Inspection Procedure

HINT:

• When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc., DTC P505 will possibly be detected.
• 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, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Hand-held tester: 

1. CHECK OTHER DTC OUTPUT 
   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. Read the DTCs.

      Result: 

      RESULT REFERENCE
      
      

      Display (DTC output)	Proceed to
      P0505	A
      P0511 and other DTCs	B

   • B : Go to step   7 
   • A : Go to next Step 
2. CHECK CONNECTION OF PCV HOSE 
   • NG : REPAIR OR REPLACE PCV HOSE 
   • OK : Go to next step 
3. CHECK AIR INDUCTION SYSTEM 
   • NG : REPAIR OR REPLACE 
   • OK : Go to next step 
4. PERFORM ACTIVE TEST USING HAND-HELD TESTER (CHECK IAC VALVE OPERATION) 
   1. Warm up the engine to the normal operating temperature.
   2. Switch off all the accessories.
   3. Switch off the A/C.
   4. Shift the lever into the neutral position.
   5. Connect the hand-held tester to the DLC3.
   6. Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / ISC DUTY RATIO".
   7. Check that the engine RPM varies when changing the ISC duty ratio.

      Engine RPM: 

      Engine RPM fluctuates up and down in response to the ISC duty ratio variation. 

   • OK : CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
   • NG : GO TO NEXT STEP 
5. CHECK A/C SIGNAL CIRCUIT 
   • NG : REPAIR OR REPLACE 
   • OK : Go to next step 
6. CHECK BLOCKAGE OF IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE 
   • NG : REPLACE IDLE AIR CONTROL VALVE 
   • OK : Go to next step 
7. CHECK HARNESS AND CONNECTOR 
   1. Disconnect the I1 IAC valve connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between the terminals of the IAC valve wire harness side connector.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      VISC (I1-2) - GND (I1-3)	9 to 14 V

   4. Reconnect the IAC valve connector.
   Fig 1: Identifying L1 ISC Valve Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK : Go to next step 
8. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) 
   1. Disconnect the I1 IAC valve connector.
   2. Disconnect the E3 ECM connector.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      DUTY (I1-1) - RSO (E3-5)	Below 1 Ω
      GND (I1-3) - E01 (E3-7)

      Fig 2: Identifying E3 ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      DUTY (I1-1) or RSO (E3-5) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the IAC valve connector.
   Fig 3: Identifying L1 ISC Valve Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK : Go to next step 
9. INSPECT IDLE AIR CONTROL VALVE (See  ON-VEHICLE INSPECTION  ) 
   • NG : REPLACE IDLE AIR CONTROL VALVE 
   • OK : REPLACE ECM (See  REPLACEMENT  ) 

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

1. CHECK OTHER DTC OUTPUT 
   1. Connect the hand-held tester to the DLC3.

      Result: 

      RESULT REFERENCE
      
      

      Display (DTC output)	Proceed to
      P0505	A
      "P0511" and other DTCs	B

   • B : Go to step   6 
   • A : Go to next Step 
2. CHECK CONNECTION OF PCV HOSE 
   • NG : REPAIR OR REPLACE PCV HOSE 
   • OK : Go to next step 
3. CHECK AIR INDUCTION SYSTEM 
   • NG : REPAIR OR REPLACE 
   • OK : Go to next step 
4. CHECK A/C SIGNAL CIRCUIT 
   • NG : REPAIR OR REPLACE 
   • OK : Go to next step 
5. CHECK BLOCKAGE OF IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE 
   • NG : REPAIR OR REPLACE IDLE AIR CONTROL VALVE 
   • OK : Go to next step 
6. CHECK HARNESS AND CONNECTOR 
   1. Disconnect the I1 IAC valve connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between the terminals of the IAC valve wire harness side connector.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      VISC (I1-2) - GND (I1-3)	9 to 14 V

   4. Reconnect the IAC valve connector.
   Fig 4: Identifying L1 ISC Valve Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK: Go to next step 
7. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) 
   1. Disconnect the I1 IAC valve connector.
   2. Disconnect the E3 ECM connector.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      DUTY (I1-1) - RSO (E3-5)	Below 1 Ω
      GND (I1-3) - E01 (E3-7)

      Fig 5: Identifying E3 ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      DUTY (I1-1) or RSO (E3-5) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the IAC valve connector.
   Fig 6: Identifying L1 ISC Valve Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK : Go to next step 
8. INSPECT IDLE AIR CONTROL VALVE (See  ON-VEHICLE INSPECTION  ) 
   • NG : REPAIR OR REPLACE IDLE AIR CONTROL VALVE 
   • OK : REPLACE ECM (See  REPLACEMENT  )