Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Hand-held tester: 

1. Connect hand-held tester, and read the voltage for accelerator pedal position sensor data. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Enter the following menus: DIAGNOSTICS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2.

   CHECK: 

   Read the voltage for the accelerator pedal position sensor data.

   OK: 

   Accelerator Pedal Position Sensor Voltage data Table
   
   

   Accelerator pedal	ACCEL POS #1	ACCEL POS #2
   Released	0.5 to 1.1 V	1.2 to 2.0 V
   Depressed	2.6 to 4.5 V	3.4 to 5.3 V

   Fig 1: Locating Accelerator Pedal Depressed and Released Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Replace ECM (See  INSPECTION  ). 
   2. NG: Go to Next Step 
2. Check for open and short in harness and connector between accelerator pedal position sensor and ECM. 

   PREPARATION: 

   1. Disconnect the A14 accelerator pedal position sensor connector.
   2. Disconnect the E9 ECM connector.

   CHECK: 

   Measure the resistance between the wire harness side connectors.

   OK: 

   1. Standard (Check for open): 
      Measuring resistance in Tester Connection (check for open)
      
      

      Tester Connection	Specified Condition
      VPA1 (A14-5) - VPA (E9-22)	Below 1 Ω
      EP1 (A14-3) - EPA (E9-28)	Below 1 Ω
      VCP1 (A14-6) - VCPA (E9-26)	Below 1 Ω
      VPA2 (A14-2) - VPA2 (E9-23)	Below 1 Ω
      EP2 (A14-1) - EPA2 (E9-29)	Below 1 Ω
      VCP2 (A14-4) - VCP2 (E9-27)	Below 1 Ω

      Fig 2: Identifying A14 accelerator Pedal Position Sensor Connector terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Standard (Check for short): 
      [Measuring resistance in Tester Connection (check for Short)]
      
      

      Tester Connection	Specified Condition
      VPA1 (A14-5) or VPA (E9-22) - Body ground	10 kΩ or higher
      EP1 (A14-3) or EPA (E9-28) - Body ground	10 kΩ or higher
      VCP1 (A14-6) or VCPA (E9-26) - Body ground	10 kΩ or higher
      VPA2 (A14-2) or VPA2 (E9-23) - Body ground	10 kΩ or higher
      EP2 (A14-1) or EPA2 (E9-29) - Body ground	10 kΩ or higher
      VCP2 (A14-4) or VCP2 (E9-27) - Body ground	10 kΩ or higher

      Fig 3: Disconnecting E9 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Repair or replace harness or connector. 
   2. OK: Replace accelerator pedal assembly. See  ACCELERATOR PEDAL POSITION SENSOR  . 

OBD II scan tool (excluding hand-held tester): 

1. Check voltage between terminals VPA and EPA, VPA2 and EPA2 of ECM connector. 

   PREPARATION: 

   Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between the specified terminals of the E9 ECM connector.

   OK: 

   Fig 4: Identifying E9 ECM Connector terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 5: Accelerator Pedal Position sensor Voltage Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Replace ECM (See  INSPECTION  ). 
   2. NG: Go to Next Step 
2. Check for open and short in harness and connector between accelerator pedal position sensor and ECM. 

   PREPARATION: 

   1. Turn the ignition switch ON.
   2. Disconnect the A14 accelerator pedal position sensor connector.

   CHECK: 

   Measure the voltage between the specified terminals of the E9 ECM connector.

   OK: 

   Tester Connection Specified Condition Table
   
   

   Tester Connection	Specified Condition
   VCPA (E9-26) - EPA (E9-28)	4.5 to 5.5 V
   VCP2 (E9-27) - EPA2 (E9-29)	4.5 to 5.5 V

   Fig 6: Disconnecting A14 Accelerator Pedal Position Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace ECM (See  INSPECTION  ). 
   2. OK: Replace accelerator pedal assembly. See  ACCELERATOR PEDAL POSITION SENSOR  .