P0159
DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2)DTC P0138 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)
DTC P0139 OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2)
DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2)
DTC P0158 OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 2 SENSOR 2)
DTC P0159 OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 2)
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.
- Cylinder No. 1 is located in the front part of the engine, opposite the transmission.
- 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.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Enabling Conditions (Part 2):
Typical Malfunction Thresholds:
Component Operating Range:
The ECM monitors the HO2S (sensor 2) by checking to make sure:
- The HO2S 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.
- The HO2S 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.
- The sensor's voltage drops to below 0.2 V (extremely Lean status) immediately when the vehicle decelerates and fuel-cut is operating. If the voltage does not drops to below 0.2 V, the ECM determine that the sensor's response feature has deteriorated, illuminates the MIL and sets a DTC.
MONITOR RESULT
Refer to Checking Monitor Status for detailed information. Checking Monitor Status
Wiring Diagram:
Step 1-2:
Step 3-4:
Step 5-7:
Step 8-10:
Step 11:
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 from normal mode to check mode.
c. Warm up the engine until the engine coolant temperature reaches to 75 degrees C (167 degrees F).
d. Drive the vehicle at 60 km/h (38 mph) for 20 seconds.
e. Allow the engine to idle for 10 seconds.
f. Perform steps d. to e. 12 times.
HINT: If a malfunction exists, the MIL is illuminated 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), 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.
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, 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.