Toyota Tundra (2015 year). Manual — part 1971
troubleshooting and return the vehicle to the customer.
SUSPECTED AREA
Engine vibration occurs and engine stops
Air-fuel ratio abnormal
Engine stops with no engine vibration
Ignition system, injection stoppage, high load from
external parts
Engine can be started with accelerator pedal
depressed
Insufficient air volume
Rough idling after engine started
Air-fuel ratio abnormal, abnormal combustion
Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a
malfunction occurs. This information can be useful when troubleshooting.
.
Using freeze frame data, narrow down the parts to be inspected according to the vehicle conditions at
the time when the malfunction occurred.
P1603:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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.
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.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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
Thermostat
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
Ignition timing
incorrect
Does not
operate as
expected
Knock sensor
Engine coolant
temperature
60 to 64
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
VEHICLE
STATE
ENGINE
SPEED
SUSPECTED AREA
PRIMARY PARTS TO
INSPECT
PROCEDURE
sensor
Mass air flow
meter
Rapidly
decreases
and engine
stalls
Ignition and
injection stops
(electrical system
malfunction)
Power
temporarily cut
Power supply
circuit (fuel
injector assembly,
ignition coil
assembly)
65, 66
External part
malfunctioning
Increase in
load
Air conditioning
system
Electrical load
signal system
Power steering
system
A/T system
Park/neutral
position switch
assembly
67 to 69
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
70 to 73
Ignition and
injection stops
(electrical system
malfunction)
Power
temporarily cut
Power supply
circuit (fuel
injector assembly,
ignition coil
assembly)
74, 75
Fuel supply
problem
Fuel leak, clog
Fuel pump control
circuit
Fuel line
76 to 80
P1605:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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