
Results:
- OK - The resistance from pin 19 to pin 20 is less than 5 ohms. The CAT data link is correct.
Repair: There is a problem with the temperature sensor. On EUI engines, the temperature sensor is connected to the engine ECM. Reconnect the harness connectors for the engine ECM and the GSC+P. Refer to Troubleshooting, SENR1003, "3500B EPG Engines" or Troubleshooting, RENR2227, "3406E EPG Engines" for information on troubleshooting the temperature sensor.
STOP
- NOT OK - The resistance from pin 19 to pin 20 is greater than 5 ohms.
Repair: There is an open circuit in the CAT data link between the GSC+P and the engine ECM. Repair the wiring harness or replace the wiring harness.
STOP