sensor LEXUS LS430 2003 Factory Repair Manual

Fig. 10: Identifying Connector Terminals Heated Oxygen Sensor
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INSPECTION
1.INSPECT CHARCOAL CANISTER ASSY
a. Visually check the charcoal canister for cracks or damage.
If cracks or damage are found, replace the canister.

SYSTEM DIAGRAM
Engine control system is determined by the ECM based on signals from various sensors.
Fig. 2: Engine Control
- System Diagram
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ON-VEHICLE INSPECTION
1.INSPECTION THROTTLE BODY
a. Inspect the throttle control motor for operating sound.
1. Turn the ignition switch ON.
2. When turning the accelerator pedal position sensor lever, check the running sound of the
motor. The motor should be running smoothly without friction sounds.
If operation is not as specified, check the throttle control motor, wiring and ECM (see DTC P2118:
THROTTLE ACTUATOR CONTROL MOTOR CURRENT RANGE/PERFORMANCE ).
Fig. 3: Identifying Throttle Body

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b. Inspect the throttle position sensor.

Fig. 4: Connecting Hand-Held Tester DLC3 (1 Of 2)
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1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Turn the ignition switch ON.
3. Check that the MIL does not light up.
4. Check that, under the CURRENT DATA, THROTTLE POS (throttle valve opening percentage) is
within the standard value below.
Standard throttle valve opening percentage: 60% or more
If operation is not as specified, check the throttle position sensor, wiring and ECM (see DTC P0120,
P0122, P0123, P0220, P0222, P0223, P2135: THROTTLE/PEDAL POSITION SENSOR/SWITCH
"A" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW/HIGH
INPUT,THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT,
THROTTLE/PEDAL POSITION SENSOR/SWITCH ).
2.INSPECT ACCELERATOR PEDAL POSITION SENSOR
a. When turning ignition switch ON, check that the voltage of the accelerator pedal position sensor of
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48004f0052005a00110003[

Standard: 0.6 to 1.0 V
If the result is not as specified, replace the accelerator pedal position sensor.
3.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY
Fig. 5: Connecting Hand
-Held Tester DLC3 (2 Of 2)
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a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Start and warm up the engine.
d. Connect the hand-held tester and select VVT from the ACTIVE TEST menu.
e. Check the engine speed when the OCV is operated by the hand-held tester.
OK:
ConditionSpecified Condition
VVT system is OFF (OCV is OFF)Normal engine speed
VVT system is ON (OCV is ON)Rough idle or engine stalled

Fig. 10: Inspecting Throttle Body Assy
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a. Measure the resistance between the terminals.
STANDARD:
If the result is not as specified, replace the throttle body assy.
5.INSPECT ENGINE COOLANT TEMPERATURE SENSOR
Tester ConnectionConditionSpecified Condition
2 (M+) - 1 (M-)20°C (68°F)0.3 to 100 ohms
5 (VC) - 3 (E2)20°C (68°F)1.2 to 3.2 kohms

Fig. 11: Inspecting Engine Coolant Temperature Sensor
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a. Measure the resistance between the terminals.

STANDARD:
If the result is not as specified, replace the sensor.
6.INSPECT KNOCK SENSOR
Fig. 12: Inspecting Knock Sensor

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a. Using an ohmmeter, measure the resistance between the terminals.
Standard: 120 to 280 kohms at 20°C (68°F)
If the result is not as specified, replace the sensor.
7.INSPECT RELAY (Marking: EFI MAIN, C/OPN)
ConditionSpecified Condition
Approx. 20°C (68°F)2.32 to 2.59 kohms
Approx. 80°C (176°F)0.31 to 0.326 kohms

Fig. 18: Exploded View Of Knock Sensor -Engine Control System Components (1 Of 2)
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Fig. 19: Exploded View Of Knock Sensor - Engine Control System Components (2 Of 2)
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