Toyota Tundra. Manual — part 1258
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If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.
Fig. 225: DTC & Malfunction Area Chart
DESCRIPTION
P2610
Soak timer (built into ECM)
NOTE:
If the reference pressure difference between the first and second checks is
greater than the specification, all the DTCs relating to the reference pressure
(P043E, P043F, P2401, P2402 and P2419) are stored.
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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Fig. 226: Identifying EVAP System Components Location
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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Fig. 227: EVAP System Circuit Diagram
While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened by
the ECM and stored fuel vapors in the canister are purged into the intake manifold. The ECM changes the duty
cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed
into the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure
(vacuum) is applied to the canister.
The following two monitors run to confirm the appropriate EVAP system operation.
1. Key-off monitor
This monitor checks for EVAP (Evaporative Emission) system leaks and canister pump module
malfunctions. The monitor starts 5 hours* after the ignition switch is turned OFF. At least 5 hours are
required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor
more accurate.
The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is
measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the
canister pump module and purge VSV, 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
NOTE:
In this vehicle's EVAP system, turning ON the vent valve does not seal off the
EVAP system. To check for leaks in the EVAP system, disconnect the air inlet
vent hose and apply pressure from the atmospheric side of the canister.
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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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.
2. Purge flow monitor
The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd
monitor is activated if necessary.
The 1st monitor
While the engine is running and the purge VSV (Vacuum Switching Valve) is ON (open), the ECM
monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not
created, the ECM begins the 2nd monitor.
The 2nd monitor
The vent valve is turned OFF (open) and the EVAP pressure is measured. If the variation in the
pressure is less than 0.5 kPa-g (3.75 mmHg-g), the ECM interprets this as the purge VSV being
stuck closed, and illuminates the MIL and sets DTC P0441 (2 trip detection logic).
Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and
after conduction of the purge flow monitor, is measured by the ECM.
Fig. 228: EVAP Purge Flow Diagram
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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