P0150
3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0130,P0132,P0150,P0152,P2195-P2198: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1)
P2198 - Oxygen Sensor Signal Stuck Rich (Bank 2 Sensor 1)
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.
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.
MONITOR DESCRIPTION
The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to a stoichiometric air-fuel ratio. This maximizes the catalytic converter's ability to purify the exhaust gases. The heated oxygen 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 gas. The sensor element is made of platinum coated zirconia and an integrated heating element. The heated oxygen sensor's output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates output voltage between 0.1 V and 0.9 V in response to the oxygen concentration in the exhaust gas. When the front heated oxygen sensor 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 heated oxygen sensor should indicate rich and lean alternately at a regular cycle under the air-fuel ratio feedback control. If the heated oxygen sensor voltage remains at rich or lean for about 15 seconds (x 3 times), the ECM interprets this as a malfunction of the heated oxygen sensor, illuminates the MIL (2 trip detection logic) and sets DTC P0130, 0150, 2195, 2197, 2196 or 2198.
- If the front heated oxygen sensor output voltage exceeds 1.2 V for 10 seconds, the ECM illuminates the MIL (2 trip detection logic) and sets DTC P0132 or 0152.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P0130, P0150, P2195, P2196, P2197 and P2198:
P0132 and P0152:
TYPICAL MALFUNCTION THRESHOLDS
Heated oxygen sensor voltage (P0130 and P0150):
Heated oxygen sensor out of range (P0132 and P0152):
Heated oxygen sensor voltage stuck Lean (P2195 and P2197):
Heated oxygen sensor voltage stuck rich (P2196 and P2198):
COMPONENT OPERATING RANGE
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Start the engine and idle it for 120 seconds or more [B].
- Drive the vehicle at 40 km/h (25 mph) or more for 20 seconds [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Idle the engine for 20 seconds or more [D].
- Perform step [C] and [D] at least 3 times.
- Enter the following menus: Powertrain / Engine / Trouble Codes [E].
- Read the pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P0130, P0132, P0150, P0152, P2195, P2196, P2197 or P2198.
- Check the DTC judgment result.
HINT
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [C] through [E].
- If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSEPCTION 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:
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
- Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
- 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
NOTICE:
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.
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
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
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result:
C -- GO TO DTC CHART Diagnostic Trouble Code Descriptions
B -- READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)
(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine / Data List / O2S B1S1 or O2S B2S1.
(c) Allow the engine to run for 90 seconds at 2,500 rpm.
(d) Read the heated oxygen sensor voltage while the engine is idling.
Standard:
The heated oxygen sensor voltage alternates between below 0.4 V and more than 0.55 V (see the following table).
NG -- INSPECT HEATED OXYGEN SENSOR
OK -- Continue to next step.
3. PERFORM CONFIRMATION DRIVING PATTERN
Refer to the confirmation driving pattern for P0130, P0132, P0150, P0152, P2195, P2196, P2197 and P2198.
NEXT -- Continue to next step.
4. READ OUTPUT DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Enter the following menus: Powertrain / Engine / Trouble Codes.
(f) Read the DTCs.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HEATED OXYGEN SENSOR
5. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the heated oxygen sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
6. INSPECT EFI RELAY
(a) Remove the EFI relay from the engine room No. 2 relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE EFI RELAY
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM)
(a) Disconnect the H9 and H10 sensor connectors.
(b) Disconnect the E2 and E4 ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK AIR INDUCTION SYSTEM
(a) Check the air induction system for vacuum leaks.
OK:
There are no vacuum leaks in air induction system.
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.
9. CHECK FUEL PRESSURE
(a) Check the fuel pressure Testing and Inspection.
NG -- REPAIR OR REPLACE FUEL SYSTEM
OK -- Continue to next step.
10. INSPECT FUEL INJECTOR
(a) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor).
NG -- REPLACE FUEL INJECTOR Service and Repair
OK -- REPLACE HEATED OXYGEN SENSOR
11. READ VALUE USING TECHSTREAM (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)
(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine / Data List / O2S B1S1 or O2S B2S1.
(c) Allow the engine to run at 2,500 rpm for 3 minutes.
(d) Depress the accelerator pedal quickly until the engine rpm reaches 4,000 rpm 3 times.
Result:
B -- READ DTC OUTPUT
A -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Disconnect the H9 and H10 sensor connectors.
(b) Disconnect the E2 and E4 ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- INSPECT HEATED OXYGEN SENSOR
OK -- REPLACE ECM Service and Repair
13. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the H9 and H10 sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE HEATED OXYGEN SENSOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - HEATED OXYGEN SENSOR)
14. READ DTC OUTPUT
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Refer to the confirmation driving pattern for P0130, P0132, P0150, P0152, P2195, P2196, P2197 and P2198.
(f) Enter the following menus: Powertrain / Engine / Trouble Codes.
(g) Read the DTCs.
Result:
B -- CHECK INTERMITTENT PROBLEMS
A -- REPLACE HEATED OXYGEN SENSOR