DTC SUMMARY
DTC No. |
Monitoring Item |
Malfunction Detection Condition |
Trouble Area |
Detection Timing |
Detection Logic |
---|---|---|---|---|---|
P0451 |
Canister pressure sensor abnormal voltage fluctuation |
Sensor output voltage fluctuates frequently in a certain time period. |
|
|
2 trip |
Canister pressure sensor constant voltage |
Sensor output voltage does not vary in a certain time period. |
|
2 trip |
||
P0452 |
Canister pressure sensor low input |
EVAP pressure sensor less than 42.11009 kPa(abs) [315.86779 mmHg(abs)] for 0.5 seconds. |
|
1 trip |
|
P0453 |
Canister pressure sensor high input |
EVAP pressure sensor higher than 123.76147 kPa(abs) [928.33479 mmHg(abs)] for 0.5 seconds. |
|
1 trip |
HINT:
The canister pressure sensor is built into the canister pump module.
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System (See page ).
MONITOR DESCRIPTION
If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, 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 2 minutes, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and stores the DTC.
(Both the malfunctions are detected by 2 trip detection logic).
If the canister pressure sensor voltage output (pressure) is less than 0.45 V: 42.11009 kPa(abs) [315.86779 mmHg(abs)], the ECM interprets this as an open or short circuit 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).
If the canister pressure sensor voltage output (pressure) is higher than 4.9 V: 123.76147 kPa(abs) [928.33479 mmHg(abs)], the ECM interprets this as an open or short circuit 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 (Main) |
Canister pump module |
Required Sensors/Components (Related) |
- |
Frequency of Operation |
Continuous |
Duration |
0.5 seconds: P0452 and P0453 Within 2 minutes: P0451 (sensor stuck) Less than 15 seconds: P0451 (sensor noise) |
MIL Operation |
Immediate: P0452 and P0453 2 driving cycles: P0451 |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
P0451: Noise Monitoring
Monitor runs whenever the following DTCs are not stored |
None |
All of the following conditions are met |
- |
Atmospheric pressure (absolute pressure) |
70 kPa(abs) [525 mmHg(abs)] or higher, and less than 110 kPa(abs) [825 mmHg(abs)] mmHg(abs)] |
Battery voltage |
10.5 V or higher |
Intake air temperature |
4.4°C (40°F) or higher, and less than 50°C (122°F) |
Canister pressure sensor malfunction (P0452, P0453) |
Not detected |
Either of the following conditions is met |
A or B |
A. Engine condition |
Running |
B. Time after key-off |
5, 7 or 9.5 hours |
Monitor runs whenever the following DTCs are not stored |
None |
All of the following conditions are met |
- |
Battery voltage |
10.5 V or higher |
Intake air temperature |
4.4°C (40°F) or higher, and less than 50°C (122°F) |
Canister pressure sensor malfunction (P0452, P0453) |
Not detected |
Atmospheric pressure (absolute pressure) |
70 kPa(abs) [525 mmHg(abs)] or higher, and less than 110 kPa(abs) [825 mmHg(abs)] |
Time after key-off |
5, 7 or 9.5 hours |
Monitor runs whenever the following DTCs are not stored |
None |
All of the following conditions are met |
- |
Either of the following conditions is met |
(a) or (b) |
(a) Ignition switch |
ON |
(b) Soak timer |
On |
Battery voltage |
8 V or higher |
Starter |
Off |
TYPICAL MALFUNCTION THRESHOLDS
P0451: Canister Pressure Sensor Noise Monitoring
Frequency that EVAP pressure change 0.3 kPa [2.25 mmHg] or higher |
10 times or more in 10 seconds |
EVAP pressure change during reference pressure measurement |
Less than 0.65 kPa(gauge) [4.876 mmHg(gauge)] |
EVAP pressure |
Less than 42.11009 kPa(abs) [315.86779 mmHg(abs)] |
EVAP pressure |
Higher than 123.76147 kPa(abs) [928.33479 mmHg(abs)] |
CONFIRMATION DRIVING PATTERN
NOTICE:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CONFIRM DTC AND EVAP PRESSURE |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON (do not start the engine).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
(f) Enter the following menus: Powertrain / Engine / Data List / Vapor Pressure Pump.
(g) Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.
Display (DTC Output) |
Test Result |
Suspected Trouble Area |
Proceed to |
---|---|---|---|
P0451 |
- |
Canister pressure sensor |
C |
P0452 |
Less than 42.11009 kPa(abs) [315.86779 mmHg(abs)] |
|
A |
P0453 |
Higher than 123.76147 kPa(abs) [928.33479 mmHg(abs)] |
|
B |
B |
GO TO STEP 4 |
C |
GO TO EVAP SYSTEM |
|
2. |
CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Tester Connection |
Condition |
Specified Condition |
Suspected Trouble Area |
Proceed to |
---|---|---|---|---|
B58-114 (PPMP) - Body ground |
Always |
10 Ω or less |
|
A |
10 kΩ or higher |
|
B |
B |
GO TO STEP 7 |
|
3. |
CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
(a) Disconnect the canister pump module connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Tester Connection |
Condition |
Specified Condition |
Suspected Trouble Area |
Proceed to |
---|---|---|---|---|
B58-114 (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 |
A |
GO TO STEP 5 |
B |
GO TO STEP 6 |
4. |
CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) |
(a) Disconnect the canister pump module connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
L32-8 (SGND) - Body ground |
Always |
100 Ω or less |
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
L32-6 (VCC) - Body ground |
Ignition switch ON |
4.5 to 5.5 V |
L32-7 (VOUT) - Body ground |
Ignition switch ON |
4.5 to 5.5 V |
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 |
*1 |
Front view of wire harness connector (to Canister Pump Module) |
- |
- |
B |
GO TO STEP 6 |
|
5. |
REPLACE CANISTER PUMP MODULE |
(a) Replace the canister pump module (See page ).
NOTICE:
*1 |
Fuel Tank Vent Hose |
*2 |
Air Inlet Port |
*3 |
Vent Hose |
*4 |
Fuel Tank |
*5 |
Canister Pump Module |
*6 |
Canister |
*7 |
Canister Filter |
- |
- |
*a |
Inspection Area (check for disconnection and/or cracks) |
- |
- |
NEXT |
GO TO STEP 8 |
6. |
REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) |
HINT:
If the exhaust tailpipe has been removed, go to the next step before reinstalling it.
NEXT |
GO TO STEP 8 |
7. |
REPLACE ECM |
(a) Replace the ECM (See page ).
|
8. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P0451, P0452 OR P0453) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page ).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Turn the ignition switch to ON.
(g) Turn the Techstream on.
(h) Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the DTC: P0451, P0452 or P0453.
(k) Check the DTC judgment result.
Result
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
NEXT |
END |
Precaution
PRECAUTION
1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following system after the terminal is reconnected:
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