Code No.52: Damper clutch system
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.
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 set.
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. M.U.T.-III diagnosis code
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If diagnosis code 52 is set, the input shaft speed sensor may be defective.
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Q.
Is diagnosis code 22 set?
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 Refer to diagnosis code 22: Input shaft speed sensor system  .
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 Go to Step 2.
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STEP 2. M.U.T.-III diagnosis code
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If diagnosis code 52 is set, the damper clutch solenoid valve may be defective.
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Q.
Is diagnosis code 36 set?
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Refer to diagnosis code 36: Damper clutch solenoid valve system .
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Go to Step 3.
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STEP 3. M.U.T.-III data list
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- 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 ).
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 4.
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STEP 4. Hydraulic pressure test
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Measure the torque converter hydraulic pressure (Refer to ).
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OK: Refer to Hydraulic Pressure Test .
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Adjust the line pressure and recheck the diagnosis code.
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(1)Adjust the line pressure (Refer to ).
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(2)Test drive the vehicle.
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(3)Check the diagnosis code.
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Q.
Is the diagnosis code set?
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Go to Step 7.
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The inspection is complete.
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STEP 6. Replace the engine-A/T-ECU and then recheck the diagnosis code.
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(1)Replace the engine-A/T-ECU.
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(2)Test drive the vehicle.
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(3)Check the diagnosis code.
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Q.
Is the diagnosis code set?
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Go to Step 7.
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The inspection is complete.
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STEP 7. Disassemble, clean and assemble the valve body and recheck the diagnosis code.
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(1)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.
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(2)Test drive the vehicle.
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(3)Check the diagnosis code.
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Q.
Is the diagnosis code set?
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Check the torque converter and replace it if necessary.
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The inspection is complete.
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