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Code No.52: Damper Clutch System |
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OPERATION
The engine-A/T-ECU engages and disengages the damper clutch (incorporated in the torque converter) by operating the DCC solenoid valve in response to driving conditions.
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DIAGNOSIS CODE SET CONDITIONS
If the damper clutch solenoid valve drive duty ratio is 100%
for a continuous period of 4 seconds or more when the damper clutch starts operating, diagnosis code 52 is output.
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PROBABLE CAUSES
- Malfunction of input shaft speed sensor
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
- Malfunction of damper clutch solenoid valve
- Malfunction of valve body assembly
- Malfunction of torque converter
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STEP 1. MUT-II/III diagnosis code
If diagnosis code 52 is output, the input shaft speed sensor may be defective.
Q: Is diagnosis code 22 set?
YES:
Refer to diagnosis code 22: Input shaft speed sensor system  .
NO:
Go to Step 2  .
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STEP 2. MUT-II/III diagnosis code
If diagnosis code 52 is output, the damper clutch solenoid valve may be defective.
Q: Is diagnosis code 36 set?
YES:
Refer to diagnosis code 36: Damper clutch solenoid valve system .
NO:
Go to Step 3 .
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STEP 3. MUT-II/III data list - Item 36: Damper clutch solenoid valve duty ratio (Refer to data list reference table ).
- Item 52: Damper clutch slip amount (Refer to data list reference table ).
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Go to Step 4 .
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STEP 4. Hydraulic pressure test
Measure the torque converter hydraulic pressure (Refer to ).
OK: Refer to Hydraulic Pressure Test .
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Go to Step 5 .
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STEP 5. Adjust the line pressure and recheck the diagnosis code. - Adjust the line pressure (Refer to ).
- Test drive the vehicle.
- Check the diagnosis code.
Q: Is the diagnosis code set?
YES:
Go to Step 7 .
NO:
The inspection is complete.
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STEP 6. Replace the engine-A/T-ECU and then recheck the diagnosis code. - Replace the engine-A/T-ECU.
- Test drive the vehicle.
- Check the diagnosis code.
Q: Is the diagnosis code set?
YES:
Go to Step 7 .
NO:
The inspection is complete.
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STEP 7. Disassemble, clean and assemble the valve body and recheck the diagnosis code. - Check the mounting bolts for looseness, and the O-ring, solenoid valve and valve body for damage.
Replace the valve body assembly if the damages are thought to be irreparable.
- Test drive the vehicle.
- Check the diagnosis code.
Q: Is the diagnosis code set?
YES:
Check the torque converter and replace it if necessary.
NO:
The inspection is complete.
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