Toyota Celica 2005 Repair Manual page 817

DI−618
DTC No.
Although the ECM has ordered the VSV to close the air switch-
P2440 ing valve while the engine is running but the pressure sensor
detects pulsation of the exhaust gas
Although the ECM has ordered the VSV to open the air switch-
P2441 ing valve while the engine is running but the pressure sensor is
unable to detect pulsation of the exhaust gas
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
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
TYPICAL ENABLING CONDITIONS
Item
The monitor will run whenever these
DTCs are not present
Battery voltage
Atmosphere pressure
Engine
P2440:
Air pump and air switching valve: OFF
P2441:
Air pump and air switching valve: ON
DIAGNOSTICS
DTC Detection Condition
Pressure sensor
Continuous
2 min.
2 driving cycles
None
Minimum
45 kPa (0.46 kg/cm
− ENGINE (2ZZ−GE)
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
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
P2440
P2441
Specification
See page DI−295
11 V
2
)
Running
10 sec.
6 sec.
816
Trouble Area
AIR control valve stuck open
AIR control valve stuck closed
Maximum
−
−
−
−