953C, 963C and 973C Track-Type Loaders Transmission Electronic Control System E283 Low Hydraulic Charge Pressure Caterpillar


E283 Low Hydraulic Charge Pressure
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Conditions Which Generate This Code:




Illustration 1g00418919

Schematic of the Solenoid Valve (Override)

This event code is recorded when the ECM has determined that the solenoid has not responded in the proper manner.

The possible causes of this event code are listed below:

  • The solenoid has failed in the low pressure position.

  • The charge relief valve setting is incorrect.

  • The pressure drop across the override solenoid is too large.

  • The machine harness has failed.

  • The ECM has failed. This is unlikely.

System Response:

When this event occurs, an alarm will sound and the machine speed will be reduced by 50%. The event will cause the transmission to shift to NEUTRAL. Limited operation at a reduced speed may be performed ONLY after you return the speed/direction control lever to the PARK position.

Note: Ensure that the E283 is on hold. The normal resistance of the coil at room temperature is 7.75 ohms. The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code is corrected.

Note: For additional troubleshooting of the hydraulic system, refer to Symptom 4 in Testing and Adjusting, RENR5226, "Troubleshooting".

Test Step 1. CHECK FOR DIAGNOSTIC CODES THAT ARE RELATED TO THE OVERRIDE SOLENOID.

  1. Turn the key start switch to the ON position.

  1. Check for diagnostic codes that are related to the solenoid.

    The related diagnostic codes are listed below:

    • CID 0133 FMI 03

    • CID 0133 FMI 05

    • CID 0133 FMI 06

    • CID 0133 FMI 12

Expected Result:

There are no other diagnostic codes that are related to the solenoid E283.

Results:

  • OK - There are no other diagnostic codes that are related to the solenoid E283. Proceed to Test Step 2.

  • NOT OK - There are diagnostic codes that are related to E283.

    Repair: Exit this procedure and perform the procedure for other related diagnostic codes.

    STOP

Test Step 2. CHECK THE CHARGE PRESSURE

  1. Turn the key start switch to the OFF position.

  1. Use a 3500 kPa (500 psi) gauge to verify that the charge pressure is set to 2850 ± 100 kPa (413 ± 14 psi).

    1. On the manifold, connect the 3500 kPa (500 psi) gauge to the "CHG" port.

    1. Turn ON the engine.

    1. Run the engine at high idle.

  1. Measure the charge pressure.

Expected Result:

The charge pressure is 2850 ± 100 kPa (413 ± 14 psi).

Results:

  • OK - The charge pressure is 2850 ± 100 kPa (413 ± 14 psi). Proceed to Test Step 3.

  • NOT OK - The charge pressure is not 2850 ± 100 kPa (413 ± 14 psi).

    Repair: Adjust the charge relief valve in order to set the charge pressure to 2850 ± 100 kPa (413 ± 14 psi).

    STOP

Test Step 3. CHECK THE PRESSURE SENSORS.

  1. Turn the key start switch to the "OFF" position.

  1. Disconnect the pressure gauge that was used in the previous Test Step.

  1. Turn the key start switch to the ON position.

  1. Check for diagnostic codes that are related to the pressure sensors.

    The diagnostic codes that are associated with the pressure sensors are listed below:

    • CID 0136 FMI 03

    • CID 0136 FMI 04

    • CID 0137 FMI 03

    • CID 0137 FMI 04

    • CID 0132 FMI 08

Expected Result:

There are no diagnostic codes that are related to the pressure sensors.

Results:

  • OK - There are no diagnostic codes that are related to the pressure sensors. Proceed to Test Step 4.

  • NOT OK - There are diagnostic codes that are related to the pressure sensors.

    Repair: Exit this procedure and perform the diagnostic procedure for the sensor with the active diagnostic code.

    STOP

Test Step 4. CHECK FOR HYDRAULIC CONTAMINATION AT THE SOLENOID.

  1. Turn the key start switch and the disconnect switch to the OFF position.

  1. Remove the solenoid (override) from the hydraulic circuit.

  1. Check the valve ports for contamination.

Expected Result:

There is no contamination.

Results:

  • OK - There is no contamination. Proceed to Test Step 5.

  • NOT OK - There is contamination. The contamination caused the solenoid to fail.

    Repair: Replace the solenoid and service the hydraulic system.

    STOP

Test Step 5. CHECK IF THE EVENT CODE REMAINS

  1. Connect the solenoid back to the machine.

  1. Turn the disconnect switch to the ON position.

  1. Start the machine.

  1. Operate the machine.

  1. Check if the E283 for the solenoid is active.

Expected Result:

The E283 for the solenoid is NOT active.

Results:

  • OK - The E283 for the solenoid is NOT active. The diagnostic code does not exist at this time. Resume normal operation.STOP

  • NOT OK - The E283 for the solenoid is active. The ECM has failed.

    Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the failure is not found, then replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

    STOP

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