Toyota Tundra. Manual — part 1202

Fig. 137: Secondary Air Injection System Wiring Diagram For Bank 2

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 (1GR-FE) - Tundra

ECM COMMANDS CHART

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 repetitively 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
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 Area

Any Secondary Air

Injection (AIR)

System operation

P1613
P1614



Open in diagnostic signal
circuit



Air Injection Control Driver
(AID)



Open in AID +B 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: OFF

(Air pump OFF,

ASV OFF)

-

Normal



Short between air pump drive

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

HINT:

Air Pump: ON

P0418
P0419

circuit and body ground



Harness and connector (AID
- Pump)



Air pump



AID



ECM

Air Pump: OFF

P0418
P0419



Open in air pump drive
circuit (AID - Pump), or
short between air pump drive
circuit and +B



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 (1GR-FE) - Tundra



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.



Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

1. INSPECT AIR SWITCHING VALVE ASSEMBLY

a. Disconnect the D58 or D59 air switching valve (ASV) connector.

b. Measure the resistance according to the value(s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

NG : REPLACE AIR SWITCHING VALVE ASSEMBLY (See AIR SWITCHING VALVE ).

Fig. 138: Identifying D58 Or D59 Air Switching Valve Connector Terminals

OK : Go to next step

2. CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - BODY GROUND)

a. Disconnect the D58 or D59 ASV connector.

b. Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection Condition Specified Condition

5 (+B) - 1 (GND) 20°C (68°F)

4.5 to 5.5 ohms

5 (+BL) -1 (GNDL) 20°C (68°F)

4.5 to 5.5 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra