Toyota Tundra. Manual — part 1378

Fig. 141: Secondary Air Injection System Switching Valve (Bank 1) - Wiring Diagram

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 142: Secondary Air Injection System Switching Valve (Bank 2) - Wiring Diagram

INSPECTION PROCEDURE

HINT:

The diagnostic information output from Air Injection Control Driver (AID) can be confirmed by connecting an
oscilloscope to the diagnostic information terminal of the AID. Reading the waveform while performing the
AIR system intrusive operation provided in the System Check function allows the possible trouble areas to be
narrowed down.

NOTE:



This Air Injection Check only allows technicians to operate the AIR system
for a maximum of 5 seconds. Furthermore, the check can only be

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

AID DIAGNOSTIC SIGNAL WAVEFORMS REFERENCE

performed up to 4 times per trip. If the test is repeated, intervals of at least
30 seconds are required between checks. While AIR system operation
using the Techstream is prohibited, the Techstream display indicates the
prohibition (WAIT or ERROR).

If an ERROR is displayed on the Techstream during the test, stop the
engine for 10 minutes, and then try again.



Performing the Air Injection Check repeatedly may cause damage to the
AIR system. If necessary, leave an interval of several minutes between
System Check operations to prevent the system from overheating.



When performing the Air Injection Check operation after the battery cable
has been reconnected, wait for 7 minutes with the ignition switch turned to
ON or the engine running.



Turn the ignition switch off when the Air Injection Check operation
finishes.

AID Diagnostic Signal

Waveforms

ECM Commands

DTCs

(ECM

Output)

Suspected Trouble Areas

Any Secondary Air

Injection (AIR)

System operation

P1613
P1614



Open in diagnostic signal
circuit



Air Injection Control Driver
(AID)



Open in AID BATT circuit
(AID power source)



Short between +B and
diagnostic signal circuits

AIR System: ON (Air

pump ON, ASV ON)

P1613
P1614



Open or short in air pump or
Air Switching Valve (ASV)
command signal circuit (ECM-
AID)



Open in AID ground circuit



Short between diagnostic signal
circuit and body ground



AID



ECM

AIR System: ON (Air

pump OFF, ASV

OFF)

-

Normal



Short between air pump drive
circuit and body ground

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

HINT:



By using the Techstream to perform the Air Injection Check operation in the System Check, the air-fuel
ratio and the pressure in the secondary air injection system passage can be checked while the secondary
air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions.

Air Pump: ON

P0418
P0419



Harness and connector (AID-
Pump) Air pump



AID



ECM

Air Pump: OFF

P0418
P0419



Open in air pump drive circuit
(AID-Pump)



Harness and connector (AID-
Pump)



Air pump



AID



ECM

ASV: ON

P0412
P0415



Short between ASV drive
circuit and body ground



Harness and connector (AID-
ASV)



ASV



AID



ECM

ASV: OFF

P0412
P0415



Open in ASV drive circuit
(AID-ASV)



Harness and connector (AID-
ASV)



AID



ASV



ECM

AIR System: OFF

(Air pump OFF, ASV

OFF)

P1613
P1614



AID



ECM

AIR System: ON (Air

pump ON, ASV ON)

-

Normal

Other than above

(other than 0, 20,40, 80 and

100% duty)

-

P1613
P1614



AID



Open in AID ground circuit

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra