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| Illustration 1 | g00633940 |
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Schematic for the Modulating Valve for Speed 2 (Number 4) | |
This diagnostic code is for the Modulating Valve for Speed 2 (Number 4).
See Systems Operation, "Solenoid Valves" for help with the identification of the locations of the solenoids.
This diagnostic code is recorded when there is a speed difference between two transmission components.
System Response:
The components of the transmission should be locked by the clutch that corresponds to the recorded CID.
Test Step 1. CHECK FOR OTHER RECORDED DIAGNOSTIC CODES.
- View the log of the diagnostic codes. Check for recently logged diagnostic codes for speed sensors.
Expected Result:
There are other diagnostic codes that are active, or there are recently logged diagnostic codes for speed sensors.
Results:
- YES - There are other diagnostic codes that are active, or there are recently logged diagnostic codes for speed sensors.
Repair: Other diagnostic codes may indicate the reason for the speed difference between the transmission components that corresponds to the diagnostic codes. Exit this test procedure and perform the procedure for the diagnostic codes that are active or logged. The diagnostic codes for the speed sensor are listed: CID 0671 FMI 02, CID 0672 FMI 02, CID 0673 FMI 02, CID 0674 FMI 02 and CID 0675 FMI 02. Operate the machine. If the CID 0694 FMI 07 is still present, return to the test procedure for CID 0694 FMI 07.
STOP
- NO - There are not other diagnostic codes that are active. There are no logged diagnostic codes for speed sensors. Proceed to Test Step 2.
Test Step 2. CHECK THE SUPPLY PRESSURE.
- Check the supply pressure to the transmission modulating valves. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
Expected Result:
The supply pressure to the transmission modulating valves is correct.
Results:
- YES - The supply pressure to the transmission modulating valves is correct. Proceed to Test Step 4.
- NO - The supply pressure to the transmission modulating valves is not correct. Proceed to Test Step 3.
Test Step 3. RECHECK THE SUPPLY PRESSURE.
- Repair the cause of the incorrect supply pressure to the transmission modulating valves. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
- Operate the machine.
- Stop the machine and place the parking brake switch in the ON position.
- Determine if CID 0694 FMI 07 is present.
Expected Result:
CID 0694 FMI 07 is present.
Results:
- YES - CID 0694 FMI 07 is present. Proceed to Test Step 4.
- NO - CID 0694 FMI 07 is not present.
Repair: Resume normal machine operation.
STOP
Test Step 4. CHECK THE CLUTCH PRESSURE.
- Check the pressure to the reverse clutch. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
Expected Result:
The pressure for the reverse clutch is correct when the machine is in forward or reverse.
Results:
- YES - The pressure for the reverse clutch is correct when the machine is in forward or reverse. Proceed to Test Step 6.
- NO - The pressure for the reverse clutch is not correct when the machine is in forward or reverse. The pressure for the reverse clutch is incorrect. Proceed to Test Step 5.
Test Step 5. CHECK THE CLUTCH PRESSURE.
- Repair the cause of the incorrect reverse clutch pressure. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
- Operate the machine.
- Stop the machine and place the parking brake switch in the ON position.
- Determine if CID 0694 FMI 07 is present.
Expected Result:
CID 0694 FMI 07 is still active.
Results:
- YES - CID 0694 FMI 07 is still active. Proceed to Test Step 6.
- NO - CID 0694 FMI 07 is not still active.
Repair: Resume normal machine operation.
STOP
Test Step 6. CHECK THE PRESSURE OF THE PRIORITY VALVE.
- Check the pressure of the priority valve. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
Expected Result:
The pressure of the priority valve is correct.
Results:
- YES - The pressure of the priority valve is correct. Proceed to Test Step 8.
- NO - The pressure of the priority valve is not correct. Proceed to Test Step 7.
Test Step 7. RECHECK THE PRESSURE OF THE PRIORITY VALVE.
- Repair the cause of the incorrect priority valve pressure. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
- Operate the machine.
- Stop the machine and place the parking brake switch in the ON position.
- Determine if CID 0694 FMI 07 is present .
Expected Result:
CID 0694 FMI 07 is present.
Results:
- YES - CID 0694 FMI 07 is present. Proceed to Test Step 8.
- NO - CID 0694 FMI 07 is not present.
Repair: Resume normal machine operation.
STOP
Test Step 8. CHECK THE MODULATING VALVE.
- Check the modulating valve. If there is not a problem with the electrical wiring, the sensor, or the priority valve, check the modulating valve of the solenoid. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
Expected Result:
The modulating valve is correct.
Results:
- YES - The modulating valve is correct. Proceed to Test Step 10.
- NO - The modulating valve is not correct. Proceed to Test Step 9.
Test Step 9. RECHECK THE MODULATING VALVE.
- Repair the cause of the incorrect modulating valve. Refer to the Testing and Adjusting manual for the power train of the machine that is being serviced.
- Operate the machine.
- Stop the machine. Place the parking brake switch in the ON position.
- Determine if the CID 0694 FMI 07 is present.
Expected Result:
CID 0694 FMI 07 is still active.
Results:
- YES - CID 0694 FMI 07 is still active. Proceed to Test Step 10.
- NO - CID 0694 FMI 07 is not still active.
Repair: Resume normal machine operation.
STOP
Test Step 10. CHECK THE SOLENOID.
- Exchange the solenoid valve with a known good solenoid valve of a different clutch.
Expected Result:
The low pressure stays with the original clutch.
Results:
- YES - The low pressure stays with the original clutch. Proceed to Test Step 11.
- NO - Low pressure moves with the solenoid valve to the new clutch.
Repair: Replace the solenoid valve. Recalibrate the solenoid. See Testing and Adjusting, "Calibration".
STOP
Test Step 11. CHECK THE CURRENT OF THE SOLENOID.
- Turn the disconnect switch and the keyswitch to the ON position. DO NOT START THE ENGINE.
- Place the transmission in the gear that uses the solenoid valve.
- Place the parking brake in the OFF position.
- Measure the current to the solenoid valve.
Expected Result:
The current is at least 0.57 amperes.
Results:
- YES - The current is at least 0.57 amperes.
Repair: The current is correct. There may be a problem in the transmission.
STOP
- NO - The current is not at least 0.57 amperes.
Repair: Perform CID 0694 FMI 07 again. Exit this procedure and perform the diagnostic code procedure again. If the problem persists, the ECM may have failed. Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See the Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP