The purpose of the SAP secondary air injection system P2442 is to pump fresh air into the exhaust system. This process reduces harmful pollutants by the exhaust. The PCM receives information from the secondary air injection system regarding pressure and flow.
If the secondary air injection system sends a voltage signal reading to the PCM that exceeds the manufacturer’s specification than the vehicle simply go into Limp or restrictive mode. This will cause poor performance and some people who mask this error Secondary Air Pump P2442 will still have poor performance.
In Japan, the Land Cruiser had an update in 2009 when it received the 4.6 L V8 1UR-FE engine and the gearbox was replaced with a 6-speed automatic. The new 4608 cc 1UR-FE is smaller than the old 4663 cc 2UZ-FE engine. The power is increased 234kw from 212 kW ( 314 hp to 284 ). Torque increase is almost from 448 to 460 N⋅m (330 to 339 lb⋅ft). The fuel consumption is improved to 7.1 from 6.5 km/L.
Starting in 2011 (362 hp) 3UR-FE engine was offered alongside with the previous engines. For 2012, the 1GR-FE gained dual VVT-i and power was increased to 202 kW ( 271 hp). The 4.7 L 2UZ-FE was dropped in favour of the new 227 kW (304 hp) 4.6 L 1UR-FE, and the 5.7 L and 4.5 L diesel were unchanged.
Common Error codes related to Secondary Air Pump are
What causes the P2440 code?
Faulty air injection valve
Faulty one-way check valve
Air injection pump poor performance
Pressure sensor problem
Damaged or corroded Pressure sensor connector
Pressure sensor connector that has bent pins
Faulty vacuum switching valve
What are the symptoms of the P2440 code?
Check Engine Light is on
Secondary air injection system may be noisy
Engine may stall when idling
P2440 diagnostic trouble code stored in the PCM
How serious is the P2440 code?
When the P2440 diagnostic trouble code is stored by the PCM the vehicle may stall out or hesitate during operation. Driving under these conditions is dangerous.