Toyota Tundra. Manual — part 1379



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 ASV connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Result

RESULT REFERENCE

Fig. 143: Identifying Air Switching Valve Connector Terminal

B : REPLACE AIR SWITCHING VALVE ASSEMBLY . (See VACUUM SWITCHING VALVE
(FOR ACIS) ).

C : REPLACE AIR SWITCHING VALVE ASSEMBLY . (See VACUUM SWITCHING VALVE

Tester Connection

Condition Specified Condition

D58-S (+BL) - D58-1 (GNDL) 20°C (68°F)

4.5 to 5.5 ohms

D59-5 (+B) - D59-1 (GND)

20°C (68°F)

4.5 to 5.5 ohms

Result

Proceed To

OK

A

NG (for Bank 1)

B

NG (for Bank 2)

C

2008 Toyota Tundra

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

(FOR ACIS) ).

A : 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

STANDARD RESISTANCE SPECIFICATION

Fig. 144: Identifying Air Switching Valve Connector Terminal

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

3. CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - AIR INJECTION

CONTROL DRIVER)

a. Disconnect the D58 or D59 ASV connector.

b. Disconnect the D50 or D54 AID connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

D58-1 (GNDL) - Body ground Always

Below 1 ohms

D59-1 (GND) - Body ground

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 145: Identifying Air Switching Valve & Air Injection Control Driver Connector
Terminal

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection

Condition Specified Condition

D58-5 (+BL) - D50-6 (VV)

Always

Below 1 ohms

D59-5 (+B) - D54-6 (VV2)

Always

Below 1 ohms

D58-5 (+BL) or D50-6 (VV) - Body ground Always

1 kohms or higher

D59-5 (+B) or D54-6 (VV2) - Body ground

Always

1 kohms or higher

2008 Toyota Tundra

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

OK : REPLACE AIR INJECTION CONTROL DRIVER . (SeeVACUUM SWITCHING VALVE
(FOR ACIS) ).

DTC P0418 SECONDARY AIR INJECTION SYSTEM CONTROL "A" CIRCUIT; DTC P0419
SECONDARY AIR INJECTION SYSTEM CONTROL "B" CIRCUIT

DESCRIPTION

Refer to DTC P0412 .

DTC DETECTION CONDITION AND TROUBLE AREA

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 air pump malfunction signal to the ECM if either of the following conditions is met:



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



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

DTC

Code

DTC Detection Condition

Trouble Area

P0418
P0419

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] OFF)

b. Diagnostic signal from Air Injection Control Driver

(AID) 20%

c. Battery voltage 8 V or higher



Open in air pump drive
circuit



Air pump



AID



ECM

P0418
P0419

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) 20%

c. Battery voltage 8 V or higher



Short between air pump drive
circuit and body ground



Air pump



AID



ECM

2008 Toyota Tundra

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