The secondary air injection monitor only runs after a cold soak procedure... best done by leaving the Tacoma parked overnight. Getting the air injection monitor to run after the engine has warmed up is not possible. If you've been trying to get the monitor ready after having already warmed up the truck you'll need to wait until the difference between IAT (Intake Air) and ECT (Coolant Temp) is less than 13F (7C). The cold soak procedure is as follow:
1a. Start the engine and allow ECT (Coolant Temp) to reach 176F (80C) or greater. (This can be done by letting the engine idle or by driving the vehicle.)
1b. Let the vehicle cold soak for 8 hours or until the difference between IAT (Intake Air) and ECT (Coolant Temp) is less than 13F (7C).
Air injection is used to improve cold-start exhaust emissions. By injecting fresh air into the exhaust stream, the catalytic converters heat up more quickly are therefore more effective at reducing harmful exhaust emissions. Once the catalytic converters are warmed up, the air injection system turns off. You should be able to here the high pitched whining of the air injection pump when the engine is first fired up from a cold start. The air injection system turns on at cold start and runs for 1 1/2 minutes until the ECU determines the exhaust system is sufficiently warm for efficient catalyst operation.
How to Perform Toyota Tacoma Drive Cycle (2RZ-FE / 3RZ-FE / 5VZ-FE)
Follow the drive cycle accurately. It is complex. If you feel you may be unable to perform the drive cycle below safely, please seek assistance from a reputable smog check repair station or Toyota dealership.
Begin by: (Make sure you have between 1/4 and 3/4 fuel in the gas tank. The EVAP test will not run while your Toyota Tacoma has a full tank of gas or the gas tank is near empty). Ensure there are no pending or active trouble codes and that the check engine light is not on.
A. Start the engine and allow it to idle for 10 minutes or more.
B. Drive the vehicle at 43-56 mph or more for 3 to 5 minutes. Be sure to maintain engine speed between 900 and 3,200 rpm.
C. Stop the vehicle and allow the engine to idle for 3 to 5 minutes.
D. Repeat steps B and C once.
E. Drive the vehicle at 40 mph to 55 mph for 3 minutes.
F. Drive the vehicle 35 mph to 45 mph for 7 minutes.
G. Stop the vehicle and turn off the engine. Release the pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
H. Start the engine and as soon as safely possible begin driving at approximately 45 mph for 5 minutes.
I. Drive the vehicle at approximately 25 mph for 15 minutes, and include a minimum of two stops for approximately 30 seconds each.
J. Stop the vehicle and allow the engine to idle for 2 minutes.
K. Drive the vehicle at 25 mph or more for at least 50 seconds. Make sure your engine speed is above 900 rpm.
L. Stop the vehicle and allow the engine to idle for 40 seconds or more.
M. Perform steps “K” and “L” ten times.
If readiness status of all monitors do not switch to “complete,” ensure preconditions are met, turn the ignition switch OFF, then repeat steps “A” through “M.” Completing the Toyota Tacoma drive cycle above should set the emission monitors required to pass the smog check. Take extra caution when performing drive cycles on public roadways. If you feel you will be unable to complete the driving pattern above safely, seek assistance from a reputable smog check repair station or Toyota repair facility.
