Toyota Tundra (2015 year). Manual — part 1288

OK

OK

(a) Disconnect the air pump assembly (for bank 1 or bank 2)

connector.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON and turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Air Pump Heater.

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

Standard Voltage

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

D89-1 (APH+) - Body ground

Activate the Air Pump Heater is ON

11 to 14 V

D90-1 (APH+) - Body ground

Activate the Air Pump Heater is ON

11 to 14 V

(f) Reconnect the air pump assembly (for bank 1 or bank 2) connector.

NG

GO TO STEP 4

3.

INSPECT AIR PUMP ASSEMBLY (FOR BANK 1 OR BANK 2) (HEATER RESISTANCE)

(a) Inspect the air pump assembly (for bank 1 or bank 2)

.

NG

REPLACE AIR PUMP ASSEMBLY (FOR BANK 1 OR

BANK 2)

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...

OK

OK

4.

INSPECT AIR PUMP HEATER (AI-HTR) RELAY

NG

REPLACE AIR PUMP HEATER (AI-HTR) RELAY

5.

CHECK AIR PUMP HEATER (AI-HTR) RELAY (POWER SOURCE)

(a) Remove the air pump heater (AI-HTR) relay.

(b) Measure the voltage according to the value(s) in the table

below.

Standard Voltage

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

AI-HTR relay terminal 5 - Body

ground

Always

11 to 14 V

(c) Reinstall the air pump heater (AI-HTR) relay.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (AIR PUMP-AIR PUMP HEATER RELAY, BODY
GROUND)

(a) Remove the air pump heater (AI-HTR) relay.

(b) Disconnect the air pump assembly (for bank 1 or bank 2) connector.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...

OK

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

Standard Resistance

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

AI-HTR relay terminal 3 - D89-1 (APH+)

Always

Below 1 Ω

AI-HTR relay terminal 3 - D90-1 (APH+)

Always

Below 1 Ω

D89-3 (APHG) - Body ground

Always

Below 1 Ω

D90-3 (APHG) - Body ground

Always

Below 1 Ω

AI-HTR relay terminal 3 or D89-1 (APH+) - Body ground

Always

10 kΩ or higher

AI-HTR relay terminal 3 or D90-1 (APH+) - Body ground

Always

10 kΩ or higher

(d) Reinstall the air pump heater relay (AI-HTR).

(e) Reconnect the air pump assembly (for bank 1 or bank 2) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

PERFORM ACTIVE TEST USING TECHSTREAM (SECONDARY AIR INJECTION SYSTEM
OPERATION)

(a) Start the engine and warm it up.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check /

Manual Mode / AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1: OFF,
ASV1: CLOSE, AIR PUMP 2: OFF, ASV2: CLOSE.

HINT:

When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is

performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV
operation can be selected.

(g) Start the engine.

(h) Perform the AIR system intrusive operation while the engine is idling.

(i) Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE)

displayed on the Techstream indicate the conditions shown in the table below.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...

OK

Standard:

TESTER OPERATION

AIR PUMP

ASV

PRESSURE*

AIR PUMP: ON, ASV: OPEN

ON

ON

1.9 kPa or more

AIR PUMP: OFF, ASV: CLOSE

OFF

OFF

Less than 3.0 kPa

*: Average pumping pressure. The pressure should be 1.9 kPa or more when the AIR system operates.

(j) Turn the ignition switch off.

NOTICE:

prohibition (WAIT or ERROR).

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

try again.

GO TO STEP 9

8.

CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2247)

(a) Start the engine and warm it up.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Clear DTCs (if set)

.

(g) Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check /

Automatic Mode.

(h) Start the engine after the Techstream initialization is finished.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...