Troubleshooting
DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1)CIRCUIT DESCRIPTION
DTC Detection Condition:
The heated oxygen sensor's output voltage changes sharply when the air-fuel ratio is near the ideal stoichio-metric air-fuel ratio. This sensor reaction is useful for detecting the oxygen concentration in the exhaust gas and for providing the ECM with data about what adjustments are necessary for the air-fuel ratio.
If the oxygen concentration in the exhaust gas increases and the heated oxygen sensor voltage is below 0.45 V, the air-fuel ratio is "LEAN". The heated oxygen sensor informs the ECM about the LEAN condition. If the oxygen concentration in the exhaust gas increases and the heated oxygen sensor voltage is about 0.45 V, the air-fuel ratio is "RICH". The heated oxygen sensor informs the ECM about the RICH condition.
HINT: The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated oxygen sensor heater circuit uses a relay on the B+ side of the circuit.
HINT:
- Bank 1 refers to the bank that includes the cylinder No. 1.
- Bank 2 refers to the bank that excludes the cylinder No. 1.
- 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 the hand-held tester.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Condition:
Typical Malfunction Thresholds:
Component Operating Range:
O2S Test Result:
The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio near to the stoichiometric air-fuel ratio. The sensor detects oxygen levels in the exhaust gases and sends this signal to the ECM. This maximizes the catalytic converter's ability to purify the exhaust gases.
The heated oxygen sensor element consists of the platinum coated zirconia and heating element. The inner surface of sensor element is exposed to the outside air, and the outer surface of sensor element is exposed to the exhaust gases. The sensor generates between 0 V and 1 V of the voltage output in response to the oxygen concentration in the exhaust gases. The sensor's output voltage varies suddenly in the vicinity of the stoichiometric air-fuel ratio.
Under normal conditions, the output voltage from the heated oxygen sensor alternates between RICH and LEAN periodically. When the voltage is 0.4 V or less, the air-fuel ratio is judged as LEAN judged as RICH. If the heated oxygen sensor outputs RICH signal (or LEAN signal) constantly, or if the heated oxygen sensor cannot output enough voltage to reach the minimum specification, the ECM interprets this as a malfunction in the heated oxygen sensor and sets a DTC.
Wiring Diagram:
CONFIRMATION DRIVING PATTERN
Confirmation Driving Pattern:
a. Connect the hand-held tester to the DLC3.
b. Switch the hand-held tester from "normal mode" to "check mode".
c. Start the engine and let the engine idle for 120 seconds or more.
d. Drive the vehicle at 25 mph (40 km/h) or more for 40 seconds or more.
e. Let the engine idle for 20 seconds or more. Perform steps (d) and (e) at least 3 times.
f. Let the engine idle for 30 seconds.
HINT: If a malfunction exists, the MIL will be illuminated on the multi information display during step (f).
NOTE: If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you do not have the hand-held tester, turn the ignition switch OFF after performing steps from (c) to (f), and then perform steps from (c) to (f) again.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).
Perform the ACTIVE TEST's A/F CONTROL operation.
HINT: "A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.
1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 rpm for approximately 90 seconds.
4. Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).
RESULT: Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25 % -> rich output: More than 0.5 V
-12.5 % -> lean output: Less than 0.4 V
NOTE: There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).
The A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.
To display the graph, enter the following menus: ACTIVE TEST / A/F CONTROL / USER DATA. Then select O2S B1S1 and O2S B1S2 by pressing YES. Finally, push ENTER and F4.
NOTE: If the vehicle is short of fuel, the air-fuel ratio becomes LEAN. Heated oxygen sensor DTCs will be recorded and the MIL turns on.
Step 1:
Step 2 - 3:
Step 4 - 5:
Step 6 - 9:
Step 10:
HINT:
- 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.
- A heated oxygen sensor (sensor 1) with a high voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to have a rich air-fuel mixture.
- A heated oxygen sensor (sensor 1) with a low voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to have a lean air-fuel mixture.
CHECK FOR INTERMITTENT PROBLEMS
Hand-held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.
a. Clear the DTCs.
b. Change to check mode.
c. Perform a simulation test.
d. Check the connector and terminal.
e. Wiggle the harness and connector.