Toyota Tundra (2015 year). Manual — part 1239

A

B

GO TO STEP 22

21.

CHECK FUEL INJECTOR ASSEMBLY

(a) Inspect the fuel injectors assembly

.

RESULT

PROCEED TO

Abnormal

A

Normal

B

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly

.

B

GO TO STEP 22

A

REPLACE FUEL INJECTOR ASSEMBLY

22.

CHECK THROTTLE WITH MOTOR BODY ASSEMBLY

(a) Check if carbon is in the air flow passage.

RESULT

PROCEED TO

Carbon in passage

A

No carbon present

B

HINT:

Perform "Inspection After Repair" after cleaning or replacing the throttle with motor body assembly

.

B

GO TO STEP 23

A

CLEAN OR REPLACE THROTTLE WITH MOTOR BODY

ASSEMBLY

23.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leak

.

OK:

No leak in intake system.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

OK

HINT:

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

.

NG

REPAIR OR REPLACE INTAKE SYSTEM

24.

PERFORM SIMULATION TEST

(a) Check if the engine can be started.

RESULT

PROCEED TO

Engine can be started

A

Engine cannot be started

B

B

GO TO STEP 25

A

END

25.

CONFIRM PROBLEM SYMPTOM

(a) Confirm the problem symptoms.

HINT:

The problem symptoms below can be determined by reading the freeze frame data.

PROBLEM SYMPTOM

SUSPECTED AREA

PROCEED

TO

The engine does not crank

Battery fully depleted

Starter assembly (includes pinion

gear wear or teeth damage)

Starter system

Engine assembly (excess friction)

Drive plate wear or teeth damage

A

Abnormal cranking speed

Battery fully depleted

Starter assembly

Engine assembly (excess friction,

compression loss)

B

There is no initial combustion (combustion does not occur

even once)*1

Pressure regulator fuel pressure

maintenance

Fuel injector leak

C

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

A

PROBLEM SYMPTOM

SUSPECTED AREA

PROCEED

TO

Fuel leak from fuel line

Fuel pump control system

Fuel pump

Spark plug

Crankshaft position sensor system

Ignition coil system

EGR valve assembly

The engine stalls after starter turnoff (engine stalls

immediately after the first time the engine speed

increases)*2

Intake system connections

Throttle with motor body assembly

Camshaft timing oil control valve

Mass air flow meter system

EGR valve assembly

D

The initial combustion and starter turnoff occur late*3

Engine coolant temperature sensor

Mass air flow meter

Air fuel ratio sensor

Heated oxygen sensor

Fuel injector assembly

Spark plug

Pressure regulator

Fuel pump

Fuel pump control system

E

HINT:

If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial
cranking period, the battery charge may be insufficient or the starter may be malfunctioning.
*1: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be
malfunctioning.
*2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the camshaft timing oil control
valve may have a problem returning.
*3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or
too high).

B

GO TO STEP 32

C

GO TO STEP 35

D

GO TO STEP 49

E

GO TO STEP 58

26.

PERFORM SIMULATION TEST

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...

A

(a) When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check

that the starter pinion gear is not spinning freely.

PROBLEM SYMPTOM

SUSPECTED AREA

PROCEED

TO

A noise indicating that the starter pinion gear is extending is heard and the

starter pinion gear is not spinning freely.*1

Battery

Excess engine

friction

Starter assembly

A

A noise indicating that the starter pinion gear is extending is heard but the

starter pinion gear is spinning freely.

Drive plate

Starter assembly

B

A noise indicating that the starter pinion gear is extending is not heard

Battery

Starter assembly

Starter system

C

HINT:

*1: The battery may be fully depleted or there may be excess engine friction.

B

GO TO STEP 29

C

GO TO STEP 30

27.

INSPECT BATTERY

(a) Check the electrolyte quantity.

Standard:

Electrolyte quantity is within the specified range.

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Startabi...