Toyota Tundra (2015 year). Manual — part 1972
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
Air-fuel ratio abnormal Air suction
Intake system
connections
Purge VSV system
Brake booster
5 to 9
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
ENGINE SPEED
SUSPECTED AREA
PRIMARY PARTS TO INSPECT
PROCEDURE
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 sensor
Mass air flow meter
60 to 64
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
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection
procedure.
PROCEDURE
1.
CHECK FOR ANY OTHER DTCS OUTPUT
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
A
A
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) 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 to 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
B
GO TO STEP 4
3.
CHECK ENGINE IMMOBILISER SYSTEM
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
A
(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.
OK:
DATA LIST ITEM
RESULT
Immobiliser Communication
ON
Immobiliser Fuel Cut
OFF
Result
RESULT
PROCEED TO
OK
A
NG
B
B
CHECK ENGINE IMMOBILISER SYSTEM
4.
READ FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to 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
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
A
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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