DTC P0403: Exhaust Gas Recirculation Control Circuit [08/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [08/2014 - ] .
5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   HINT: 

   The A/C switch and all accessory switches should be off.

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Throttle Idle Position and MAP.
7. Check that the Throttle Idle Position in ON and check the MAP values in the Data List while performing the Active Test.

   HINT: 

   • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
   • Be sure to return the EGR valve to step 0 when the Active Test is completed.
   • Do not open the EGR valve 30 steps or more during the Active Test.

   OK

   MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   MAP (Data List)	(EGR valve is fully closed)	MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

   HINT: 

   • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

   Result

   Result	Proceed to
   Within standard range	A
   Outside of standard range	B

B → See step   2 

A → See step   5 

1. Inspect the EGR valve assembly. Refer to INSPECTION [08/2014 - ] .

   HINT: 

   Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to INITIALIZATION [08/2014 - ] .

NG → See step   6 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the EGR valve assembly connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D10-2 (+B1) - Body ground	Power switch on (IG)	11 to 14 V
   D10-5 (+B2) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to EGR Valve Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY) 

OK: Go to next step 

1. Disconnect the EGR valve assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D28-45 (EGR1) - D10-4 (EGR1)	Always	Below 1 Ω
   D28-44 (EGR2) - D10-3 (EGR2)	Always	Below 1 Ω
   D28-43 (EGR3) - D10-6 (EGR3)	Always	Below 1 Ω
   D28-42 (EGR4) - D10-1 (EGR4)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D28-45 (EGR1) or D10-4 (EGR1) - Body ground	Always	10 kΩ or higher
   D28-44 (EGR2) or D10-3 (EGR2) - Body ground	Always	10 kΩ or higher
   D28-43 (EGR3) or D10-6 (EGR3) - Body ground	Always	10 kΩ or higher
   D28-42 (EGR4) or D10-1 (EGR4) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7