Toyota Sequoia (2005). Manual — part 83
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B17411
E2
VC
E8
ECM Connector
–
DIAGNOSTICS
ENGINE
DI–135
329
3
Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a)
Disconnect the T14 throttle control motor and sensor con-
nector.
(b)
Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminals of the E8
ECM connector.
OK:
Standard:
Tester Connection
Specified Condition
VC (E8–23) – E2 (E8–28)
4.5 to 5.5 V
NG
Replace ECM (See page
OK
4
Replace throttle body (See page
Go
5
Check if DTC output recur.
PREPARATION:
(a)
).
(b)
Start the engine.
(c)
Run the engine at idle for 15 seconds or more.
CHECK:
Read the DTC.
RESULT:
Display (DTC Output)
Proceed to
”P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135” are output
again
A
No DTC output
B
B
System is OK.
A
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–
DIAGNOSTICS
ENGINE
DI–137
331
DTC
P0121
Throttle/Pedal Position Sensor/Switch ”A”
Circuit Range/Performance Problem
HINT:
This is the purpose of the ”throttle position sensor”.
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page
.
DTC No.
DTC Detecting Condition
Trouble Area
P0121
Condition (a) continues for 2.0 sec.:
(a) Difference between VTA1 and VTA2 deviates from the
threshold
Throttle control motor and sensor
MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
This sensor includes two signals, VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and
VTA2 is used to detect malfunctions in VTA1. There are several checks that the ECM performs confirm prop-
er operation of the throttle position sensor and VTA1.
There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
If the voltage output difference of the VTA1 and VTA2 deviates from the normal operating range, the ECM
interprets this as a malfunction of the throttle position sensor. The ECM will turn on the MIL and a DTC is
set.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16
°
) by
the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel–cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ”pass” condition is detected and then the ignition switch is turned OFF, the fail–safe operation will stop
and the system will return to normal condition.
MONITOR STRATEGY
Related DTCs
P0121
Throttle position sensor rationality
Required sensors/components
Throttle position sensor
Frequency of operation
Continuous
Duration
2 sec.
MIL operation
Immediate
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
It
Specification
Item
Minimum
Maximum
The monitor will run whenever this DTC is
not present
See page
VTA2 voltage
–
4.6 V
DI3HR–14
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DI–138
–
DIAGNOSTICS
ENGINE
332
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Different between VTA1 and VTA2
|VTA1 – (VTA2
×
0.8 to 1.2)|*
* Corrected by learning value
Less than 0.8 V and more than 1.6 V
INSPECTION PROCEDURE
HINT:
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.
Replace throttle control motor and sensor (See page
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