Toyota Tundra (2015 year). Manual — part 1221
ENGINE SPEED
SUSPECTED AREA
PRIMARY PARTS TO INSPECT
PROCEDURE
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
Abnormal
combustion
EGR valve assembly
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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
A
*: If the engine stalls immediately after the injection method is switched from port injection to direct injection,
the injector driver may be malfunctioning.
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1.
CHECK FOR ANY OTHER DTCS OUTPUT
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Read the DTCs
.
Result
RESULT
PROCEED TO
Only DTC P1603 and/or P1605 is output
A
DTCs other than P1603 and/or P1605 are output
B
HINT:
If any DTCs other than P1603 or P1605 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
CHECK FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were
present when the DTC was stored
.
OK:
Immobiliser Fuel Cut is OFF.
Result
RESULT
PROCEED TO
Abnormal
A
Normal
B
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
A
OK
B
GO TO STEP 4
3.
CHECK ENGINE IMMOBILISER SYSTEM
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Idle the engine
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Immobiliser Communication
and Immobiliser Fuel Cut.
(e) Check the Data List indication.
Result
DATA LIST ITEM
RESULT
Immobiliser Communication
ON
Immobiliser Fuel Cut
OFF
NG
CHECK ENGINE IMMOBILISER SYSTEM
4.
READ FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were
present when the DTC was stored
.
Result
PROBLEM SYMPTOM
FREEZE FRAME DATA ITEM FOR DTC P1605
SUSPECTED AREA
PROCEED
TO
CLOSED
THROTTLE
POSITION SW
ENGINE
SPEED
TOTAL OF
SHORT FT AND
LONG FT
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
PROBLEM SYMPTOM
FREEZE FRAME DATA ITEM FOR DTC P1605
SUSPECTED AREA
PROCEED
TO
CLOSED
THROTTLE
POSITION SW
ENGINE
SPEED
TOTAL OF
SHORT FT AND
LONG FT
When idling or
decelerating, engine
speed slowly decreases
and engine stalls
All 5 sets of
freeze frame
data are ON
Decreases
slowly*1
All 5 sets of
freeze frame
data are +15%
or more*2
Air suction
Sensor
malfunction
(value from
sensor too lean)
Fuel supply
problem
A
frame data is
-15% or less*3
Sensor malfunction (value
from sensor too rich)
B
All 5 sets of
freeze frame
data are from
-15% to +15%
Intake air volume
insufficient
Ignition timing
incorrect
C
When idling or
decelerating, engine
speed rapidly
decreases and engine
stalls
Decreases
rapidly*1
-
Injection
stoppage,
ignition stoppage
Load from
external parts
D
When accelerating or
driving at constant
speed, engine stalls*4
At least one is
OFF
-
-
Sensor
malfunction
Injection
stoppage,
ignition stoppage
Fuel supply
problem
E
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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