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| Illustration 1 | g01448473 |
Schematic of the Primary Steering Pressure Switch | |
The diagnostic codeCID 0793 FMI 04 can only be recorded if the optional secondary steering system is installed. The primary steering pressure switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation.
The code FMI 04 means that the ECM has determined that both contacts are grounded.
| Primary Steering Pressure Switch | ||
|---|---|---|
| Switch Position | 417-GY Circuit N/O J2-37 |
484-YL Circuit N/C J2-38 |
| Low Pressure | Open | Closed |
| High Pressure | Closed | Open |
Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0793 FMI 04 is active before performing this procedure.
Test Step 1. CHECK THE SWITCH
- Turn the starter keyswitch and the disconnect switch to the OFF position.
- Disconnect the transmission harness from the switch.
- Turn the starter keyswitch and the disconnect switch to the ON position.
Expected Result:
The code CID 0793 FMI 04 has been replaced by code CID 0793 FMI 03.
Results:
- OK - The code CID 0793 FMI 04 has been replaced by code CID 0793 FMI 03. The transmission harness and the ECM are correct. Proceed to Test Step 3.
- NOT OK - The code CID 0793 FMI 04 is still active. Proceed to Test Step 2.
Test Step 2. CHECK THE HARNESS
- Turn the disconnect switch and the starter keyswitch to the OFF position.
- The transmission harness remains disconnected from the switch.
- Disconnect the connectors of the transmission harness from the ECM.
- At the connector of the transmission harness for the ECM, measure the resistance from contact J2-38 (wire 484-YL) and contact J2-37 (wire 417-GY) of the transmission harness to all the contacts that are used in the connectors of the transmission harness of the ECM.
Expected Result:
Each resistance measurement is greater than 5000 ohms.
Results:
- YES - Each resistance measurement is greater than 5000 ohms. The ECM has failed.
Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the ECM requires replacement, see Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - One or more of the measurements were less than 5 ohms. There is a short in the transmission harness.
Repair: The short is between wire 484-YL and the circuit with the lowest resistance measurement, or the short is between wire 417-GY and the circuit with the lowest resistance measurement. Repair the transmission harness or replace the transmission harness.
STOP
Test Step 3. CHECK THE OPERATION OF THE SWITCH (LOW PRESSURE)
Note: Do not run the engine during this test step. This will cause low system pressure to the primary steering pressure switch.
- Remove the jumper that was installed in the previous test step.
- The transmission harness remains disconnected from the switch.
- Connect one lead from a multimeter to contact A (wire c216-BK) of the harness connector for the switch.
- Connect the other lead from a multimeter to contact B (wire 417-GY) of the harness connector for the switch.
- Measure the resistance between contact A (wire C216-BK) and contact B (wire 417-GY). Note the resistance.
- Disconnect the lead from contact B (wire 417-GY) and connect the lead to contact C (wire 484-YL).
- Measure the resistance between contact A (wire C216-BK) and contact C (wire 484-YL).
Expected Result:
The resistance from contact A to contact C is less than 5 ohms, and the resistance from contact A to contact B is greater than 5000 ohms.
Results:
- YES - The resistance from contact A to contact C is less than 5 ohms, and the resistance from contact A to contact B is greater than 5000 ohms. The switch is operating correctly. Proceed to Test Step 4.
- NO - The resistance from contact A to contact C is not less than 5 ohms, or the resistance from contact A to contact B is not greater than 5000 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 4. CHECK THE OPERATION OF THE SWITCH (HIGH PRESSURE)
- Start the engine. This will cause the system pressure to activate the primary steering pressure switch.
- Connect one lead from a multimeter to contact A (wire C216-BK) of the harness connector for the switch.
- Connect the other lead from a multimeter to contact B (wire 417-GY) of the harness connector for the switch.
- Measure the resistance between contact A (wire C216-BK) and contact B (wire 417-GY). Note the resistance.
- Disconnect the lead from contact B (wire 417-GY) and connect the lead to contact C (wire 484-YL).
- Measure the resistance between contact A (wire C216-BK) and contact C (wire 484-YL).
Expected Result:
The resistance from contact A to contact B is less than 5 ohms, and the resistance from contact A to contact C is greater than 5000 ohms.
Results:
- YES - The resistance from contact A to contact B is less than 5 ohms, and the resistance from contact A to contact C is greater than 5000 ohms. The switch is operating correctly. Proceed to Test Step 5.
- NO - The resistance from contact A to contact B is not less than 5 ohms, or the resistance from contact A to contact C is not greater than 5000 ohms. The switch has failed.
Repair: Replace the switch.
STOP
Test Step 5. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the contacts of the harness connectors and clean the connectors.
- Reconnect all harness connectors.
- Turn the disconnect switch and the starter keyswitch to the ON position.
- Operate the machine .
- Determine if the code CID 0793 FMI 04 is present.
Expected Result:
The code CID 0793 FMI 04 is active.
Results:
- YES - The code CID 0793 FMI 04 is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the ECM requires replacement, see Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The code CID 0793 FMI 04 is not active. The diagnostic code is not present. The diagnostic code does not exist at this time.
Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP