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
DTC No. | Monitoring Item | Malfunction Detection Condition | Trouble Area | Detection Timing | Detection Logic |
P0451 | Canister pressure sensor signal noise | Sensor output voltage fluctuates frequently within a certain time period. |
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| 2 trip |
P0451 | Canister pressure sensor becomes fixed/flat | Sensor output voltage does not vary within certain time period. |
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| 2 trip |
P0452 | Canister pressure sensor low input | EVAP pressure is below 42.1 kPa-a (315.9 mmHg-a) for 0.5 seconds. |
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| 1 trip |
P0453 | Canister pressure sensor high input | EVAP pressure is higher than 123.8 kPa-a (928.4 mmHg-a) for 0.5 seconds. |
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| 1 trip |
- HINT:
- The canister pressure sensor is built into the canister pump module.
DESCRIPTION
Refer to EVAP (Evaporative Emission) System (Click here).MONITOR DESCRIPTION
- 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). - 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). - 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
Required Sensors/Components | Canister pump module |
Frequency of Operation | Once per driving cycle: P0451 sensor fixed/flat Continuous: P0451 sensor noise, P0452 and P0453 |
Duration | Within 15 seconds: P0451 sensor noise Within 2 minutes: P0451 sensor fixed/flat 0.5 seconds: P0452 and P0453 |
MIL Operation | Immediate: P0452 and P0453 2 driving cycles: P0451 |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not stored | P0452, P0453 (EVAP System) |
Atmospheric pressure (absolute pressure) | 70 to 110 kPa-a (525 to 825 mmHg-a) |
Battery voltage | 10.5 V or higher |
Intake air temperature | 4.4 to 35°C (40 to 95°F) |
Either of following conditions met | A or B |
A. Engine condition | Running |
B. Time after key-off | 5, 7 or 9.5 hours |
Monitor runs whenever following DTCs not stored | P0452, P0453 (EVAP System) |
Battery voltage | 10.5 V or more |
Intake air temperature | 4.4 to 35°C (40 to 95°F) |
Atmospheric pressure (absolute pressure) | 70 to 110 kPa-a (525 to 825 mmHg-a) |
Time after key-off | 5, 7 or 9.5 hours |
Monitor runs whenever following DTCs not stored | None |
Battery voltage | 8 V or more |
Starter | OFF |
Either of following conditions met | (a) or (b) |
(a) Ignition switch | ON |
(b) Soak timer | ON |
TYPICAL MALFUNCTION THRESHOLDS
Frequency that EVAP pressure changes 0.3 kPa-g (2.25 mmHg-g) or more | 10 times or more in 10 seconds |
EVAP pressure change during reference pressure measurement | Less than 0.65 kPa-a (4.87 mmHg-a) |
EVAP pressure | Below 42.1 kPa-a (315.9 mmHg-a) |
EVAP pressure | Higher than 123.8 kPa-a (928.4 mmHg-a) |
CONFIRMATION DRIVING PATTERN
- NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
- 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.
- Do not run the engine during this operation.
- 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).
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
- After Evaporative System Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All readiness.
- Input the DTC: P0451, P0452 or P0453.
- 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.
- DTC judgment completed
- 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:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- 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.
- The Techstream is required to conduct the following diagnostic troubleshooting procedure.
1.CONFIRM DTC AND EVAP PRESSURE |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON (do not start the engine).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
Read the DTCs.
Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump.
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 - Wire harness/connector (ECM - Canister pressure sensor)
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2.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
Turn the ignition switch off.
Disconnect the ECM connector.
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 - Wire harness/connector (ECM - Canister pressure sensor)
Reconnect the ECM connector.
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A | |
3.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
Disconnect the canister pump module connector.
Disconnect the ECM connector.
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
Reconnect the canister pump module connector.
Reconnect the ECM connector.
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4.CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
Disconnect the canister pump module connector.
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
Turn the ignition switch to ON.
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
*a | Front view of wire harness connector (to Canister Pump Module) |
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A | |
5.REPLACE CANISTER PUMP MODULE |
Replace the canister pump module (Click here).
- NOTICE:
- 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.
- Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
- 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) - -
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6.REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) |
- HINT:
- If the exhaust pipe has been removed, go to the next step before reinstalling it.
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7.REPLACE ECM |
Replace the ECM (Click here).
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8.CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (Click here).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0451, P0452 or P0453.
Check the DTC judgment result.
- HINT:
- If the DTC judgment result is NORMAL, the repair has been successfully completed.
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