Troubleshooting

DTC P0130 Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1)

CIRCUIT DESCRIPTION

Sensor Cut-Away:

Reference:

The throttle position sensor is mounted in the throttle body and detects the throttle valve opening angle. When the throttle valve is fully closed, the IDL contacts in the throttle position sensor are on, so the voltage at the terminal IDL of the ECM becomes 0 V. At this time, a voltage of approximately 0.3 ~ 0.8 V is applied to terminal VTA of the ECM. When the throttle valve is opened, the IDL contacts go off and thus the power source voltage of approximately 12 V in the ECM is applied to the terminal IDL of the ECM. The voltage applied to the terminal' VTA of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 3.2 ~ 4.9 V when the throttle valve is fully opened The ECM judges the vehicle driving conditions from these signals input from terminals VTA and IDL, and uses them as one of the conditions for deciding the air-fuel ratio correction, power increase correction and fuel-cut control etc.





DETECTING CONDITION

HINT: Sensor 1 refers to the sensor closer to the engine body.
The heated oxygen sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan tool or LEXUS hand-held tester.





WIRING DIAGRAM





CONFIRMATION DRIVING PATTERN
(1) Connect the LEXUS hand-held tester to the DCL3.
(2) Switch the LEXUS hand-held tester from normal mode to check mode.
(3) Start the engine and warm it up with all accessory switches OFF.
(4) Drive the vehicle at 50 ~ 65 km/h (31 ~ 40 mph) for 1 ~ 3 minutes to warm up the heated oxygen sensor.
(5) Let the engine idle for 1 minute.

HINT: If a malfunction exists, the MIL will light up during step (5).

NOTICE: If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a LEXUS hand-held tester, turn the ignition switch OFF after performing steps (3) to (5), them perform steps (3) to (5) again.

Step 1:

Step 2:

Step 3:

INSPECTION PROCEDURE