Toyota Tundra (2015 year). Manual — part 1131
INSPECTION PROCEDURE
HINT:
These DTCs relate to the Throttle Position (TP) sensor.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
PROCEDURE
1.
READ VALUE USING TECHSTREAM (THROTTLE POSITION)
(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 / Data List / Throttle Position No. 1 and
Throttle Position No. 2.
(e) Check the values displayed on the Techstream.
Result
THROTTLE
POSITION NO. 1
(VTA1)
WHEN
ACCELERATOR
PEDAL RELEASED
THROTTLE
POSITION NO. 2
(VTA2)
WHEN
ACCELERATOR
PEDAL RELEASED
THROTTLE
POSITION NO. 1
(VTA1)
WHEN
ACCELERATOR
PEDAL DEPRESSED
THROTTLE
POSITION NO. 2
(VTA2)
WHEN
ACCELERATOR
PEDAL DEPRESSED
TROUBLE
AREA
PROCEED
TO
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
VC circuit
A
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P0123,...
A
THROTTLE
POSITION NO. 1
(VTA1)
WHEN
ACCELERATOR
PEDAL RELEASED
THROTTLE
POSITION NO. 2
(VTA2)
WHEN
ACCELERATOR
PEDAL RELEASED
THROTTLE
POSITION NO. 1
(VTA1)
WHEN
ACCELERATOR
PEDAL DEPRESSED
THROTTLE
POSITION NO. 2
(VTA2)
WHEN
ACCELERATOR
PEDAL DEPRESSED
TROUBLE
AREA
PROCEED
TO
open
4.5 to 4.98 V
4.5 to 4.98 V
4.5 to 4.98 V
4.5 to 4.98 V
E2 circuit
open
A
0 to 0.2 V,
or 4.5 to 4.98 V
2.1 to 3.1 V
(Fail-safe)
0 to 0.2 V,
or 4.5 to 4.98 V
2.1 to 3.1 V
(Fail-safe)
VTA1 circuit
open or
ground short
A
0.6 to 1.4 V
(Fail-safe)
0 to 0.2 V,
or 4.5 to 4.98 V
0.6 to 1.4 V
(Fail-safe)
0 to 0.2 V,
or 4.5 to 4.98 V
VTA2 circuit
open or
ground short
A
0.5 to 1.1 V
2.1 to 3.1 V
3.2 to 4.8 V
(Not fail-safe)
4.6 to 4.98 V
(Not fail-safe)
TP sensor
circuit normal
B
HINT:
DTC P0121 is stored when the VTA1 and VTA2 output voltages are not consistent with the sensor
characteristics. Therefore, check the freeze frame data when this DTC is stored. Use the following formula
to confirm the relative differences in voltage.
Characteristic Sensor Output:
VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V
VTA1: Throttle Position No. 1
VTA2: Throttle Position No. 2
If DTC P0121 is output, proceed to "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR -
ECM)".
B
GO TO STEP 5
2.
CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P0123,...
OK
(a) Disconnect the throttle with motor body assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
D9-5 (VC) - D74-80 (VCTA)
Always
Below 1 Ω
D9-6 (VTA) - D74-78 (VTA1)
Always
Below 1 Ω
D9-4 (VTA2) - D74-77 (VTA2)
Always
Below 1 Ω
D9-3 (E2) - D74-79 (ETA)
Always
Below 1 Ω
D9-5 (VC) or D74-80 (VCTA) -
Body ground
Always
10 kΩ or higher
D9-6 (VTA) or D74-78 (VTA1) -
Body ground
Always
10 kΩ or higher
D9-4 (VTA2) or D74-77 (VTA2) -
Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
3.
INSPECT ECM (VC VOLTAGE)
(a) Disconnect the throttle with motor body assembly connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table
below.
Standard Voltage:
TESTER CONNECTION SWITCH CONDITION SPECIFIED CONDITION
D9-5 (VC) - D9-3 (E2)
Ignition switch ON
4.5 to 5.5 V
NG
REPLACE ECM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P0123,...
OK
NEXT
4.
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
(a) Replace the throttle with motor body assembly
.
HINT:
Perform "Inspection After Repair" after replacing the throttle with motor body assembly
.
5.
CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear DTCs
.
(e) Start the engine.
(f) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(g) Read the output DTCs.
Result
RESULT
PROCEED TO
P0120, P0121, P0122, P0123, P0220, P0222, P0223 and/or P2135 is output
A
No DTC is output
B
B
END
A
REPLACE ECM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P0123,...
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