Toyota Tundra (2015 year). Manual — part 1146

OK

OK

OK

NG

GO TO STEP 18

7.

CHECK FUEL PRESSURE

(a) Check the fuel pressure

.

HINT:

Perform "Inspection After Repair" after repairing or replacing the fuel system

.

NG

REPAIR OR REPLACE FUEL SYSTEM

8.

CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leak.

OK:

No gas leak.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system

.

NG

REPAIR OR REPLACE EXHAUST SYSTEM

9.

CHECK FOR SPARKS AND IGNITION

(a) Perform the spark test

.

OK:

Sparks jump across electrode gap.

HINT:

Perform "Inspection After Repair" after repairing or replacing the ignition system

.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...

OK

OK

OK

NG

REPAIR OR REPLACE IGNITION SYSTEM

10.

INSPECT FUEL INJECTOR (INJECTION AND VOLUME)

(a) Check the injection and volume.

HINT:

Refer to the fuel injector assembly inspection procedure

.

If the injectors malfunction, engine misfire may occur. The misfire count can be read using the
Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Cylinder #1 Misfire
Count (to Cylinder #8 Misfire Count).
Perform "Inspection After Repair" after replacing the fuel injector assembly

.

OK

GO TO STEP 15

NG

REPLACE FUEL INJECTOR

11.

INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

NG

REPLACE AIR FUEL RATIO SENSOR

12.

CHECK TERMINAL VOLTAGE (+B OF AIR FUEL RATIO SENSOR)

NG

GO TO STEP 23

13.

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...

OK

NEXT

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor

.

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor

.

15.

PERFORM CONFIRMATION DRIVING PATTERN

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs

.

(e) Turn the ignition switch off.

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

(g) Start the engine and warm it up.

(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(i) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(j) Read DTCs.

Result

RESULT

PROCEED TO

DTC P0171, P0172, P0174 or P0175 is output

A

DTC is not output

B

B

END

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...

A

16.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

(a) Connect the Techstream to the DLC3.

(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or

higher.

HINT:

When performing the Active Test, make sure the shift lever is in P or N.
The A/C switch and all accessory switches should be off.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step

Position.

HINT:

Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.

OK:

MAP and idling condition change in response to EGR step position as follows.

Standard:

-

EGR STEP POSITION (ACTIVE TEST)

STEP 0

STEP 0 TO 30

Idling

condition

Steady idling

Idling changes from steady to rough idling or engine stalls

MAP

(Data List)

20 to 40 kPa (150 to 300

mmHg)

MAP value is at least 10 kPa (75 mmHg) higher than when EGR

valve is fully closed

OK

GO TO STEP 18

NG

GO TO STEP 17

17.

INSPECT EGR VALVE ASSEMBLY

(a) Remove the EGR valve assembly

.

(b) Check if the EGR valve is stuck open.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...