Toyota Sequoia (2005). Manual — part 82
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DIAGNOSTICS
ENGINE
DI–131
325
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these
DTCs are not present
See page
Throttle control motor power
ON
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
P0120:
VTA1 voltage
0.2 V or less, or 4.8 V or more
P0122:
VTA1 voltage
0.2 V or less
P0123:
VTA1 voltage
4.8 V or more
P0220:
VTA2 voltage
0.5 V or less, or 4.8 V or more
P0222:
VTA2 voltage
0.5 V or less
P0223:
Both of the following conditions are met for 2 sec. or more:
Condition 1 and 2
1. VTA1 voltage
0.2 to 1.8 V
2. VTA2 voltage
4.8 V or more
P2135:
Different between VTA1 and VTA2 voltage
0.02 V or less
Both of the following conditions are met:
Condition 1 and 2
1. VTA1 voltage
0.2 V or less
2. VTA2 voltage
0.5 V or less
COMPONENT OPERATING RANGE
Parameter
Standard Value
Throttle position sensor VTA1 voltage
0.6 to 3.96 V
Throttle position sensor VTA2 voltage
2.25 to 5.0 V
A19212
T14
Throttle Control Motor
and Position Sensor
4
6
1
2
G–W
G–B
P–L
B–Y
28
23
19
20
4
5
17
E8
P
V
ECM
E2
VC
VTA2
VTA1
3
5
(Shielded)
L–R
M–
M+
GE01
E8
E8
E8
E8
E8
E8
DI–132
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DIAGNOSTICS
ENGINE
326
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs related to different system that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
Read freeze frame data using
the hand−held tester
. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air–fuel ratio was lean or
rich, as well as other data from the time when a malfunction occurred.
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DIAGNOSTICS
ENGINE
DI–133
327
1
Connect hand–held tester, and read the voltage for throttle position sensor data.
PREPARATION:
(a)
Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / THROTTLE POS
and THROTTLE POS #2.
CHECK:
Read voltage value displayed on the hand–held tester.
OK:
RESULT:
Throttle position expressed as percentage and voltage
Accelerator pedal released
Accelerator pedal depressed
Trouble area
Proceed to
THROTTLE POS
(VTA1)
THROTTLE POS #2
(VTA2)
THROTTLE POS
(VTA1)
THROTTLE POS #2
(VTA2)
Trouble area
Proceed to
0 %
0 to 0.2 V
0 %
0 to 0.2 V
VC circuit open
100 %
4.5 to 5.5 V
100 %
4.5 to 5.5 V
E2 circuit open
0 % or 100 %
2.1 to 3.1 V
(Fail safe)
0 % or 100 %
2.1 to 3.1 V
(Fail safe)
VTA1 circuit open or
ground short
A
about 16 %
(Fail safe)
0 to 0.2 or 4.5 to 5.5 V
about 16 %
(Fail safe)
0 to 0.2 or 4.5 to 5.5 V
VTA2 circuit open or
ground short
10 to 24 %
2.15 to 3.05 V
64 to 96 %
(Does not fail safe)
4.5 to 5.5 V
(Does not fail safe)
Throttle position sen-
sor circuit is normal
B
B
Go to step 5.
A
A21022
Throttle Control Motor and Sensor
VC
VTA2
VTA1
E2
Wire Harness Side
T14
Front View
B17412
VC
E2
E8
ECM Connector
VTA2
VTA1
DI–134
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DIAGNOSTICS
ENGINE
328
2
Check for open and short in harness and connector between ECM and throttle
position sensor.
PREPARATION:
(a)
Disconnect the T14 throttle control motor and sensor con-
nector.
(b)
Disconnect the E8 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester Connection
Specified Condition
VC (T14–5) – VC (E8–18)
Below 1
Ω
VTA1 (T14–6) – VTA1 (E8–21)
Below 1
Ω
VTA2 (T14–4) – VTA2 (E8–31)
Below 1
Ω
E2 (T14–3) – E2 (E8–28)
Below 1
Ω
VC (T14–5) or VC (E8–18) –
Body ground
10 k
Ω
or higher
VTA1 (T14–6) or VTA1 (E8–21) –
Body ground
10 k
Ω
or higher
VTA2 (T14–4) or VTA2 (E8–31) –
Body ground
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
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