DTC P0505: Idle Control System Malfunction [08/2015 - 10/2016]: Procedure

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read DTCs.

RESULT

Result	Proceed to
P0505 is output	A
P0505 and other DTCs are output	B

HINT:

If any DTCs other than P0505 are output, troubleshoot those DTCs first.

Result:

GO TO DTC CHART

(Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 10/2016] )

Result:

See step 2

CHECK PCV HOSE CONNECTIONS
1. Check the PCV hose connections (Refer to PROCEDURE - Step 2 ).
  OK
  
  PCV hose is connected correctly and is not damaged.
Result:

NG

REPAIR OR REPLACE PCV HOSE

(Refer to REMOVAL [08/2015 - 08/2018] )

Result:

OK

See step 3
CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leakage (Refer to PROCEDURE - Step 4 ).
  OK
  
  No leakage from air induction system.
  
  HINT:
  
  Perform "Inspection After Repair" after repairing or replacing the air induction system (Refer to INITIALIZATION [08/2015 - 08/2017] ).
Result:

NG

REPAIR OR REPLACE AIR INDUCTION SYSTEM

(Refer to REMOVAL [08/2015 - 08/2018] )

Result:

OK

See step 4
CHECK THROTTLE VALVE
1. Check the throttle valve condition.
  OK
  
  Throttle valve is not contaminated with foreign objects and moves smoothly.
  
  HINT:
  
  Perform "Inspection After Repair" after replacing the throttle body assembly (Refer to INITIALIZATION [08/2015 - 08/2017] ).
Result:

OK

REPLACE ECM

(Refer to REMOVAL [08/2015 - 08/2018] )

Result:

NG

REPLACE THROTTLE BODY ASSEMBLY

(Refer to REMOVAL [08/2015 - 08/2018] )