Description:

This error code, EPC 524230.04, is generated when the enable pressure sensor measures less than 150 kPa (1.5 bar; 22 psi) within 2 seconds after starting the engine, although the proportional solenoid valve (Y38) for transmission enable was activated. Additionally, it occurs when in come home mode or with the clutch pedal switch closed (clutch pedal not depressed), the commanded pressure is the system pressure, and the enable pressure sensor measures a pressure of less than 150 kPa. This indicates a circuit problem at the enable pressure sensor (B105) or a defective proportional solenoid valve for transmission enable (valve stuck closed).

Reaction:

When this error is detected, the transmission may not engage as expected, potentially leading to issues with vehicle movement and transmission operation.

Recommendations:

Inspect Proportional Solenoid Valve (Y38):

• Check the condition and functionality of the proportional solenoid valve for transmission enable. Ensure that it is not stuck in the closed position. Replace the valve if necessary.

Test Enable Pressure Sensor (B105):

• Use diagnostic tools to test the enable pressure sensor. Ensure it is accurately measuring the pressure and is not providing false readings.

Inspect Wiring and Connections:

• Inspect the wiring and connections to both the solenoid valve (Y38) and the enable pressure sensor (B105) for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.

Verify Pressure Readings:

• Measure the pressure readings manually to ensure they match the sensor outputs. Confirm that the sensor and valve operate within the specified pressure ranges.

Reset and Test System:

• After addressing the issues, reset the system and test the transmission enable functionality to ensure it operates correctly and that the error code does not reoccur.

Note:

Proper functionality of the solenoid valve and pressure sensor is essential for reliable transmission engagement. Regular inspections help prevent issues related to stuck valves and inaccurate pressure readings.