Toyota Tundra (2015 year). Manual — part 2024
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002BHC08MX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420; Evaporative Emission System Switching
Valve Control Circuit High; 2015 MY Tundra [08/2014 - ]
DTC
P2420
Evaporative Emission System Switching Valve Control Circuit High
DTC SUMMARY
DTC
CODE
MONITORING
ITEM
MALFUNCTION
DETECTION CONDITION
TROUBLE AREA
DETECTION
TIMING
DETECTION
LOGIC
P2420
Vent valve
stuck open
(vent)
Following condition met
during key-off EVAP
monitor:
EVAP pressure
change when
vent valve
closed (ON)
less than 0.3
kPa-g (2.25
mmHg-g)
Canister pump
module (Reference
orifice, leak
detection pump,
vent valve)
Connector/wire
harness (Canister
pump module -
ECM)
ECM
While
ignition
switch off
2 trip
HINT:
The vent valve is built into the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Evaporative Emission) System
.
INSPECTION PROCEDURE
Refer to the EVAP System
.
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
Activated by soak timer 5, 7 or 9.5 hours after
ignition switch turned off.
-
A
Atmospheric
pressure
measurement
Vent valve turned OFF (vent) and EVAP system
pressure measured by ECM in order to register
atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a
and 110 kPa-a (525 mmHg-a and 825 mmHg-a),
60 seconds
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420; Evapor...
SEQUENCE
OPERATION
DESCRIPTION
DURATION
ECM cancels EVAP system monitor.
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*1
300
seconds*2
C
EVAP system
pressure
measurement
Vent valve turned ON (closed) to shut EVAP
system.
Negative pressure (vacuum) created in EVAP
system, and EVAP system pressure 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*1*3
30
minutes*2,
*3
D
Purge VSV monitor
Purge VSV opened and then EVAP system pressure
measured by ECM.
Large increase indicates normality.
10 seconds
E
Second reference
pressure
measurement
After second reference pressure measurement,
leak check performed by comparing first and
second reference pressure.
If stabilized system pressure higher than second
reference pressure, ECM determines that EVAP
system leaking.
60 seconds
-
Final check
Atmospheric pressure measured and then
monitoring result recorded by ECM.
-
*1: for 100 L (26.4 US gal) Fuel Tank
*2: for 144 L (38 US gal) Fuel Tank
P2420: Vent valve stuck open (vent)
In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by the ECM
using the canister pressure sensor to conduct an EVAP leak check. If the pressure does not increase when the
vent valve is open, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL
and sets the DTC.
MONITOR STRATEGY
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420; Evapor...
Required Sensors/Components
Purge VSV and canister pump module
Duration
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
P0452, P0453 (EVAP System)
Atmospheric pressure
70 to 111 kPa-a (525 to 833 mmHg-a)
Battery voltage
10.5 V or more
Vehicle speed
Below 4 km/h (2.5 mph)
Ignition switch
Off
Time after key off
5 or 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
1. Duration that vehicle driven
5 minutes or more
2. EVAP purge operation
Performed
ECT
4.4 to 35°C (40 to 95°F)
IAT
4.4 to 35°C (40 to 95°F)
TYPICAL MALFUNCTION THRESHOLDS
EVAP pressure change after EVAP canister vent valve ON
Less than 0.3 kPa-g (2.25 mmHg-g)
MONITOR RESULT
Refer to CHECKING MONITOR STATUS
.
CONFIRMATION DRIVING PATTERN
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420; Evapor...
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