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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start and warm the engine to normal operating temperature. Turn the ignition switch to the OFF position. Connect the scan tool to the DLC3. Turn the ignition switch to the ON position and turn the scan tool ON. Select the item "LINE PRESS UP" in the ACTIVE TEST and operate the shift solenoid SLT on the scan tool. If line pressure can be raised, replace the ECM. If the line pressure cannot be raised, go to next step.
  2. Disconnect the transaxle wiring harness from the transaxle. Measure the resistance between the terminal SLT+ and SLT-. See Figure. Resistance should be between 5.0-5.6 ohms, at 68°F (20°C). If readings are within specifications, go to next step. If not, go to step  4.
  3. Connect the transaxle wiring harness to the transaxle. Disconnect the ECM connector. Measure the resistance between terminals SLT+ and SLT- of ECM connector. See Figure. Resistance should be between 5.0-5.6 ohms, at 68°F (20°C). If readings are within specifications, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If not, go to next step.
  4. Raise and support the vehicle. Remove the oil pan. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Disconnect the solenoid connector. Measure the solenoid resistance between terminals No. 1 and 2 of the solenoid connector. Resistance should be between 5.0-5.6 ohms at 68°F (20°C).

    Connect battery voltage, with a 21-watt bulb, to terminal No. 1 of the solenoid connector and ground terminal No. 2, then check the movement of the valve. When battery voltage is applied, valve should move out of solenoid. See Figure. When battery positive voltage is removed, valve should move back in. If both checks operated as described, replace transaxle wiring harness and connector. If both checks did not operate as described, replace pressure control solenoid (SLT) valve.

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