Toyota 2GR-FE Manual page 537

DTC P2420
DTC SUMMARY
DTC No. Monitoring Item
Vent valve stuck
P2420
open (vent)
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-400).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-400).
MONITOR DESCRIPTION
*1
5 hours after the ignition switch is turned off, the electric vacuum pump creates negative pressure
(vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator
malfunctions based on the EVAP pressure.
HINT:
*1: 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 Operations
- ECM activation
Atmospheric pressure
A
measurement
First 0.02 inch leak pressure
B
measurement
EVAP system pressure
C
measurement
D Purge VSV monitor
Second 0.02 inch leak pressure
E
measurement
F Final check
*2
: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Evaporative Emission System Switching Valve
Control Circuit High
DTC Detection Condition
The following condition is met
during key-off EVAP monitor
• EVAP pressure change when
vent valve is closed (ON) less
than 2.3 mmHg
Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch
turned off.
Vent valve turned OFF (vent) and EVAP system pressure measured
by ECM in order to register atmospheric pressure.
If pressure in EVAP system is not between 70 kPa and 110 kPa (525
mmHg and 825 mmHg), ECM cancels EVAP system monitor.
In order to determine 0.02 inch leak pressure standard, vacuum pump
creates negative pressure (vacuum) through 0.02 inch orifice and then
ECM checks if vacuum pump and vent valve operate normally.
Vent valve is turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) is created in EVAP system, and then
EVAP system pressure is measured. Write down measured value as
they will be used in leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels
EVAP system monitor.
Purge VSV is opened and then EVAP system pressure is measured
by ECM.
Large increase indicates normal.
After second 0.02 inch leak pressure measurement, leak check is
performed by comparing first and second 0.02 inch leak pressure
standards.
If stabilized system pressure is higher than second 0.02 inch leak
pressure standard, ECM determines that there is a leak in EVAP
system.
Atmospheric pressure is measured and then monitoring result is
recorded by ECM.
Trouble Area
• Pump module (0.02 inch
orifice, vacuum pump, vent
valve)
• Connector / wire harness
(Pump module - ECM)
• ECM
Descriptions
ES–381
Detection
Detection Timing
Logic
Ignition switch off 2 trip
Duration
-
10 seconds
60 seconds
*2
15 minutes
10 seconds
60 seconds
-
ES