DI
−
618
−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
DTC No.
DTC Detection Condition
Trouble Area
P2440
Although the ECM has ordered the VSV to close the air switch-
ing valve while the engine is running but the pressure sensor
detects pulsation of the exhaust gas
S
VSV
S
Air switching valve
S
Open or short in VSV circuit
S
Pressure sensor
S
Open or short in pressure sensor circuit
S
ECM
P2441
Although the ECM has ordered the VSV to open the air switch-
ing valve while the engine is running but the pressure sensor is
unable to detect pulsation of the exhaust gas
S
VSV
S
Air switching valve
S
Open or short in VSV circuit
S
Vacuum hose and check valve
S
Air injection hose
S
Pressure sensor
S
Open or short in pressure sensor circuit
S
ECM
MONITOR DESCRIPTION
The ECM observes the pressure in the secondary air passage using the pressure sensor located on the air
switching valve in the secondary air injection system. The sensor detects an exhaust pressure in the second-
ary air passage.
If the ECM receives the pulsation signal from the sensor despite the ECM ordering the VSV to close the air
switching valve, or if the ECM has not received the signal from the sensor despite the ECM ordering the VSV
to open the valve, the ECM interprets this as a fault in the secondary air injection system and sets a DTC.
MONITOR STRATEGY
Related DTCs
P2440
AIR control valve stuck open
P2441
AIR control valve stuck closed
Required sensors/components
Pressure sensor
Frequency of operation
Continuous
Duration
2 min.
MIL operation
2 driving cycles
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
Item
Specification
Minimum
Maximum
The monitor will run whenever these
DTCs are not present
See page DI
−
295
Battery voltage
11 V
−
Atmosphere pressure
45 kPa (0.46 kg/cm
2
)
−
Engine
Running
P2440:
Air pump and air switching valve: OFF
10 sec.
−
P2441:
Air pump and air switching valve: ON
6 sec.
−
816
Содержание Celica 2005
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