Toyota Tundra (2015 year). Manual — part 1245
A
RESULT
PROCEED TO
All cylinders are normal
A
One cylinder is abnormal*1
B
All cylinders are abnormal*2, *3
C
HINT:
.
B
REPLACE SPARK PLUG (ABNORMAL CYLINDER)
C
REPLACE SPARK PLUG (ALL CYLINDER)
68.
CONFIRM VEHICLE CONDITION
(a) Confirm the conditions present when the malfunction occurred based on the customer problem analysis.
PROBLEM SYMPTOM
SUSPECTED AREA
PROCEED
TO
When the engine is stopped and a long time has passed, engine
starting trouble occurs*1
Pressure regulator is stuck open
A
When the engine is stopped and approximately 15 to 120 minutes
have passed, engine starting trouble occurs*2
Fuel injector leak
B
When the engine is stopped and approximately 2 to 3 minutes have
passed, engine starting trouble occurs*3
Failure to maintain fuel pressure
by pressure regulator
A
Condition other than above, or there is an inconsistency in the
conditions present when engine starting trouble occurs
-
C*4
HINT:
*1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel
pressure after stopping the engine.
*2: Fuel may be leaking from a fuel injector.
*3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check
the ability to maintain fuel pressure after stopping the engine.
*4: From step 72, perform fuel system troubleshooting A (steps 94 to 101), fuel system troubleshooting B (steps
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A
102 to 104), intake system troubleshooting (steps 105 to 107), and ignition system troubleshooting (steps 108 to
113), in that order.
B
GO TO STEP 70
C
GO TO STEP 72
69.
CHECK FUEL PRESSURE
HINT:
For the fuel pressure inspection, refer to the following procedures
.
(a) Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
RESULT
PROCEED TO
147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)
A*1
Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)
B
HINT:
If the engine cannot be started, check the fuel pressure after cranking the engine.
*1: From step 72, perform fuel system troubleshooting A (steps 94 to 101), fuel system troubleshooting B (steps
102 to 104), intake system troubleshooting (steps 105 to 107), and ignition system troubleshooting (steps 108 to
113), in that order.
A
GO TO STEP 72
B
REPLACE FUEL PRESSURE REGULATOR ASSEMBLY
70.
CHECK FUEL INJECTOR ASSEMBLY
RESULT
PROCEED TO
4000 ppm or higher
A
Less than 4000 ppm
B*1
HINT:
If the concentration is 4000 ppm or higher, a fuel injector may have a sealing problem.
*1: From step 72, perform fuel system troubleshooting A (steps 94 to 101), fuel system troubleshooting B (steps
102 to 104), intake system troubleshooting (steps 105 to 107), and ignition system troubleshooting (steps 108 to
113), in that order.
Perform "Inspection After Repair" after replacing the fuel injector assembly
.
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B
GO TO STEP 72
A
REPLACE FUEL INJECTOR ASSEMBLY
71.
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP / SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, select the [Control the Fuel Pump / Speed] Active Test.
(d) When performing the Active Test, check for fuel leakage from the fuel pipes.
Result
RESULT
PROCEED TO
HINT:
CHECK FUEL PUMP CONTROL SYSTEM
A
REPAIR OR REPLACE FUEL LINE
72.
CHECK MALFUNCTION CONDITION
(a) If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 46, perform fuel
system troubleshooting C (steps 73 to 76).
PERFORMED STEP
TROUBLESHOOTING BY SYSTEM
PROCEDURE
PROCEED TO
Steps 38, 39, 40 and 46
Fuel system troubleshooting C
73 to 76
A
(b) If the malfunction could not be identified during the inspection in step 44, perform ignition system
troubleshooting (steps 77 to 82).
PERFORMED STEP
TROUBLESHOOTING BY SYSTEM
PROCEDURE
PROCEED TO
Step 44
Ignition system troubleshooting
77 to 82
B
(c) If the malfunction could not be identified during the inspection in steps 53, 54, 55, 56 and 57, perform
intake air system troubleshooting (steps 83 to 85). If engine starting trouble still occurs, perform fuel system
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A
OK
troubleshooting A (steps 86 to 93).
PERFORMED STEP
TROUBLESHOOTING BY SYSTEM
PROCEDURE
PROCEED TO
Step 53, 54, 55, 56 and 57
Intake air system troubleshooting
83 to 85
C
Fuel system troubleshooting A
86 to 93
(d) If the malfunction could not be identified during the inspection in steps 58, 59, 60, 61, 64, 65, 67, 68, 69,
70 and 71, perform fuel system troubleshooting A (steps 94 to 101), fuel system troubleshooting B (steps
102 to 104), intake system troubleshooting (steps 105 to 107), and ignition system troubleshooting (steps
108 to 113), in that order.
PERFORMED STEP
TROUBLESHOOTING BY SYSTEM
PROCEDURE PROCEED TO
Steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71
Fuel system troubleshooting A
94 to 101
D
Fuel system troubleshooting B
102 to 104
Intake air system troubleshooting
105 to 107
Ignition system troubleshooting
108 to 113
B
GO TO STEP 77
C
GO TO STEP 83
D
GO TO STEP 94
73.
INSPECT FUEL INJECTOR ASSEMBLY
(a) Inspect the fuel injectors
.
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly
.
NG
REPLACE FUEL INJECTOR ASSEMBLY
74.
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR POWER SOURCE)
(a) Check the harnesses and connectors, referring to Fuel Injector Circuit inspection procedure
.
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