Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141
TYPICAL MALFUNCTION THRESHOLDS
DTC P043E Evaporative Emission System Reference Orifice Clog Up |
DTC P043F Evaporative Emission System Reference Orifice High Flow |
DTC P2401 Evaporative Emission Leak Detection Pump Stuck OFF |
DTC P2402 Evaporative Emission Leak Detection Pump Stuck ON |
DTC P2419 Evaporative Emission System Switching Valve Control Circuit Low |
DTC SUMMARY
| DTC No. | Monitoring Item | Malfunction Detection Condition | Trouble Area | Detection Timing | Detection Logic |
| P043E | Reference orifice clogged | P043E, P043F, P2401, P2402 and P2419 stored when one of following conditions met during key-off EVAP monitor:
|
| While ignition switch off | 2 trip |
| P043F | Reference orifice high-flow | ||||
| P2401 | Leak detection pump stuck off | ||||
| P2402 | Leak detection pump stuck on | ||||
| P2419 | Vent valve stuck closed |
- HINT:
- The reference orifice is located inside the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System (COROLLA_ZRE142 RM0000011IO03GX_07.html).MONITOR DESCRIPTION
5 hours* after the ignition 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 below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.
| Sequence | Operation | Description | Duration |
| - | ECM activation | The key-off monitor is activated by soak timer 5, 7 or 9.5 hours after ignition switch turned off. | - |
| A | Atmospheric pressure measurement | Vent valve is turned OFF (vent) and the EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(abs)], the ECM cancels EVAP system monitor. | 60 seconds |
| B | First reference pressure measurement | In order to determine reference pressure, the leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if the leak detection pump and vent valve operate normally. | 60 seconds |
| C | EVAP system pressure measurement | Vent valve turned ON (closed) to shut the EVAP system. Negative pressure (vacuum) created in the EVAP system, and EVAP system pressure then measured. The measured value is memorized as it will be used in the leak check. If the EVAP pressure does not stabilize within 15 minutes, the ECM cancels EVAP system monitor. | 15 minutes* |
| D | Purge VSV monitor | Purge VSV is opened and then the EVAP system pressure is measured by the ECM. A large increase indicates normality. | 10 seconds |
| E | Second reference pressure measurement | After a second reference pressure measurement, the leak check is performed by comparing the first and second reference pressure. If stabilized system pressure is higher than second the reference pressure, the ECM determines that the EVAP system is leaking. | 60 seconds |
| - | Final check | Atmospheric pressure is measured and then the monitor result is recorded by the ECM. | - |
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) [726 to 750 mmHg(abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM will illuminate the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.
*: Typical value.
MONITOR STRATEGY
| Required Sensors/Components | Canister pump module |
| Frequency of Operation | Once per driving cycle |
| Duration | Within 2 minutes |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever following DTCs are not present | None |
| Atmospheric pressure | 70 kPa(abs) [525 mmHg(abs)] or more, and less than 110 kPa(abs) [825 mmHg(abs)] |
| Battery voltage | 10.5 V or more |
| Vehicle speed | Below 2.5 mph (4 km/h) |
| Ignition switch | Off |
| Time after key off | 5, 7 or 9.5 hours |
| Canister pressure sensor malfunction (P0452 and 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 are met before key off | Conditions 1 and 2 |
| 1. Duration that vehicle has been driven | 5 minutes or more |
| 2. EVAP purge operation | Performed |
| Engine coolant temperature | 4.4 to 35°C (40 to 95°F) |
| Intake air temperature | 4.4 to 35°C (40 to 95°F) |
TYPICAL MALFUNCTION THRESHOLDS
"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa(gauge) [2.14 mmHg(gauge)] in 60 seconds.| One of following conditions is met | - |
| EVAP pressure just after reference pressure measurement started | More than -1 kPa(gauge) [-7.5 mmHg(gauge)] |
| Reference pressure | Less than -4.85 kPa(gauge) [-36.4 mmHg(gauge)] |
| Reference pressure | -1.057 kPa(gauge) [-7.93 mmHg(gauge)] or more |
| Reference pressure | Not saturated within 60 seconds |
| Difference between first reference pressure and second reference pressure | 0.9 kPa(gauge) [6.75 mmHg(gauge)] or more |
MONITOR RESULT
Refer to Checking Monitor Status (Link).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 higher 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.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
- After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P043E, P043F, P2401, P2402 or P2419.
- 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
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 NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- DTC judgment completed
- If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).
- HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.