Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

Warm up the engine.
Turn the ignition switch off.
Connect the OBD II scan tool or hand-held tester to the DLC3.
Turn the ignition switch to the ON position.
Push the "ON" button of the OBD II scan tool or the hand-held tester.
When you use hand-held tester:
Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
According to the display on tester, read the "DATA LIST".

Fig 1: Identifying Measurement Item Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.

SPD (NC) is always more than 0 and less than 300 RPM while driving the vehicle at 50 km/h (31 mph) or more:

Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

INSPECT SPEED SENSOR INSTALLATION
1. Check the speed sensor installation.
  Standard:
  
  The installation bolt is tightened properly and there is no clearance between the sensor and transaxle case.
  
  Fig 2: Identifying Clearance Between Sensor And Transaxle Case
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE SPEED SENSOR (NC)

OK: Go to next step.
INSPECT SPEED SENSOR (NC)
1. Disconnect the speed sensor connector from the transaxle.
2. Measure the resistance according to the value(s) in the figure Fig 3 below.
  Standard
  
  Fig 3: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE SPEED SENSOR (NC)

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (SPEED SENSOR - ECM)
1. Connect the speed sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the figure Fig 5 below.
  Standard
  
  Fig 5: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the resistance according to the value(s) in the figure Fig 7 below.
  Standard (Check for short)
  
  Fig 7: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

OK: REPLACE ECM (SEE ECM (3MZ-FE) )