Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester or OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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, and other data from the time the malfunction occurred.

When using intelligent tester

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) 
   1. Connect an intelligent tester to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the tester ON.
   4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   5. Read DTCs.

      Result 

      ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
      
      

      Display (DTC Output)	Proceed To
      P2121	A
      P2121 and other DTCs	B

      HINT:

      If any DTCs other than P2121 are output, troubleshoot those DTCs first.

   B: GO TO  DIAGNOSTIC TROUBLE CODE CHART  

   A: GO TO NEXT STEP 

2. READ VALUE USING INTELLIGENT TESTER (ACCEL POS #1 AND ACCEL POS #2) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to ON and turn the tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2.
   4. Read the values displayed on the tester.

      Standard voltage 

      ACCEL POS #1 AND ACCEL POS #2
      
      

      Accelerator Pedal Operations	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 5.0 V

      Fig 1: Depressing And Releasing Accelerator Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: GO TO NEXT STEP 

3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to ON and turn the tester ON.
   3. Clear DTCs (See DTC CHECK/CLEAR  ).
   4. Start the engine.
   5. Allow the engine to idle for 15 seconds.
   6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   7. Read DTCs.

      Result 

      WHETHER DTC OUTPUT RECURS (DTC P2121)
      
      

      Display (DTC Output)	Proceed To
      P2121	A
      P2121 and other DTCs	B

   B: SYSTEM OK 

   A: REPLACE ECM 

When not using intelligent tester 

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) 
   1. Read DTCs.

      Result 

      ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
      
      

      Display (DTC Output)	Proceed To
      P2121	A
      No output	B

      HINT:

      If any DTCs other than P2121 are output, troubleshoot those DTCs first.

   B: GO TO  DIAGNOSTIC TROUBLE CODE CHART  

   A: GO TO NEXT STEP 

2. INSPECT ECM (VPA AND VPA2 VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Measure the voltage between the terminals of the E4 ECM connector.

      Standard voltage 

      ECM (VPA AND VPA2 VOLTAGE)
      
      

      Accelerator Pedal Operations	Tester Connections E4-22 (VPA) - E4-28 (EPA)	Tester Connections E4-23 (VPA2) - E4-29 (EPA2)
      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 2: Inspecting ECM (VPA And VPA2 Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: GO TO NEXT STEP 

3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
4. CHECK WHETHER DTC OUTPUT RECURS 
   1. Clear DTCs (See DTC CHECK/CLEAR  ).
   2. Start the engine.
   3. Allow the engine to idle for 15 seconds.
   4. Read DTCs.

      Result 

      WHETHER DTC OUTPUT RECURS
      
      

      Display (DTC Output)	Proceed To
      P2121	A
      No output	B

   B: SYSTEM OK 

   A: REPLACE ECM