Toyota Sequoia (2005). Manual — part 81
–
DIAGNOSTICS
ENGINE
DI–127
321
DTC
P0120
Throttle/Pedal Position Sensor/Switch ”A”
Circuit
DTC
P0122
Throttle/Pedal Position Sensor/Switch ”A”
Circuit Low Input
DTC
P0123
Throttle/Pedal Position Sensor/Switch ”A”
Circuit High Input
DTC
P0220
Throttle/Pedal Position Sensor/Switch ”B”
Circuit
DTC
P0222
Throttle/Pedal Position Sensor/Switch ”B”
Circuit Low Input
DTC
P0223
Throttle/Pedal Position Sensor/Switch ”B”
Circuit High Input
DTC
P2135
Throttle/Pedal Position Sensor/Switch
”A”/”B” Voltage Correction
HINT:
This is the purpose for the ”throttle position sensor”.
DID84–01
A19755
A21037
Throttle Position Sensor
ECM
Magnet
Magnet
IC No.2
IC No.1
VC
VTA1
E2
VTA2
Throttle Position Sensor Output V
oltage
(V)
Fail Safe Angle
*1
Usable Range
Throttle Valve Opening Angle (deg)
84
6
0
5
2.60
2.25
0.97
0.69
Throttle Valve Fully Opened
(Throttle Position expressed as percentage
(VTA1) 64 to 96%)
Fail Safe Angle 7
°
(Throttle Position expressed as percentage
(VTA1) about 10 to 24%)
Throttle Valve Fully Closed
(Throttle Position expressed as percentage
(VTA1) 10 to 20%)
*1:
VTA1
VTA2
DI–128
–
DIAGNOSTICS
ENGINE
322
CIRCUIT DESCRIPTION
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
This throttle position sensor is a non–contact type.
The throttle position sensor is mounted on the throttle body. It detects the opening angle of the throttle valve.
This sensor is electronically controlled and uses Hall–effect elements, so that accurate control and reliability
can be obtained. The throttle position sensor has 2 sensor elements / signal outputs: VTA1 and VTA2. VTA1
used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. Voltage applied
to VTA1 and VTA2 change between 0 V and 5 V in proportion to the opening angle of the throttle valve. There
are several checks that the ECM performs to confirm proper operation of the throttle position sensor and
VTA1.
The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA1
and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to
driver inputs.
–
DIAGNOSTICS
ENGINE
DI–129
323
DTC No.
DTC Detection Condition
Condition (a) of DTC P0120, P0122, P0123, P0220, P0222 or P0223 continues
for 2 sec.
(Open or short in the throttle control motor and sensor circuit)
Trouble Area
P0120
Detection conditions for DTCs P0122 and P0123 are not satis-
fied but condition (a) is satisfied
(a) VTA1 is ”0.2 V or less” or VTA1 is ”4.8 V or more”
Open or short in throttle control motor and sensor circuit
Throttle control motor and sensor
ECM
P0122
(a) VTA1 is 0.2 V or less
Short in throttle control motor and sensor circuit
Throttle control motor and sensor
Short in VTA1 circuit
Open in VC circuit
ECM
P0123
(a) VTA1 is 4.8 V or more
Open in throttle control motor and sensor circuit
Throttle control motor and sensor
Open in VTA1 circuit
Open in E2 circuit
VC and VTA1 circuit are short–circuited
ECM
P0220
Detection conditions for DTCs P0222 and P0223 are not satis-
fied but condition (a) is satisfied
(a) VTA2 is ”0.5 V or less” or VTA2 is ”4.8 V or more”
Throttle control motor and sensor
ECM
P0222
(a) VTA2 is 0.5 V or less
Throttle control motor and sensor
Short in VTA2 circuit
Open in VC circuit
ECM
P0223
(a) VTA2 is ”4.8 V or more” and
VTA1 is ”0.2 V or more” and VTA1 is ”1.8 V or less”
Throttle control motor and sensor
Open in VTA2 circuit
Open in E2 circuit
VC and VTA2 circuit are short–circuited
ECM
P2135
Condition (a) continues for 0.5 sec. or more, or
condition (b) continues for 0.4 sec. or more:
(a) Difference between VTA1 and VTA2 is 0.02 V or less
(b) VTA1 is ”0.2 V or less” and VTA2 is ”0.5 V or less”
VTA1 and VTA2 circuit are short–circuited
Throttle control motor and sensor
ECM
HINT:
After confirming DTCs, use the hand–held tester or the OBD II scan tool to confirm the throttle valve
opening percentage and closed throttle position switch condition.
THROTTLE POS means the VTA1 signal and the THROTTLE POS #2 means the VTA2 signal.
Reference (Normal condition):
Tester display
Accelerator pedal fully released
Accelerator pedal fully depressed
THROTTLE POS
10 to 24%
66 to 98%
THROTTLE POS #2
2.1 to 3.1 V
4.5 to 5.5 V
DI–130
–
DIAGNOSTICS
ENGINE
324
MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
(a)
There is an expected specific voltage difference between VTA1 and VTA2 for each throttle opening
angle.
If the difference between VTA1 and VTA2 is incorrect the ECM interprets this as a fault and will set a
DTC.
(b)
VTA1 and VTA2 each have a specific voltage operating range.
If VTA1 or VTA2 is out of the normal operating range the ECM interprets this as a fault and will set a
DTC.
(c)
VTA1 and VTA2 should never be close to the same voltage levels.
If VTA1 is within the range of
±
0.02 V of VTA2 the ECM interprets this as a short circuit in the throttle
position sensor system and will set a DTC.
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
P0120
Throttle position sensor (sensor 1) range check
(Fluttering)
P0122
Throttle position sensor (sensor 1) range check
(Low voltage)
P0123
Throttle position sensor (sensor 1) range check
(High voltage)
Related DTCs
P0220
Throttle position sensor (sensor 2) range check
(Fluttering)
P0222
Throttle position sensor (sensor 2) range check
(Low voltage)
P0223
Throttle position sensor (sensor 2) range check
(High voltage)
P2135
Throttle position sensor range check (Correla-
tion)
Required sensors/components
Throttle position sensor
Frequency of operation
Continuous
Duration
Accelerator pedal ON: 2 sec.
Accelerator pedal OFF: 10 sec.
P2135: 0.5 sec. or 0.4 sec.
MIL operation
Immediate
Sequence of operation
None
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст