P0159
3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
DTC P0136 - Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
DTC P0137 - Oxygen Sensor Circuit Low Voltage (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 P0157 - Oxygen Sensor Circuit Low Voltage (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)
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.
MONITOR DESCRIPTION
The ECM monitors the rear Heated Oxygen (HO2) sensor to check for the following malfunctions. If any of the malfunctions are detected, the ECM illuminates the MIL and sets a DTC.
- The HO2 sensor output voltage remains above 0.5 V (rich) or below 0.4 V (lean) while the vehicle is accelerated and decelerated for 4 to 6 minutes.
- The HO2 sensor output voltage remains extremely low, below 0.05 V for a long time period of time while the vehicle is driven.
- The HO2 sensor output voltage remains extremely low, below 0.2 V (extremely lean condition) soon after fuel cut is performed while the vehicle is decelerated. The ECM interprets this as the sensor response having deteriorated.
- The HO2 sensor output voltage exceeds more than 1.2 V for 10 seconds.
- The HO2 sensor output voltage lower than 0.03 V for 90 seconds.
MONITOR STRATEGY
Crack:
Output voltage:
Low voltage:
Out of range:
Voltage during fuel-cut:
TYPICAL ENABLING CONDITIONS
All:
Heated oxygen sensor output voltage (crack):
Heated oxygen sensor output voltage:
Heated oxygen sensor low voltage:
Heated oxygen sensor out of range:
Heated oxygen sensor voltage during fuel cut:
TYPICAL MALFUNCTION THRESHOLDS
Heated oxygen sensor output voltage (crack):
Heated oxygen sensor output voltage:
Heated oxygen sensor low voltage:
Heated oxygen sensor out of range:
Heated oxygen sensor voltage during fuel cut:
COMPONENT OPERATING RANGE
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.
WIRING DIAGRAM
CONFIRMATION DRIVING PATTERN
- (a) Connect the Techstream to the DLC3.
- (b) Switch the tester from normal mode to check mode Check Mode Procedure.
- (c) Allow the engine to idle until the ECT reaches 75°C (167°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) and (e) at least 3 times.
HINT: If a malfunction exists, the MIL will be illuminated.
- (g) Allow the engine to idle for 30 seconds.
NOTE:
If the conditions in this test are not strictly followed, you should perform steps (d) and (e).
If you do not have the Techstream, turn the ignition switch OFF after performing steps (c) and (f), and then perform steps (c) and (f) again.
INSPECTION PROCEDURE
HINT: It is possible that the malfunctioning area can be found using the Active Test Control the Injection Volume to A/F Sensor 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 voltages of the heated oxygen sensors.
- Procedure:
1 Connect the Techstream to the DLC3.
2 Turn the ignition switch ON.
3 Warm up the engine by running the engine at 2500 rpm for approximately 90 seconds.
4 Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
5 Perform the Active Test while the engine is idling.
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
NOTE:
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.
HINT:
- Read freeze frame data using the Techstream. 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.
- Bank 1 includes No. 1 cylinder, but bank 2 does not. The No. 1 cylinder 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.
PROCEDURE
1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0136, P0137, P0138, P0139, P0156, P0157, P0158, P0159)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the DTCs.
Result:
HINT: If any other codes besides P0136, P0137, P0138, P0139, P0156, P0157, P0158 and P0159 are output, perform the troubleshooting for those DTCs first.
D -- GO TO RELEVANT DTC CHART
C -- READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE)
B -- CHECK WIRE HARNESS (HEATED OXYGEN SENSOR (SENSOR 2) - ECM)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE)
(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S2 or O2S B2 S2.
(c) Allow the engine to run at 2500 rpm for 3 minutes.
(d) Depress the accelerator pedal quickly until the engine rpm reaches 4,000 rpm 3 times.
Standard voltage:
The heated oxygen sensor voltage alternates from below 0.4 V to 0.5 V or more.
OK -- PERFORM CONFIRMATION DRIVING PATTERN
NG -- Continue to next step.
3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
(a) Disconnect the H15 and H16 sensor connectors.
(b) Measure the resistance of the sensor.
Standard resistance:
NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
4. INSPECT EFI RELAY (Marking: EFI)
(a) Remove the EFI relay from the engine room No. 2 relay block.
(b) Measure the resistance of the EFI relay.
Standard resistance:
NG -- REPLACE EFI RELAY
OK -- Continue to next step.
5. CHECK WIRE HARNESS (HEATED OXYGEN SENSOR (SENSOR 2) - ECM)
(a) Disconnect the H15 and H16 sensor connectors.
(b) Disconnect the E5 ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE HEATED OXYGEN SENSOR
6. PERFORM CONFIRMATION DRIVING PATTERN
HINT: Clear all DTCs before performing the confirmation driving pattern.
NEXT -- Continue to next step.
7. READ OUTPUT DTC (DTC P0136 OR P0156 IS OUTPUT AGAIN)
(a) Clear the DTC DTC Check / Clear.
(b) Start the engine and allow the engine to idle for 15 seconds or more.
(c) Read the DTCs.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HEATED OXYGEN SENSOR
8. READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE)
(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S2 or O2S B2 S2.
(c) Allow the engine to run at 2500 rpm for 3 minutes.
(d) Depress the accelerator pedal quickly until the engine rpm reaches 4000 rpm 3 times.
Result:
B -- READ OUTPUT DTC (DTC P0138, P0139, P0158 OR P0159 IS OUTPUT AGAIN)
A -- Continue to next step.
9. CHECK WIRE HARNESS (FOR SHORT)
(a) Disconnect the H15 and H16 sensor connectors.
(b) Disconnect the E5 ECM connector.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:
OK -- REPLACE ECM
NG -- Continue to next step.
10. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the H15 and H16 sensor connectors.
(b) Measure the resistance of the sensor.
Standard resistance:
NG -- REPLACE HEATED OXYGEN SENSOR
OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR
11. READ OUTPUT DTC (DTC P0138, P0139, P0158 OR P0159 IS OUTPUT AGAIN)
(a) Clear the DTC DTC Check / Clear.
(b) Start the engine and allow the engine to idle for 15 seconds or more.
(c) Read the DTCs.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HEATED OXYGEN SENSOR