Toyota Tundra (2015 year). Manual — part 1523
TESTER
DISPLAY
DESCRIPTION
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [D] again.
14.
If no pending DTC is output, perform a universal trip and check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
15.
FAIL-SAFE
throttle actuator, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then
adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in
accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a minimal speed. If
the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
WIRING DIAGRAM
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.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P012...
A
PROCEDURE
1.
READ VALUE USING TECHSTREAM (THROTTLE POSITION)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / ETCS / Throttle Position
No.1 and Throttle Position No.2.
(d) 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
open
A
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
E2 circuit
open
A
0 to 0.2 V,
or 4.5 to 5.0 V
2.1 to 3.1 V
(Fail-safe)
0 to 0.2 V,
or 4.5 to 5.0 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 5.0 V
0.6 to 1.4 V
(Fail-safe)
0 to 0.2 V,
or 4.5 to 5.0 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 5.0 V
(Not fail-safe)
TP sensor
circuit normal
B
HINT:
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)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P012...
OK
OK
(a) Disconnect the D9 throttle body assembly connector.
(b) Disconnect the D74 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 D9 throttle 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
4.
REPLACE THROTTLE BODY ASSEMBLY
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P012...
NEXT
(a) Replace the throttle 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 and turn the Techstream on.
(c) Clear DTCs
.
(d) Start the engine.
(e) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving
Pattern.
(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(g) Read DTCs.
Result
RESULT
PROCEED TO
P0120, P0121, P0122, P0123, P0220, P0222, P0223 and/or P2135 are output
A
No DTC is output
B
B
SYSTEM OK
A
REPLACE ECM
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P012...
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