P0133
DTC P0133 OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)DTC P0153 OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
HINT:
- Bank 1 refers to the bank that includes cylinder No. 1.
- Bank 2 refers to the bank that does not include cylinder No. 1.
- Bank 1 includes cylinder No. 1, but bank 2 does not. Cylinder No. 1 is located in the front part of the engine, opposite the transmission.
- Sensor 1 refers to the sensor closest to the engine body.
- Sensor 2 refers to the sensor farthest away from the engine body.
CIRCUIT DESCRIPTION
DTC Detection Condition:
The Heated Oxygen Sensor (HO2S) is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air-fuel mixture must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen concentration in the exhaust gas.
If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is called LEAN. The HO2S voltage drops below 0.45 V, which informs the ECM of the LEAN condition.
If oxygen is not in the exhaust gas, the air-fuel ratio is called RICH. The HO2S voltage increases above 0.45 V, which informs the ECM of the RICH condition.
HINT: The ECM provides a pulse width modulated control circuit to adjust current through the heater. The HO2S heater circuit uses a relay on the +B side of the circuit.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunction Thresholds:
The ECM uses the Heated Oxygen Sensor (HO2S) information to regulate the air-fuel ratio close to a stoichiometric ratio. This maximizes the catalytic converter's ability to purify the exhaust gases. The sensor detects oxygen levels in the exhaust gas and sends this signal to the ECM.
The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element is exposed to the exhaust gases. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The HO2S's output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The HO2S generates waveforms of a voltage between 0 .1 V and 0.9 V in response to the oxygen concentration in the exhaust gas. When the HO2S voltage is 0.45 V or more, the ECM judges that the air-fuel ratio is RICH. When it is 0.45 V or less, the ECM judges that the air-fuel ratio is LEAN. The ECM monitors the response feature of the HO2S. If the response time of the HO2S status change from RICH to LEAN or vice versa becomes longer, the ECM interprets this as a malfunction in the HO2S and sets a DTC.
MONITOR RESULT
Refer to Checking Monitor Status for detailed information. Checking Monitor Status
Wiring Diagram:
Step 1:
Step 2-4:
Step 5-8:
Step 9-10:
INSPECTION PROCEDURE
CONFIRMATION DRIVING PATTERN
a. Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
b. Switch the hand-held tester from the normal mode to the check mode.
c. Allow the engine to idle until the ECT reaches 75 degrees C (167 degrees F).
d. Allow the vehicle to run at 40 km/h (25 mph) or more for 25 seconds or more.
e. Allow the engine to idle for 30 seconds or more.
f. Perform steps (d) to (e) at least 3 times.
g. Allow the engine to 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, you should perform steps (d) to (e).
If you do not have the hand-held tester, turn the ignition switch OFF after performing steps from (c) to (f), then perform steps from (c) to (f) again.
HINT: It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The ACTIVE TEST can determine if the HO2S or other potential trouble areas are malfunctioning or not. The injection volume can be switched to -12.5 % (decrease) or +25 % (increase) by the ACTIVE TEST. The ACTIVE TEST procedure enables a technician to check and graph the voltage outputs of the HO2Ss.
A/F CONTROL Procedure:
a. Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
b. Turn the ignition switch ON.
c. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
d. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
e. Perform the ACTIVE TEST while the engine is idling.
Standard:
The HO2S reacts in accordance with the increase and decrease of injection volume:
+25 % -> RICH output: more than 0.55 V
-12.5 % -> LEAN output: Less than 0.4 V
NOTE:
The HO2S (sensor 1) output has a few seconds of delay and the HO2S (sensor 2) output has a maximum of 20 seconds of delay.
If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded.
HINT: Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was LEAN or RICH, etc. at the time of the malfunction.