Toyota Tundra (2015 year). Manual — part 1220
1:
If the engine stalled when the intake air volume was low (during idling or deceleration), there may be
a decrease in torque due to an incorrect air-fuel ratio, etc.
If the engine stalled when the intake air volume was high (during driving or acceleration), there may
be a major malfunction such as continuous misfire due to ignition stoppage, fuel injection stoppage,
etc. and the torque drops to zero.
2:
If the engine speed decreased slowly, there may have been a decrease in torque due to an air-fuel
ratio that was incorrect (by approximately 20 to 30%), etc.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
If the engine speed decreased rapidly, there may have been a malfunction such as when the engine
misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the
external load increases due to an external part malfunctioning.
3:
If the air-fuel ratio is abnormal, there may have been an intake air leak, sensor malfunction, or fuel
supply problem.
If the vehicle was normal, the air volume may have been insufficient or the ignition timing may have
been incorrect.
P1603 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time
when the malfunction occurred (freeze frame data).
VEHICLE
STATE
ENGINE
SPEED
SUSPECTED AREA
PRIMARY PARTS TO INSPECT
PROCEDURE
Idling or
decelerating
Slowly
decreases
and engine
stalls
Ignition system
abnormal
Igniter
abnormal
Power supply circuit
Ignition coil
assemblies
Spark plug
10, 38, 52
Air-fuel ratio
abnormal
Air suction
Intake system
connections
Purge VSV system
Brake booster
5 to 9
Sensor
malfunction
(value from
sensor too
lean)
Mass air flow meter
Engine coolant
temperature sensor
Air fuel ratio sensor
system
Water inlet with
thermostat
sub-assembly
11 to 23
Sensor
malfunction
(value from
sensor too rich)
39 to 51
Fuel supply
problem
Fuel pump control
circuit
Purge VSV system
Fuel line
ECM
24 to 37
Intake air volume
insufficient
Problem with
air passage
Intake system
connections
Mass air flow meter
Brake booster
PCV valve and hose
Purge VSV system
53 to 55
Excessive valve
overlap
Camshaft timing oil
control valve
56 to 59
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
VEHICLE
STATE
ENGINE
SPEED
SUSPECTED AREA
PRIMARY PARTS TO INSPECT
PROCEDURE
Abnormal
combustion
EGR valve
60, 61
Ignition timing
incorrect
Does not
operate as
expected
Knock sensor
Engine coolant
temperature sensor
Mass air flow meter
62 to 66
Rapidly
decreases
and engine
stalls*
Ignition and
injection stops
(electrical system
malfunction)
Power
temporarily cut
Power supply circuit
(fuel injector
assembly, ignition
coil assembly)
67, 68
External part
malfunctioning
Increase in load
Air conditioning
system
Electrical load signal
system
Power steering
system
A/T system
Park/neutral
position switch
assembly
69 to 81
Accelerating
-
Crankshaft position
sensor or VVT
sensor malfunction
Power
temporarily cut
Check DTCs
1
Mass air flow meter
Foreign matter
adhesion
Mass air flow meter
72 to 75
Ignition and
injection stops
(electrical system
malfunction)
Power
temporarily cut
Power supply circuit
(fuel injector
assembly, ignition
coil assembly)
76, 77
Fuel supply
problem
Fuel leak, clog
Fuel pump control
circuit
Fuel line
78 to 82
*: If the engine stalls immediately after the injection method is switched from port injection to direct injection,
the injector driver may be malfunctioning.
P1605:
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
1:
If the engine speed decreased slowly, there may have been a decrease in torque due to an air-fuel
ratio that was incorrect (by approximately 20 to 30%), etc.
If the engine speed decreased rapidly, there may have been a malfunction such as when the engine
misfires almost continuously due to ignition stoppage, fuel injection stoppage, etc., or when the
external load increases due to an external part malfunctioning.
2:
If the air-fuel ratio is abnormal, there may have been an intake air leak, sensor malfunction, or fuel
supply problem.
If the vehicle was normal, the air volume may have been insufficient or the ignition timing may have
been incorrect.
P1605 inspection flow: Narrow down the parts to be inspected according to the vehicle conditions at the time
when the malfunction occurred (freeze frame data).
ENGINE SPEED
SUSPECTED AREA
PRIMARY PARTS TO INSPECT
PROCEDURE
Slowly
decreases and
engine stalls
Ignition system
abnormal
Igniter abnormal
Power supply circuit
Ignition coil assemblies
Spark plug
10, 38, 52
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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