Page 1135 of 3115
DI-86
- DIAGNOSTICSENGINE
279 Author: Date:
2004 LAND CRUISER (RM1071U)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 º0.2 V or lessº or VTA1 is º4.8 V or moreºThrottle control motor and sensor
ECM
P0122(a) VTA1 is 0.2 V or less
Throttle control motor and sensor
Short in VTA1 circuit
Open in VC circuit
ECM
P0123(a) VTA1 is 4.8 V or more
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 º0.5 V or lessº or VTA2 is º4.8 V or moreº and
VTA1 is º0.2 V or moreº and VTA1 is º1.8 V or lessº
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 º4.8 V or moreº and
VTA1 is º0.2 V or moreº and VTA1 is º1.8 V or lessº
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 º0.2 V or lessº and VTA2 is º0.5 V or lessºVTA1 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 VTA1 signal as well as the THROTTLE POS #2 for the VTA2 signal.
Reference (Normal condition):
Tester displayAccelerator pedal fully releasedAccelerator pedal fully depressed
THROTTLE POS10 to 24 %66 to 98%
THROTTLE POS #22.1 to 3.1 V4.5 to 5.5 V
Page 1136 of 3115
- DIAGNOSTICSENGINE
DI-87
280 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
(a) There is a specific voltage difference expected 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 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 ºpassº 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
P0120Throttle position sensor (sensor 1) range check
(Fluttering)
P0122Throttle position sensor (sensor 1) range check
(Low voltage)
P0123Throttle position sensor (sensor 1) range check
(High voltage)
Related DTCsP0220Throttle position sensor (sensor 2) range check
(Fluttering)
P0222Throttle position sensor (sensor 2) range check
(Low voltage)
P0223Throttle position sensor (sensor 2) range check
(High voltage)
P2135Throttle position sensor range check (Correla-
tion)
Required sensors/componentsThrottle position sensor
Frequency of operationContinuous
Duration2 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3).
Throttle control motor powerON
Page 1137 of 3115
DI-88
- DIAGNOSTICSENGINE
281 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0120:
VTA1 voltage0.2 V or less or 4.8 V or more (2 sec. or more)
P0122:
VTA1 voltage0.2 V or less (2 sec. or more)
P0123:
VTA1 voltage4.8 V or more (2 sec. or more)
P0220:
VTA2 voltage0.5 V or less or 4.8 V or more (2 sec. or more)
P0222:
VTA2 voltage0.5 V or less (2 sec. or more)
P0223:
Both of the following conditions are met for 2 sec. or more:A and B
A. VTA1 voltage0.2 V or more and 1.8 V or less
B. VTA2 voltage4.8 V or more
P2135:
Different between VTA1 and VTA2 voltage0.02 V or less
Both of the following conditions are met:A and B
A. VTA1 voltage0.2 V or less
B. VTA2 voltage0.5 V or less
COMPONENT OPERATING RANGE
ParameterStandard Value
Throttle position sensor VTA1 voltage0.6 to 3.96 V
Throttle position sensor VTA2 voltage2.25 to 5.0 V
Page 1138 of 3115
A21362
T16
Throttle Control
Motor and Sensor
4
6
1
228
18
31
21
2
3
17 E5ECM
E2
VC
VTA2
VTA1 3
5
(Shielded)L-R
M-
M+
GE01 E5
E5
E5
E7
E7
E7 BR-W 3
BR-W
L-RIf1
If14
Y-B
R-Y
W
R E2
VC
VTA2
VTA
M-
M+
- DIAGNOSTICSENGINE
DI-89
282 Author: Date:
2004 LAND CRUISER (RM1071U)
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 or the OBD II scan tool. 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.
Page 1139 of 3115
DI-90
- DIAGNOSTICSENGINE
283 Author: Date:
2004 LAND CRUISER (RM1071U)
Hand-held tester:
1 Connect hand-held tester, and read the voltage for throttle position sensor data.
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) Enter the following menus: 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 releasedAccelerator pedal depressedTrouble areaProceed toTHROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)THROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)Trouble areaProceed to
0 %0 to 0.2 V0 %0 to 0.2 VVC circuit open
100 %4.5 to 5.5 V100 %4.5 to 5.5 VE2 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 shortA
about 16 %
(Fail safe)0 to 0.2 or 4.5 to 5.5 Vabout 16 %
(Fail safe)0 to 0.2 or 4.5 to 5.5 VVTA2 circuit open or
ground short
10 to 24 %2.15 to 3.05 V64 to 96 %
(Does not fail safe)4.5 to 5.5 V
(Does not fail safe)Throttle position sen-
sor circuit is normalB
B Go to step 5.
A
Page 1140 of 3115
A21022
Throttle Body Connector
VC VTA2VTA
E2 Wire Harness Side
T16
Front View
A21023
VC
E2
E5
ECM Connector
- DIAGNOSTICSENGINE
DI-91
284 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector between ECM and throttle
position sensor.
PREPARATION:
(a) Disconnect the T16 throttle control motor and sensor con-
nector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
VC (T16-5) - VC (E5-18)
VTA (T16-6) - VTA1 (E5-21)Bl 1WVTA2 (T16-4) - VTA2 (E5-31)Below 1 W
E2 (T16-3) - E2 (E5-28)
VC (T16-5) or VC (E5-18) -
Body ground
VTA (T16-6) or VTA1 (E5-21) -
Body ground10 kW or higher
VTA2 (T16-4) or VTA2 (E5-31) -
Body ground
NG Repair or replace harness or connector.
OK
Page 1141 of 3115
A21022
Throttle Body Connector
VC VTA2VTA
E2
T16
Front View Wire Harness Side:
A21038
E2 (-) VC (+)E5ECM Connector
DI-92
- DIAGNOSTICSENGINE
285 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a) Disconnect the T16 throttle control motor and sensor con-
nector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminals of the E5
ECM connector.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
4 Replace throttle body (See page SF-36).
Go
Page 1143 of 3115
A21022
Throttle Body Connector
VC VTA2VTA
E2
T16
Wire Harness Side
Front View
A21023ECM Connector E5
VC
VTA1VTA2
E2
DI-94
- DIAGNOSTICSENGINE
287 Author: Date:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check for open and short in harness and connector between ECM and throttle
position sensor.
PREPARATION:
(a) Disconnect the T16 throttle control motor and sensor con-
nector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
VC (T16-5) - VC (E5-18)
VTA (T16-6) - VTA1 (E5-21)Bl 1WVTA2 (T16-4) - VTA2 (E5-31)Below 1 W
E2 (T16-3) - E2 (E5-28)
VC (T16-5) or VC (E5-18) -
Body ground
VTA (T16-6) or VTA1 (E5-21) -
Body ground10 kW or higher
VTA2 (T16-4) or VTA2 (E5-31) -
Body ground
NG Repair or replace harness or connector.
OK
