Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check transmission wire.
PREPARATION:

Disconnect the transmission wire connector.

CHECK:

Measure resistance between S1, S2 or S 3 of transmission wire and body ground.

OK:

Resistance: 11 - 15 Ω at 20 °C (68 °F)
1. NG : Go to step 3 .
  
  Fig 1: Measuring Resistance Between S1, S2 Or S 3 Of Transmission Wire And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. OK : Go to next step.
Measure resistance between terminal S1, S2 or S3 of ECM and body ground.
PREPARATION:
1. Connect the transmission wire connector.
2. Remove the ECM hood.
3. Disconnect the connector from ECM.
  CHECK:
  
  Measure resistance between terminal S1, S2 or S 3 and E1 of ECM.
  
  OK:
  
  Resistance: 11 - 15 Ω at 20 °C (68 °F)
  
  Fig 2: Measuring Resistance Between Terminal S1, S2 Or S 3 And E1 Of ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Check and replace the ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. NG : Repair or replace the harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
Check shift solenoid valve No. 1, No. 2 or No. 3.
PREPARATION:
1. Remove the oil pan.
2. Remove the shift solenoid valve No. 1, No. 2 or No. 3.
CHECK:
1. Measure resistance between solenoid connector and body ground.
2. Connect positive (+) lead to terminal of solenoid connector, negative (-) lead to solenoid body.
  OK:
  1. (a) Resistance: 11 - 15 Ω at 20 °C (68 °F)
  2. (b) The solenoid makes an operating noise.
    
    Fig 3: Checking Shift Solenoid Valve No. 1, No. 2 Or No. 3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace the shift solenoid valve (See VALVE BODY ASSEMBLY ).
2. OK : Repair or replace the transmission wire (See ATF TEMPERATURE SENSOR ).