Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0120
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DI-37
DIAGNOSTICS - ENGINE
DI21X-03
DTC P0120 Throttle/Pedal Position Sensor/Switch "A"
Circuit Malfunction
CIRCUIT DESCRIPTION
The throttle position sensor is mounted in the throttle body and
Throttle Position ECM
Sensor detects the throttle valve opening angle. When the throttle valve
VC is fully closed, a voltage of approximately 0.7 V is applied to ter-
VTA minal VTA of the ECM. The voltage applied to the terminals VTA
of the ECM increases in proportion to the opening angle of the
E2 throttle valve and becomes approximately 2.7 5.2 V when the
throttle valve is fully opened. the ECM judges the vehicle driving
conditions from these signals input from terminals VTA and
P24296 uses them as one of the conditions for deciding the air-fuel ratio
correction, power increase correction and fuel-cut control etc.
DTC No. DTC Detecting Condition Trouble Area
Condition (a) or (b) continues: S Open or short in throttle position sensor circuit
P0120 (a) VTA 0.1 V S Throttle position sensor
(b) VTA 4.9 V S ECM
HINT:
After confirming DTC P0120, use the OBD II scan tool or TOYOTA hand-held tester to confirm the throttle
valve opening percentage and closed throttle position switch condition.
Throttle valve opening position
expressed as percentage Trouble Area
Throttle valve fully closed Throttle valve fully open
VC line open
0% 0%
VTA line open or short
Approx. 100 % Approx. 100 % E2 line open
2001 SIENNA (RM787U)
Author : Date : 191
DI-38
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
Throttle Position Sensor ECM
J12
5V
J/C 2
1 Y Y E11 VC
B B
23
3 L-W VTA1
E11
18
2 BR W E2
E11
S05019
INSPECTION PROCEDURE
HINT:
S If DTCs P0110, P0115 and P0120 may be open.
S Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel
ratio lean or rich, etc. at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand-held tester, and read throttle valve
opening percentage.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tes-
ter to DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool
or TOYOTA hand-held tester main switch ON.
CHECK:
Read the throttle valve opening percentage.
OK:
FI7052 Throttle valve opening position
Throttle valve
expressed as percentage
Fully open Approx. 75 %
Fully closed Approx. 10 %
OK Check for intermittent problems (See page
DI-3 ).
2001 SIENNA (RM787U)
Author : Date : 192
DI-39
DIAGNOSTICS - ENGINE
NG
2 Check voltage between terminal 1 of wire harness side connector and body
ground.
PREPARATION:
ON
(a) Disconnect the throttle position sensor connector.
1 (+) (b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 (VC) of wire harness side
connector and body ground.
OK:
Voltage: 4.5 - 5.5 V
BE6653
S05338 A00437
NG Go to step 5.
OK
3 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
1 CHECK:
Measure voltage between terminals 1, 3 and 2 of throttle posi-
2 tion sensor.
OK:
3 Terminals Throttle valve Resistance
1 2 2.5 - 5.9 k
S05339
3 2 Fully closed 0.2 - 6.3 k
3 2 Fully open 2.0 - 10.2 k
NG Replace throttle position sensor.
OK
2001 SIENNA (RM787U)
Author : Date : 193
DI-40
DIAGNOSTICS - ENGINE
4 Check voltage between terminals VTA1 and E2 of ECM.
ON PREPARATION:
(a) Remove the glove compartment (See page SF-83 ).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VTA1 and E2 of the ECM
connector.
OK:
VTA1 (+) E2 (-) Throttle valve Voltage
A02021
Fully closed 0.3 - 1.0 V
Fully open 2.7 - 5.2 V
NG Check for open and short in harness and con-
nector between ECM and throttle position sen-
sor (VTA line) (See page IN-31 ).
OK
Check and replace ECM (See page IN-31 ).
5 Check voltage between terminals VC and E2 of ECM.
ON PREPARATION:
(a) Remove the glove compartment (See page SF-83 ).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of the ECM
connector.
OK:
VC (+) E2 (-) Voltage: 4.5 - 5.5 V
A02022
NG Check and replace ECM (See page IN-31 ).
OK
Check for open in harness and connector be-
tween ECM and sensor (VC line) (See page
IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 194
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