Toyota Tundra. Manual — part 1565

Fig. 156: Checking VVT Sensor Installation
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to Next Step

4. CHECK EXHAUST CAMSHAFT

a. Check the teeth of the camshaft.

OK: Teeth do not have any cracks or deformation.

NG: REPLACE EXHAUST CAMSHAFT (See DISASSEMBLY )

OK: Go to Next Step

5. REPLACE VVT SENSOR

a. Replace the VVT sensor (see INSTALLATION ).

6. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Clear DTCs (see DTC CHECK/CLEAR ).

e. Start the engine.

f. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

g. Read DTCs.

Result

RESULT REFERENCE

HINT:

If the engine does not start, replace the ECM.

Display (DTC Output)

Proceed to

No output

A

P0365, P0367, P0368, P0390, P0392 or P0393

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

B: REPLACE ECM (See REMOVAL )

A: END

DTC P0412 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "A" CIRCUIT; DTC
P0415 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "B" CIRCUIT

DESCRIPTION

The Secondary Air Injection (AIR) system consists of an air pump, the Air Switching Valve (ASV), a pressure
sensor, the Air Injection Control Driver (AID) and the ECM. For a short time after cold engine starts, the AIR
system pumps secondary air to the exhaust port of the cylinder head to purify the exhaust emissions. The
secondary air is supplied by the air pump and is pumped to the exhaust port through the ASV.

The AID drives the ASV and the air pump according to command signals transmitted by the ECM. The pressure
sensor detects the pressure in the secondary air passage when the AIR system is ON and OFF, and transmits a
pressure signal to the ECM.

The AID is not only equipped to drive the pump and valve, but also with a diagnosis function to detect
malfunctions in the AIR system circuit.

HINT:

As a large current is required to drive the air pump and ASV, an AID is installed to this system.

Fig. 157: Secondary Air Injection System Switching Valve - System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

DTC

DTC Detection Condition

Trouble Area

P0412
P0415

After cold engine starts, all of
following conditions met (1 trip
detection logic):

a. Secondary Air Injection

(AIR) system not operating
(air pump OFF, Air
Switching Valve [ASV]



Open in ASV drive circuit



AID



ASV

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

MONITOR DESCRIPTION

The Air Injection Control Driver (AID) detects open and short circuits according to the voltages of the air pump
terminal (VP) and the Air Switching Valve (ASV) terminal (VV), and transmits diagnostic information as a
signal to the ECM.

For a short time after cold engine starts, the ECM transmits command signals to the AID to drive the air pump
and ASV.

The AID transmits an ASV malfunction signal to the ECM if either of the following conditions is met:



The voltage at the AID terminal relating to the ASV is low despite the AID receiving command signals
from the ECM to drive the ASV.



The voltage at the AID terminal relating to the ASV is high despite the AID receiving no command
signals from the ECM to drive the ASV.

The ECM stores the DTC based on diagnostic signals from the AID.

MONITOR STRATEGY

MONITOR STRATEGY

OFF)

b. Diagnostic signal from Air

Injection Control Driver
(AID) 40%

c. Battery voltage 8 V or more



ECM

P0412
P0415

After cold engine starts, all of
following conditions met (1 trip
detection logic):

a. Secondary Air Injection

(AIR) system operating (air
pump ON, Air Switching
Valve [ASV] ON)

b. Diagnostic signal from Air

Injection Control Driver
(AID) 40%

c. Battery voltage 8 V or more



Short between ASV drive
circuit and body ground



AID



ASV



ECM

Related DTCs

P0412: Secondary air injection system air switching valve circuit
range check (Bank 1)
P0415: Secondary air injection system air switching valve circuit
range check (Bank 2)

Required Sensors/Components
(Main)

Air injection control driver

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

TYPICAL ENABLING CONDITIONS

Case 1:

TYPICAL ENABLING CONDITIONS - CASE 1

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Required Sensors/Components
(Related)

Air switching valve

Frequency of Operation

Once per drive cycle

Duration

3 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

-

Secondary air injection pump

Operating

Secondary air injection switching valve

Operating

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

Monitor runs whenever following DTCs not present

-

Secondary air injection pump

Not operating

Secondary air injection switching valve

Not operating

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

Diagnostic signal duty ratio from air injection control driver

31% or more, and 48% or less

Diagnostic signal duty ratio from air injection
control driver

70% or more, and 90% or less when secondary air
injection system operating.
0% when secondary air injection system not operating.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra