DTC    P0403    Exhaust Gas Recirculation Control Circuit

for Preparation Click here

DESCRIPTION

HINT:

DTC P0403 is set when the power switch is on (IG).

MONITOR DESCRIPTION

1. If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, but the step motor is still operating, the ECM determines that there is a short in the EGR valve assembly circuit , and sets the DTC.
   
2. If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, and the step motor is not operating, the ECM determines that there is an open in the EGR valve assembly circuit, and sets the DTC.
   

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.
   
2. Turn the power switch on (IG) and turn the tester on.
   
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
   
4. Turn the power switch off and wait for 30 seconds.
   
5. Turn the power switch on (IG) and turn the tester on [A].
   
6. Put the engine in inspection mode (maintenance mode) (Click here).
   
7. Start the engine and warm it up [B].
   
8. Drive the vehicle at 20 km/h (12.4 mph) or more for 10 minutes [C].
   

   CAUTION:

   When performing the confirmation driving pattern, obey all speed limits and traffic laws.

9. Enter the following menus: Powertrain / Engine and ECT / DTC [D].
   
10. Read the pending DTCs.
    

    HINT:

    1. If a pending DTC is output, the system is malfunctioning.
       
    2. If a pending DTC is not output, perform the following procedure.
       

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    
12. Input the DTC: P0403.
    
13. Check the DTC judgment result.
    
    

    Tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:

    1. If the judgment result shows NORMAL, the system has a normal.
       
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
       

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Read freeze frame data using the intelligent tester. 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 moving or stationary, 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.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the power switch on (IG).
   

3. Turn the tester on.
   

4. Put the engine in inspection mode (maintenance mode) (Click here).
   

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 / Data List / All Data / Throttle Idle Position and MAP.
   

7. Confirm that 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:

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

   OK:

   MAP and idling condition 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
   Idling condition	Steady idling	Idling changes from steady to rough idling or stalls
   MAP (Data List)	MAP value is 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

   Result 

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

B	Go to step 2

A
CHECK FOR INTERMITTENT PROBLEMS (Click here)

1. Inspect the EGR valve assembly (Click here).
   

NG	REPLACE EGR VALVE ASSEMBLY (Click here)

OK

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

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:

   
   

   Tester Connection	Condition	Specified Condition
   D27-45 (EGR1) - D10-4 (EGR1)	Always	Below 1 Ω
   D27-44 (EGR2) - D10-3 (EGR2)	Always	Below 1 Ω
   D27-43 (EGR3) - D10-6 (EGR3)	Always	Below 1 Ω
   D27-42 (EGR4) - D10-1 (EGR4)	Always	Below 1 Ω
   D27-45 (EGR1) or D10-4 (EGR1) - Body ground	Always	10 kΩ or higher
   D27-44 (EGR2) or D10-3 (EGR2) - Body ground	Always	10 kΩ or higher
   D27-43 (EGR3) or D10-6 (EGR3) - Body ground	Always	10 kΩ or higher
   D27-42 (EGR4) or D10-1 (EGR4) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Connect the intelligent tester to the DLC3.
   

2. Turn the power switch on (IG) and turn the tester on.
   

3. Clear the DTCs (Click here).
   

4. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
   

5. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

6. Read the DTCs.
   

   Result 

   Result	Proceed to
   DTC is not output	A
   DTC P0403 is output	B

B	REPLACE ECM (Click here)

A
END