DTC P0403: Exhaust Gas Recirculation Control Circuit: 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. Refer to INSPECTION MODE PROCEDURE .
5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more.

   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.
7. Confirm the Throttle Idle Position is ON and check the engine idling condition and 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 Active Test is completed.

   OK

   MAP and idling condition change in response to EGR step position as follows.

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   Idling condition	Steady idling	Idling changes from steady to rough idling or engine stall
   MAP (Data List)	20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed)	MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

   HINT: 

   During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in EGR valve.

   Result

   Result	Proceed to
   Within standard range	A
   Outside standard range	B

B → See step   2 

A → See step   5 

Fig 1: EGR Valve Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (+B1) - 1 (EGR4)	20°C (68°F)	18 to 22 Ω
   2 (+B1) - 3 (EGR2)	20°C (68°F)	18 to 22 Ω
   5 (+B2) - 4 (EGR1)	20°C (68°F)	18 to 22 Ω
   5 (+B2) - 6 (EGR3)	20°C (68°F)	18 to 22 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (EGR Valve Assembly)

3. Reconnect the EGR valve assembly connector.

NG → See step   6 

OK: Go to next step 

Fig 2: EGR Valve Assembly Connector

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
   D51-2 (+B1) - Body ground	Power switch on (IG)	11 to 14 V
   D51-5 (+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)

4. Reconnect the EGR valve assembly connector.

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
   D1-14 (EGR1) - D51-4 (EGR1)	Always	Below 1 Ω
   D1-13 (EGR2) - D51-3 (EGR2)	Always	Below 1 Ω
   D1-12 (EGR3) - D51-6 (EGR3)	Always	Below 1 Ω
   D1-15 (EGR4) - D51-1 (EGR4)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D1-14 (EGR1) or D51-4 (EGR1) - Body ground	Always	10 kΩ or higher
   D1-13 (EGR2) or D51-3 (EGR2) - Body ground	Always	10 kΩ or higher
   D1-12 (EGR3) or D51-6 (EGR3) - Body ground	Always	10 kΩ or higher
   D1-15 (EGR4) or D51-1 (EGR4) - Body ground	Always	10 kΩ or higher

4. Reconnect the EGR valve assembly connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EGR VALVE ASSEMBLY) 

OK → See step   7