Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure ignition is in the OFF position. Access the ECM. See Figure. Disconnect the ECM 31-pin connector E4 and 17-pin connector E6. Using DVOM, measure the resistance between ground and the ECM harness connector E4 terminal No. 7 (shift solenoid No. 1). Also, measure the resistance between ground and the ECM harness connector E6 terminal No. 1 (shift solenoid No. 2). See Figure. If either resistance is not 11-15 ohms, go to next step. If both resistances are 11-15 ohms, replace ECM and retest.
- Disconnect the transaxle harness 6-pin connector E1 (next to PNP switch). Using DVOM, measure the resistance of Pink wire between the ECM harness connector E4 terminal No. 7 and transaxle harness connector E1 terminal No. 3. Also, measure the resistance of Green/Yellow wire between the ECM harness connector E6 terminal No. 8 and transaxle harness connector E1 terminal No. 6. See Fig 1 and Figure . If resistance is zero ohms, go to next step. If resistance is more than zero ohms, repair open in affected circuit between transaxle and ECM. See WIRING DIAGRAMS .
- Remove the suspect shift solenoid. Using DVOM, measure the resistance between the shift solenoid connector terminal and solenoid case. If resistance is 11-15 ohms, check and repair internal transaxle harness for open circuit. See WIRING DIAGRAMS . If resistance is not 11-15 ohms, replace the faulty shift solenoid.