Hand-held tester:

READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2)
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to ON.
3. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS #1 and ACCEL POS #2. Read the values.
  Standard:
  
  Fig 1: Accelerator Pedal Position And Voltage Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Depressing And Releasing Accelerator Pedal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to step 5

NG: GO TO NEXT STEP.
INSPECT ACCELERATOR PEDAL ASSY (ACCELERATOR PEDAL POSITION SENSOR)
1. Disconnect the A25 accelerator pedal position sensor connector.
2. Measure the resistance between each terminal.
  Standard:
  
  Fig 3: Accelerator Pedal Position Sensor Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the accelerator pedal position sensor connector.
  
  Fig 4: Identifying Accelerator Pedal Position Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE ACCELERATOR PEDAL ASSY (See ACCELERATOR PEDAL ASSY (3MZ-FE (NORMAL PEDAL) )

OK: GO TO NEXT STEP.
INSPECT ECM (VPA AND VPA2 VOLTAGE)
1. Turn the ignition switch to ON.
2. Measure the voltage between the specified terminals of the E6 ECM connector.
  Standard:
  
  Fig 5: ECM Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ECM (See ECM (3MZ-FE) )

NG: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)
1. Disconnect the A25 accelerator pedal position sensor connector.
2. Disconnect E6 the ECM connector.
3. Check the resistance between the wire harness side connectors.
  Standard: (Check for open)
  
  Fig 7: Accelerator Pedal Position Sensor And ECM Terminals Specified Condition Chart (Check For Open)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  (Check for short)
  
  Fig 8: Accelerator Pedal Position Sensor And ECM Terminals Specified Condition Chart (Check For Short)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the accelerator pedal position sensor connector.
5. Reconnect the ECM connector.
  
  Fig 9: Identifying Accelerator Pedal Position Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 10: Connecting E6 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.
REPLACE ACCELERATOR PEDAL ASSY (See ACCELERATOR PEDAL ASSY (3MZ-FE (NORMAL PEDAL) ).
GO: GO TO NEXT STEP.
READ OUTPUT DTC (SEE IF ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN)
1. Clear the DTC (see DTC CHECK/CLEAR ).
2. Start the engine.
3. Run the engine at idle for 15 seconds or more.
4. Read the DTC (see DTC CHECK/CLEAR ).
  Result:
  
  Fig 11: DTC Output Result Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
B: SYSTEM OK

A: GO TO NEXT STEP.

REPLACE ECM (See ECM (3MZ-FE) )