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 1142 of 3115
- DIAGNOSTICSENGINE
DI-93
286 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check if DTC output recur.
PREPARATION:
(a) Clear the DTC (See page DI-3).
(b) Start the engine.
(c) Run the engine at idle for 15 seconds or more.
CHECK:
Read the DTC (See page DI-3).
RESULT:
Display (DTC Output)Proceed to
ºP0120, P0122, P0123, P0220, P0222, P0223 and/or P2135º are output
againA
No DTC outputB
B System is OK.
A
Replace ECM (See page SF-60).
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
Page 1144 of 3115
A21022
Throttle Body Connector
VC VTA2VTA
E2
T16
Front View Wire Harness Side:
A21038
E2 (-) VC (+)E5ECM Connector
- DIAGNOSTICSENGINE
DI-95
288 Author: Date:
2004 LAND CRUISER (RM1071U)
2 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
3 Replace throttle body (See page SF-36).
Go