Toyota Tundra. Manual — part 1407

Case 4:

TYPICAL MALFUNCTION THRESHOLDS - CASE 4

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Refer to DTC P0412 .

INSPECTION PROCEDURE

HINT:

Diagnostic information output by the 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.

AID DIAGNOSTIC SIGNAL WAVEFORMS REFERENCE

Diagnostic signal duty ratio from air injection control driver

0%

Diagnostic signal duty ratio from air injection control driver

100%

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.

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
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.

2008 Toyota Tundra

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

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+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

Air Pump: ON

P0418
P0419



Short between air pump drive
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)



Harness and connector (AID-
Pump)



Air pump



AID



ECM

ASV: ON

P0412



Short between ASV drive
circuit and body ground



Harness and connector (AID-
ASV)

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.



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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1613 OR P1614)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

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

d. Read DTCs.

Result

RESULT REFERENCE

P0415



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

Result

Proceed To

P1613 and/or P1614 are output

A

2008 Toyota Tundra

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

If any DTCs other than P1613 and P1614 are output, troubleshoot those DTCs first.

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A : Go to Next Step

2. CHECK AIR INJECTION CONTROL DRIVER (POWER SOURCE CIRCUIT)

a. Disconnect the D50 or D54 AID connector.

b. Turn the ignition switch to ON.

c. Measure the voltage according to the value(s) in the table below.

Standard voltage

STANDARD VOLTAGE SPECIFICATION

P1613 and/or P1614 and other DTCs are output

B

Tester Connection

Switch Condition

Specified Condition

D50-5 (+B) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)
D54-5 (+B2) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)

2008 Toyota Tundra

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