Code No.P1787 (P0742) Damper clutch system (stuck on)
OPERATION
Refer to 
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DIAGNOSIS CODE SET CONDITIONS
If the damper clutch control remains engaged for a continuous period of ten seconds or more when the ECU is attempting to disengage the damper clutch control, diagnosis code No.P1787 (P0742) is set.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
- Malfunction of damper clutch solenoid valve
- Malfunction of valve body assembly
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STEP 1. M.U.T.-III diagnosis code
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If diagnosis code P1787 (P0742) is set, the damper clutch solenoid valve may be defective.
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Q.
Is diagnosis code P1778 (P0743) set?
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 Refer to diagnosis code P1778 (P0743): Damper clutch solenoid valve system .
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 Go to Step 2.
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STEP 2. M.U.T.-III data list
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Item 10: Damper clutch slip amount (Refer to data list reference table ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Go to Step 3.
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STEP 3. Replace the A/T-ECU <4M4> or engine-A/T-ECU <6G7> and then recheck the diagnosis code.
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(1)Replace the A/T-ECU <4M4> or engine-A/T-ECU <6G7>.
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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 4.
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The inspection is complete.
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STEP 4. 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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