DTC    P0136    Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)

DTC    P0156    Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2)

для подготовки Нажмите здесь


DESCRIPTION

The heated oxygen sensor 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 air-fuel ratio. The heated oxygen sensor output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The heated oxygen sensor 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 heated oxygen sensor 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 heated oxygen sensor voltage increases above 0.45 V, which informs the ECM of the RICH condition.

A088111E02


DTC No.
DTC Detection Condition
Trouble Area
P0136
P0156
Either of following conditions (a) or (b) is met :
(a) HO2 sensor voltage remains below 0.4 V (lean) or above 0.5 V (rich) while vehicle is repeatedly accelerated and decelerated for 4 minutes or more
(b) HO2 sensor voltage remains below 0.05 V for a long time period
  1. Open or short in heated oxygen sensor (sensor 2) circuit
  2. Heated oxygen sensor (sensor 2)
  3. Heated oxygen sensor (sensor 2) heater
  4. EFI MAIN 2 relay

MONITOR DESCRIPTION

The ECM monitors the heated oxygen sensor (sensor 2) to make sure:
  1. The heated oxygen sensor voltage does not remain RICH (above 0.5 V) or LEAN (below 0.4 V) while the vehicle is accelerating and decelerating for 4 to 8 minutes. If the voltage remains either RICH or LEAN, the ECM interprets this as a malfunction, illuminates the MIL and sets a DTC.
  2. The heated oxygen sensor voltage does not remain at less than 0.05 V for a long time while the vehicle is running. If the voltage remains at less than 0.05 V for a long time, the ECM interprets this as a malfunction, illuminates the MIL and sets a DTC.

WIRING DIAGRAM


A152752E01


CONFIRMATION DRIVING PATTERN


A058686E13

  1. (a) Connect the intelligent tester to the DLC3.
  1. (b) Switch the intelligent tester from normal mode to check mode (see page Нажмите здесь).
  1. (c) Allow the engine to idle until the ECT reaches 75°C (167°F).
  1. (d) Allow the vehicle to run at 60 km/h (38 mph) or more for 20 seconds or more.
  1. (e) Allow the engine to idle for 10 seconds or more.
  1. (f) Perform the 2 previous steps at least 12 times.

УКАЗАНИЕ:
If a malfunction exists, the MIL will be illuminated on the multi-information display.

ПРИМЕЧАНИЕ:
If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you do not have the intelligent tester, turn the engine switch off after performing steps "c" to "f", and then perform steps "c" to "f" again.


INSPECTION PROCEDURE

УКАЗАНИЕ:
It is possible that the malfunctioning area can be found using the Active Test Control operation. The Active Test can determine if the heated oxygen sensor 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 output voltage of the heated oxygen sensors.

  1. Procedure:
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG).
    3. Warm up the engine by running the engine at 2500 rpm for approximately 90 seconds.
    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.
    5. Perform the Active Test while the engine is idling.
    6. Monitor the output voltages of the HO2 sensors (O2S B1 S1 and O2S B1 S2 or O2S B2 S1 and O2S B2 S2) displayed on the tester.

Standard:
The heated oxygen sensor 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

ПРИМЕЧАНИЕ:
The heated oxygen sensor (sensor 1) output has a few seconds of delay and the heated oxygen sensor (sensor 2) output has a maximum of 20 seconds of delay.
If the vehicle is short on fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded.


Case
Front HO2 Sensor (Sensor 1) Output Voltage
Rear HO2 Sensor (Sensor 2) Output Voltage
Main Suspected Trouble Area
1
A150787E01
A150789E01
A150787E01
A150788E01
-
2
A150787E01
A150790E01
A150787E01
A150788E01
  1. Front HO2 sensor
  2. Front HO2 sensor heater
  3. Front HO2 sensor circuit
3
A150787E01
A150789E01
A150787E01
A150790E01
  1. Rear HO2 sensor
  2. Rear HO2 sensor heater
  3. Rear HO2 sensor circuit
4
A150787E01
A150790E01
A150787E01
A150790E01
  1. Injector
  2. Fuel pressure
  3. Gas leakage from exhaust system (Air-fuel ratio extremely rich or lean)

УКАЗАНИЕ:
  1. Read freeze frame data using the intelligent tester. 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.
  1. Bank 1 refers to the bank that includes No. 1 cylinder.
  2. Bank 2 refers to the bank that does not include No. 1 cylinder.
  3. No. 1 cylinder is located in the front part of the engine, opposite the transmission.
  4. Sensor 2 refers to the sensor farthest away from the engine body.

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0136, P0156)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine / DTC.

  1. Read the DTCs.

    Result:

    Display (DTC output)
    		Proceed to
    P0136 or P0156
    		A
    P0136 or P0156 and other DTCs
    		B

    УКАЗАНИЕ:
    If any other codes besides P0136 and P0156 are output, perform the troubleshooting for those DTCs first.



B
GO TO RELEVANT CHART (Нажмите здесь)
A


2.READ DATA LIST (HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE)

  1. Connect the intelligent tester to the DLC3.

  1. Enter the following menus: Powertrain / Engine / Data List / Primary / O2S B1 S2 (or O2S B2 S2).

  1. Allow the engine to run at 2500 rpm for 3 minutes.

  1. Depress the accelerator pedal quickly until the engine rpm reaches 4000 rpm 3 times.

    Standard voltage:
    The heated oxygen sensor voltage alternates from below 0.4 V to 0.5 V or more.



OK
Перейдите к шагу 6
NG


3.INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
A117841E18

  1. Disconnect the L49 and L50 sensor connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (HT1B) - 2 (+B)
    		Always
    		11 to 16 Ω
    1 (HT2B) - 2 (+B)
    		Always
    		11 to 16 Ω
    1 (HT1B) - 4 (E2)
    		Always
    		10 kΩ or higher
    1 (HT2B) - 4 (E2)
    		Always
    		10 kΩ or higher



NG
REPLACE HEATED OXYGEN SENSOR (Нажмите здесь)
OK


4.INSPECT EFI MAIN 2 RELAY
B016200E02

  1. Remove the relay from the engine room No. 2 junction block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Terminal Connections
    		Condition
    		Specified Condition
    3 - 5
    		When no battery voltage is applied to terminals 1 and 2
    		10 kΩ or higher
    When battery voltage is applied to terminals 1 and 2
    		Below 1 Ω



NG
REPLACE EFI MAIN 2 RELAY
OK


5.CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 2) - ECM)
A149672E02

  1. Disconnect the L49 and L50 sensor connectors.

  1. Disconnect the A13 and E1 ECM connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L50-1 (HT1B) - A13-4 (HT1B)
    		Always
    		Below 1 Ω
    L49-1 (HT2B) - A13-3 (HT2B)
    		Always
    		Below 1 Ω
    L50-3 (OX1B) - A13-26 (OX1B)
    		Always
    		Below 1 Ω
    L49-3 (OX2B) - A13-27 (OX2B)
    		Always
    		Below 1 Ω
    L50-4 (E2) - E1-28 (E2)
    		Always
    		Below 1 Ω
    L49-4 (E2) - E1-28 (E2)
    		Always
    		Below 1 Ω
    L50-1 (HT1B) or A13-4 (HT1B) - Body ground
    		Always
    		10 kΩ or higher
    L49-1 (HT2B) or A13-3 (HT2B) - Body ground
    		Always
    		10 kΩ or higher
    L50-3 (OX1B) or A13-26 (OX1B) - Body ground
    		Always
    		10 kΩ or higher
    L49-3 (OX2B) or A13-27 (OX2B) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HEATED OXYGEN SENSOR (Нажмите здесь)  

6.PERFORM CONFIRMATION DRIVING PATTERN

УКАЗАНИЕ:
Clear all DTCs before performing the confirmation driving pattern.


NEXT


7.READ OUTPUT DTC (DTC P0136 OR P0156 IS OUTPUT AGAIN)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the tester ON.

  1. Start the engine and allow the engine to idle for 15 seconds or more.

  1. Enter the following menus: Powertrain / Engine / DTC / Pending Codes.

  1. Read the DTC.

    Result:

    Display (DTC output)
    		Proceed to
    P0136 or P0156
    		A
    No output
    		B



B
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
A

REPLACE HEATED OXYGEN SENSOR (Нажмите здесь)