Page 1126 of 3115
A19963
2
1G-B
BR-W
E528 E5 19
THW
E2
E1 R 5V ECM
BR E 2
Engine Coolant Temp. Sensor
3
If1
- DIAGNOSTICSENGINE
DI-77
270 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, and other data from the time the malfunction occurred.
Page 1128 of 3115
A19552
Engine Coolant
Temp. Sensor
2
1THW
E2ECM
E2
- DIAGNOSTICSENGINE
DI-79
272 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the E2 engine coolant temperature (ECT)
sensor connector.
(b) Connect terminals 1 and 2 of the engine coolant tempera-
ture sensor wire harness side connector.
(c) Turn the ignition switch ON.
(d) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /
COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Confirm good connection at sensor. If OK, re-
place engine coolant temperature sensor.
NG
Page 1129 of 3115
A19548
Engine Coolant
Temp. Sensor
ECM
E2 THW
E2 THW
E2
E5
ECM Connector
A19550
Engine Coolant
Temp. Sensor
ECM
2
1
E2 THW E2
DI-80
- DIAGNOSTICSENGINE
273 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the E2 engine coolant temperature sensor
connector.
(b) Connect terminals THW and E2 of the E5 ECM connector.
HINT:
Before checking, do a visual and contact pressure checks for
the ECM connector.
(c) Turn the ignition switch ON.
(d) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /
COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Repair or replace harness or connector.
NG
Confirm good connection at ECM. If OK,
check and replace ECM (See page SF-60).
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the E2 engine coolant temperature sensor
connector.
(b) Turn the ignition switch ON.
(c) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /
COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Replace engine coolant temperature sensor.
NG
Page 1130 of 3115
A19551A19635
ECM Engine Coolant
Temp. Sensor
E2 THW
E5
ECM Connector
- DIAGNOSTICSENGINE
DI-81
274 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Disconnect the E5 ECM connector.
(b) Turn the ignition switch ON.
(c) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /
COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Repair or replace harness or connector.
NG
Replace ECM (See page SF-60).
Page 1131 of 3115
DI-82
- DIAGNOSTICSENGINE
275 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0116 Engine Coolant Temperature Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI-75.
DTC No.DTC Detecting ConditionTrouble Area
P0116
If the engine coolant temperature was 35°C (95°F) or more but
less than 60°C (140°F) when the engine is started, and if
conditions (a) and (b) are met:
(a) Vehicle has accelerated and decelerated.
(b) Engine coolant temperature remains within 3°C (5.4°F) of
the initial engine coolant temperature (2 trip detection logic)
Engine coolant temperature sensorP0116If the engine coolant temperature is more than 60°C (140°F)
when the engine is started and the vehicle has accelerated
and decelerated
If the engine coolant temperature sensor records a tempera-
ture variation below 1°C (1.8°F) successively 6 times (6 trip
detection logic)Engine coolant temperature sensor
MONITOR DESCRIPTION
The ECT (Engine Coolant Temperature) sensor is used to monitor the engine coolant temperature. The ECT
sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When
the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the
resistance drops. The variations in resistance are reflected in the voltage output from the sensor. The ECM
monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sen-
sor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT
sensor and sets a DTC.
Examples:
(1) Upon starting the engine, the ECT is between 35°C (95°F) and 60°C (140°F). If after driving for 250 sec.,
the ECT still remains within 3°C (5.4°F) of the starting temperature, a DTC will be set (2 trip detection logic).
(2) Upon starting the engine, the ECT is over 60°C (140°F). If after driving for 250 sec., the ECT still remains
within 1°C (1.8°F) of the starting temperature, a DTC will be set (6 trip detection logic).
MONITOR STRATEGY
Related DTCsP0116Engine coolant temperature sensor range check
(Stuck)
Main sensors/componentsEngine coolant temperature sensor
Required sensors/componentsRelated sensors/componentsIntake air temperature sensor, Crankshaft
position sensor, Mass air flow meter
Frequency of operationContinuous
Duration250 sec.
MIL operation2 driving cycles (When temperature is fixed between 35C (95F) and 60C (140F))
6 driving cycles (When temperature is fixed at 60C (140F) or more)
Sequence of operationNone
DI1LG-15
Page 1132 of 3115
- DIAGNOSTICSENGINE
DI-83
276 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Case 1 (When temperature is fixed between 35C (95F) and 60C (140F)):
Cumulative idle off period250 sec.-
Speed increase 30 km/h (19 mph) or more10 times-
Engine coolant temperature35C (95F)60C (140F)
Intake air temperature-6.7C (20F)-
Case 2 (When temperature is fixed at 60C (140F) or more):
Engine coolant temperature at engine
start60C (140F)-
Intake air temperature-6.7C (20F)-
Stop and goOnce or more (Stop for 20 sec. or more and accelerate to more than 70 km/h (43 mph)
with in 40 sec.)
Steady driving and stop *Once or more
*: Vehicle is driven by 65 km/h (40 mph) or more for 30 sec. or more and the vehicle speed reaches 70 km/h
(44 mph). The vehicle is decelerated from 65 km/h (40 mph) to 3 km/h (2 mph) or less within 35 sec. and
stopped for 10 sec.
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case1 (When temperature is fixed between 35C (95F) and 60C (140F)):
Change of engine coolant temperature valueLess than 3C (5.4F)
Case2 (When temperature is fixed at 60C (140F) or more):
Change of engine coolant temperature value1C (1.8F) or less
COMPONENT OPERATING RANGE
Standard Value
Engine coolant temperature changes with the actual engine coolant temperature.
INSPECTION PROCEDURE
HINT:
If DTC P0115, P0116, P0117, P0118 and P0125 are output simultaneously, ECT sensor circuit may
be open or shorted. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
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.
Replace engine coolant temperature sensor.
Page 1133 of 3115
DI-84
- DIAGNOSTICSENGINE
277 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0120 Throttle/Pedal Position Sensor/Switch ºAº
Circuit
DTC P0122 Throttle/Pedal Position Sensor/Switch ºAº
Circuit Low Input
DTC P0123 Throttle/Pedal Position Sensor/Switch ºAº
Circuit High Input
DTC P0220 Throttle/Pedal Position Sensor/Switch ºBº
Circuit
DTC P0222 Throttle/Pedal Position Sensor/Switch ºBº
Circuit Low Input
DTC P0223 Throttle/Pedal Position Sensor/Switch ºBº
Circuit High Input
DTC P2135 Throttle/Pedal Position Sensor/Switch
ºAº/ºBº Voltage Correction
HINT:
This is the purpose for the ºthrottle position sensorº.
DIC24-01
Page 1134 of 3115
A19755A21037
Throttle Position Sensor ECM
Magnet
Magnet
IC No.2 IC No.1
VC
VTA1
E2 VTA2Throttle Position Sensor Output Voltage (V)
Fail Safe Angle
*1
Usable Range
Throttle Valve Opening Angle (deg)84 7
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
- DIAGNOSTICSENGINE
DI-85
278 Author: Date:
2004 LAND CRUISER (RM1071U)
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 and 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. Volt-
age applied to VTA1 and VTA2 change between 0V and 5V 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.
