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 SLN+ and SLN- of transmission wire.

OK:

Resistance: 5.0 - 5.6 Ω at 20 °C (68°F)

CHECK:

Measure resistance between terminals SLN⁺ and SLN^- of the transmission wire connector and body ground.

Fig 1: Measuring Resistance Between Terminals SLN
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Resistance: 1 MΩ or higher
1. NG : Go to step 3 .
2. OK : Go to next step.
Measure resistance between terminals SLN ⁺ and SLN ^- of ECM connector.
PREPARATION:
1. Connect the transmission wire connector.
2. Remove the ECM hood.
3. Disconnect the connector of the ECM.
CHECK:

Measure resistance between terminals SLN⁺ and SLN^- of ECM connector.

OK:

Resistance: 5.0 - 5.6 Ω at 20 °C (68°F)

CHECK:

Fig 2: Measuring Resistance Between Terminals SLN
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure resistance between terminals SLN⁺ and SLN^- of the ECM connector and body ground.

OK:

Resistance: 1 MΩ. or higher
1. NG : Repair or replace the harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Check and replace the ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
Check shift solenoid valve SLN.
PREPARATION:
1. Jack up the vehicle.
2. Remove the oil pan.
3. Disconnect the solenoid connector.
  Check solenoid resistance:
  
  CHECK:
  
  Measure resistance between terminals 1 and 2 of solenoid connector.
  
  OK:
  
  Resistance: 5.0 - 5.6 Ω at 20 °C (68 °F)
  
  Check solenoid operation:
  
  CHECK:
  
  Connect positive (+) lead with an 8 ~ 10 W bulb to terminal 1 of solenoid connector and negative (-) lead to terminal 2, then check the movement of the valve.
  
  OK:
  
  Fig 3: Locating Valves Moves Arrow
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Measuring Resistance Between Terminals 1 And 2 Of Solenoid Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace the shift solenoid valve SLN (See VALVE BODY ASSEMBLY ).
2. OK : Repair or replace the transmission wire (See ATF TEMPERATURE SENSOR ).