Lexus ES: Evaporative Emission System Leak Detection Reference Orifice Low Flow (P043E00,P043F00,P24007E,P24007F,P24187E)
DTC SUMMARY
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P043E00 | Evaporative Emission System Leak Detection Reference Orifice Low Flow | Reference orifice clogged during key-off EVAP monitor |
| Comes on | DTC stored | SAE Code: P043E |
| P043F00 | Evaporative Emission System Leak Detection Reference Orifice High Flow | Reference orifice high-flow during key-off EVAP monitor |
| Comes on | DTC stored | SAE Code: P043F |
| P24007E | Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck On | Leak detection pump on malfunction during key-off EVAP monitor |
| Comes on | DTC stored | SAE Code: P2402 |
| P24007F | Evaporative Emission System Leak Detection Pump Control Circuit Actuator Stuck Off | Leak detection pump off malfunction during key-off EVAP monitor |
| Comes on | DTC stored | SAE Code: P2401 |
| P24187E | Evaporative Emission System Switching Valve Control Circuit Actuator Stuck On | Vent valve on (closed) malfunction during key-off EVAP monitor |
| Comes on | DTC stored | SAE Code: P2419 |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic | SAE |
|---|---|---|---|---|
| P043E00 | Reference orifice clogged | EVAP monitoring (engine switch off) | 2 trip | P043E |
| P043F00 | Reference orifice high-flow | P043F | ||
| P24007E | Leak detection pump stuck ON | P2402 | ||
| P24007F | Leak detection pump stuck OFF | P2401 | ||
| P24187E | Vent valve stuck closed | P2419 |
HINT:
The reference orifice is located inside the canister pump module.
DESCRIPTION
The description can be found in EVAP (Evaporative Emission) System.
Click here .gif)
MONITOR DESCRIPTION
5 hours* after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.
| Sequence | Operation | Description | Duration |
|---|---|---|---|
| - | ECM activation | Activated by soak timer, 5, 7 or 9.5 hours after engine switch turned off. | - |
| A | Atmospheric pressure measurement | Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 to 110 kPa(abs) [10.15 to 15.95 psi(abs)], ECM cancels EVAP system monitor. | 60 seconds |
| B | First reference pressure measurement | In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally. | 360 seconds |
| C | EVAP system pressure measurement | Vent valve is turned on (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured. Write down measured value as it will be used in leak check If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor. | 15 minutes* |
| D | Purge VSV monitor | Purge VSV is opened and then EVAP system pressure is measured by ECM. Large increase indicates normal. | 10 seconds |
| E | Second reference pressure measurement | After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking. | 60 seconds |
| - | Final check | Atmospheric pressure is measured and then monitoring result is recorded by ECM. | - |
*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
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| *1 | Purge VSV: Off (Closed) | *2 | Purge VSV: On (Open) |
| *3 | Vent Valve: Off (Vent) | *4 | Vent Valve: On (Closed) |
| *5 | Leak Detection Pump: Off | *6 | Leak Detection Pump: On |
| *7 | Reference Orifice (0.02 inch) | *8 | Canister Pressure Sensor |
| *9 | Canister | *10 | Fuel Tank |
| *11 | Canister Pump Module | *12 | Canister Filter |
| *a | Operation A: Atmospheric Pressure Measurement | *b | Operation B, E: Reference Pressure Measurement |
| *c | Operation C: EVAP System Pressure Measurement | *d | Operation D: Purge VSV Monitor |
| *e | Atmospheric Pressure | *f | Negative Pressure |
The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [14.07 to 14.5 psi(abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.
*: Typical value.
MONITOR STRATEGY
| Required Sensors/Components (Main) | Canister pump module |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Once per driving cycle |
| Duration | Within 7 minutes |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever the following DTCs are not stored | None |
| Atmospheric pressure | 70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)] |
| Battery voltage | 10.5 V or higher |
| Vehicle speed | Less than 4 km/h (2.5 mph) |
| Engine switch | Off |
| Time after key-off | 5, 7 or 9.5 hours |
| Canister pressure sensor malfunction (P0452, P0453) | Not detected |
| Purge VSV | Not operated by scan tool |
| Vent valve | Not operated by scan tool |
| Leak detection pump | Not operated by scan tool |
| Both of following conditions met before key-off | 1 and 2 |
| 1. Duration that vehicle is driven | 5 minutes or more |
| 2. EVAP purge operation | Performed |
| Engine coolant temperature | 4.4°C (40°F) or higher, and less than 35°C (95°F) |
| Intake air temperature | 4.4°C (40°F) or higher, and less than 35°C (95°F) |
TYPICAL MALFUNCTION THRESHOLDS
"Saturated" indicates that the EVAP pressure change is below 0.286 kPa(gauge) [0.041 psi(gauge)] in 60 seconds.
| One of following conditions met | - |
| EVAP pressure just after reference pressure measurement started | Higher than -0.242 kPa(gauge) [-0.01 psi(gauge)] |
| Reference pressure | Less than -4.85 kPa(gauge) [-0.703 psi(gauge)] |
| Reference pressure | -1.068 kPa(gauge) [-0.155 psi(gauge)] or higher |
| Reference pressure | Not saturated within 360 seconds |
| Difference between first reference pressure and second reference pressure | 0.9 kPa(gauge) [0.13 psi(gauge)] or higher |
MONITOR RESULT
Refer to EVAP system.
Click here
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 24 minutes.
- Do not perform the Evaporative System Check when the fuel tank is higher than 85% 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 less than 35°C (95°F).
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG) [A].
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
- After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P043E00, P043F00, P24007E, P24007F or P24187E.
-
Check the DTC judgment result.
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
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
-
[A] to [B]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
PROCEDURE
| 1. | GO TO EVAP SYSTEM |
(a) Refer to EVAP System.
Click here
| NEXT | .gif) | END |
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Components
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