DTC    P0451    Evaporative Emission Control System Pressure Sensor Range / Performance
DTC    P0452    Evaporative Emission Control System Pressure Sensor / Switch Low Input
DTC    P0453    Evaporative Emission Control System Pressure Sensor / Switch High Input

for Preparation Click here

DTC SUMMARY

HINT:

The canister pressure sensor is built into the canister pump module.

DESCRIPTION

MONITOR DESCRIPTION

1. DTC P0451: Canister pressure sensor noise or fixed/flat
   If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC.
   Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and stores the DTC (both malfunctions are detected by 2 trip detection logic).
   
2. DTC P0452: Canister pressure sensor voltage is low
   If the canister pressure sensor output [pressure] is below 42.1 kPa-a (315.9 mmHg-a), the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).
   
3. DTC P0453: Canister pressure sensor voltage is high
   If the canister pressure sensor output [pressure] is 123.8 kPa-a (928.4 mmHg-a) or higher, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC (1 trip detection logic).
   

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

NOTICE:

1. The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
   
2. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
   
3. Do not run the engine during this operation.
   
4. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).
   

1. Connect the Techstream to the DLC3.
   
2. Turn the ignition switch to ON and turn the Techstream on.
   
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
   
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
   
5. Turn the ignition switch off and wait for at least 30 seconds.
   
6. Turn the ignition switch to ON and turn the Techstream on [A].
   
7. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
   
8. After Evaporative System Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All readiness.
   
9. Input the DTC: P0451, P0452 or P0453.
   
10. Check the DTC judgment result [B].
    
    

    Techstream 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
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    If the judgment result shows ABNORMAL, the system has a malfunction.

11. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (Click here).
    

    HINT:

    1. If a permanent DTC is output, the system is malfunctioning.
       
    2. If no permanent DTC is output, the system is normal.
       

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When a vehicle is brought into the workshop, leave it as it is. Do not change the condition of the vehicle. For example, do not tighten the fuel tank cap assembly.
   
2. The Techstream is required to conduct the following diagnostic troubleshooting procedure.
   

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON (do not start the engine).
   

3. Turn the Techstream on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
   

5. Read the DTCs.
   

6. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump.
   

7. Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.
   
   

   Result 

   Display (DTC Output)	Test Result	Suspected Trouble Area	Proceed to
   P0451	-	Canister pressure sensor	C
   P0452	Below 42.1 kPa-a (315.9 mmHg-a)	Wire harness/connector (ECM - Canister pressure sensor) Canister pressure sensor Short in ECM circuit	A
   P0453	Higher than 123.8 kPa-a (928.4 mmHg-a)	Wire harness/connector (ECM - Canister pressure sensor) Canister pressure sensor Open in ECM circuit	B

B	Go to step 4
C	GO TO EVAP SYSTEM (Click here)

A

1. Turn the ignition switch off.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Result 

   Tester Connection	Condition	Test Result	Suspected Trouble Area	Proceed to
   D74-121 (PPMP) - Body ground	Always	10 Ω or less	Wire harness/connector (ECM - Canister pressure sensor) Short in canister pressure sensor circuit	A
   		10 kΩ or higher	Wire harness/connector (ECM - Canister pressure sensor) Short in ECM circuit	B

4. Reconnect the ECM connector.
   

B	Go to step 7

A

1. Disconnect the canister pump module connector.
   

2. Disconnect the ECM connector.
   

3. Measure the resistance according to the value(s) in the table below.
   
   

   Result 

   Tester Connection	Condition	Test Result	Suspected Trouble Area	Proceed to
   D74-121 (PPMP) - Body ground	Always	10 kΩ or higher	Short in canister pressure sensor circuit	A
   		10 Ω or less	Short in wire harness/connector (ECM - Canister pressure sensor)	B

4. Reconnect the canister pump module connector.
   

5. Reconnect the ECM connector.
   

A	Go to step 5
B	Go to step 6

1. Disconnect the canister pump module connector.
   

2. Measure the resistance according to the value(s) in the table below.
   
   

   Standard Resistance:

   
   

   Tester Connection	Condition	Specified Condition
   R12-8 (SGND) - Body ground	Always	100 Ω or less

3. Turn the ignition switch to ON.
   

4. Measure the voltage according to the value(s) in the table below.
   
   

   Standard Voltage:

   
   

   Tester Connection	Switch Condition	Specified Condition
   R12-6 (VCC) - Body ground	Ignition switch ON	4.5 to 5.5 V
   R12-7 (VOUT) - Body ground	Ignition switch ON	4.5 to 5.5 V

   
   

   Result 

   Test Result	Suspected Trouble Area	Proceed to
   Voltage and resistance within standard ranges	Open in canister pressure sensor circuit	A
   Voltage and resistance outside standard ranges	Open in wire harness/connector (ECM - Canister pressure sensor)	B

B	Go to step 6

A

1. Replace the canister pump module (Click here).
   

   NOTICE:

   1. When replacing the canister pump module, check the canister pump module interior, canister interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the canister interior, replace the canister and canister pump module together.
      
   2. Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
      
   3. Check for filter blockage in the canister filter. If the canister filter has blockages, replace the fuel tank inlet pipe sub-assembly.
      
   
   
   
   
   

   Text in Illustration 

   *1	Fuel Tank	*2	Fuel Tank Vent Hose
   *3	Canister Assembly	*4	Canister Pump Module - Canister Pressure Sensor - Leak Detection Pump - Vent Valve
   *5	Fuel Tank Inlet Pipe Sub-Assembly (Canister Filter)	*6	Canister Outlet Hose
   *a	Inspection Area (check for disconnection and/or cracks)	-	-

NEXT	Go to step 8

HINT:

If the exhaust pipe has been removed, go to the next step before reinstalling it.

NEXT	Go to step 8

1. Replace the ECM (Click here).
   

NEXT

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON and turn the Techstream on.
   

3. Clear the DTCs (Click here).
   

4. Turn the ignition switch off and wait for at least 30 seconds.
   

5. Turn the ignition switch to ON and turn the Techstream on.
   

6. Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.
   

7. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
   

8. Input the DTC: P0451, P0452 or P0453.
   

9. Check the DTC judgment result.
   

   HINT:

   If the DTC judgment result is NORMAL, the repair has been successfully completed.

NEXT
COMPLETED