Toyota Sienna Service Manual: Evaporative Emission Control System Leak Detected
DTC SUMMARY
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-409).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-412).
MONITOR DESCRIPTION
5 hours*1 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.
*2: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
1. P0455: EVAP (Evaporative Emission) gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL and sets the DTC (2 trip detection logic).
2. P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pressure standard, the ECM determines that the EVAP system has a small leak, illuminates the MIL and sets the DTC (2 trip detection logic).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Key-off monitor sequence 1 to 8
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
Evaporative Emission Control System Incorrect Purge Flow
DTC SUMMARY
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission)
System (See page ES-409).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-412).
MO ...
Vehicle Speed Sensor "A"
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ECU.
The skid control ECU converts these wheel speed signals into a 4-pulse signal ...
Other materials:
On-vehicle inspection
1. INSPECT FUEL CUT RPM
(a) Increase the engine speed to at least 3500 rpm.
(b) Use a sound scope to check for injector operating
sounds.
(c) Check that when the throttle lever is released,
injector operating sounds stop momentarily (at 2500
rpm) and then resume (at 1400 rpm).
Standard
...
Idle Control System Malfunction
DTC P0505 Idle Control System Malfunction
DESCRIPTION
The idling speed is controlled by the ETCS (Electronic Throttle Control
System). The ETCS is comprised
of: 1) the one valve type throttle body; 2) the throttle actuator, which
operates the throttle valve; 3) the
Throttle Position (TP) sen ...
CD Sound Skips
INSPECTION PROCEDURE
1 CHECK CD
Check the CD.
OK:
The CD is clean.
HINT:
If dirt is on the CD surface, wipe it clean with a soft cloth
from the inside to the outside in a radial direction.
NOTICE:
Do not use a conventional record cleaner or antistatic
preservative.
2 CHECK CD
...
