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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - A-541E >> Diagnostic Tests >> DTC P0773: Lock-Up (SL) Solenoid Circuit >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure ignition is off. Access ECT ECU. See Figure. Backprobing ECT ECU harness connector with ohmmeter, measure resistance between terminal No. SL and ground. See Figure-Figure . If resistance is 8-100 k/ohms, replace ECT ECU and retest. If resistance is not within specification, go to next step.
  2. Disconnect solenoid harness connector (next to PNP switch) at transaxle. Check continuity between terminal SL of transaxle harness connector and corresponding terminal of ECT ECU harness connector. See Figure and Figure-Figure .
  3. If continuity does not exist, inspect and repair circuit as needed. If continuity exists, measure resistance between transaxle connector terminals SL and ground. See Figure. If resistance is 11-15 ohms, replace solenoid. If resistance is not as specified, replace transaxle sub-harness as needed.
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