Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK SPEEDOMETER 
   1. Drive the vehicle and check whether the operation of the speedometer in the combination meter is normal.

      HINT:

      • The vehicle speed sensor is operating normally if the speedometer reading is normal.
      • If the speedometer does not operate, check it by following the procedure described in speedometer malfunction.

   NG:  Go to SPEEDOMETER MALFUNCTION

   OK: Go to next step 

2. READ VALUE OF INTELLIGENT TESTER (VEHICLE SPEED) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the tester on.
   4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / VEHICLE SPD.
   5. Drive the vehicle.
   6. Read the value displayed on the tester.

      OK: 

      Vehicle speeds displayed on tester and speedometer display are equal. 

   NG: CHECK FOR INTERMITTENT PROBLEMS 

   OK: Go to next step 

3. CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE) 
   1. Disconnect the C10 combination meter connector.
   2. Turn the ignition switch to the ON position.
   3. Measure the voltage between the terminal of the combination meter and body ground.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Tester Connection	Specified Condition
      C10-36 - Body ground	4.5 to 5.5 V

   4. Reconnect the combination meter connector.

   NG:  Go to step  5

   Fig 1: Disconnecting C10 Combination Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

4. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM) 
   1. Shift the transmission gear selector lever to the neutral position.
   2. Jack up the vehicle.
   3. Turn the ignition switch to the ON position.
      Fig 2: Identifying Combination Meter Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Measure the voltage between the terminal of the combination meter and body ground while the wheel is turned slowly.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Tester Connection	Specified Condition
      C10-36 - Body ground	Voltage generated intermittently

      HINT:

      The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

      Fig 3: Combination Meter Assembly Connector Voltage Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE COMBINATION METER ASSEMBLY 

   OK: Go to next step 

5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) 
   1. Disconnect the C10 combination meter connector.
   2. Disconnect the E5 ECM connector.
      Fig 4: Disconnecting E5 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Measure the resistance.

      Standard resistance (Check for open) 

      STANDARD RESISTANCE SPECIFICATIONS FOR OPEN
      
      

      Tester Connection	Specified Condition
      C10-36 - SPD (E5-8)	Below 1 Ω

      Standard resistance (Check for short) 

      STANDARD RESISTANCE SPECIFICATIONS FOR SHORT
      
      

      Tester Connection	Specified Condition
      C10-36 or SPD (E5-8) - Body ground	10 kΩ or higher

   4. Reconnect the combination meter connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ASSEMBLY - ECM) 

   OK: REPLACE ECM  (See REMOVAL )