SFI SYSTEM, Diagnostic DTC:P0130, P0150, P2195, P2196, P2197, P2198

DTC Code	DTC Name
P0130	Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0150	Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 1)
P2195	Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1)
P2196	Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1)
P2197	Oxygen Sensor Signal Stuck Lean (Bank 2 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.

Tech Tips

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.

DTC No.	DTC Detection Condition	Trouble Area
P0130 P0150	Following conditions, (a), (b) and (c), are met (2 trip detection logic): (a) Heated oxygen sensor (sensor 1) voltage remains at 0.4 V or more (stuck in RICH condition) (b) Heated oxygen sensor (sensor 1) voltage remains at below 0.55 V (stuck in LEAN condition) (c) Engine is idling after engine warm-up	Open or short in heated oxygen sensor (sensor 1) circuit Heated oxygen sensor (sensor 1) A/F relay Air induction system Fuel pressure Injector ECM
P2195 P2197	Following conditions, (a) and (b), are met (2 trip detection logic): (a) Heated oxygen sensor (sensor 1) voltage remains at below 0.55 V (stuck in LEAN condition) (b) Engine is idling after engine warm-up	Same as DTC No. P0130, P0150
P2196 P2198	Following conditions, (a) and (b), are met (2 trip detection logic): (a) Heated oxygen sensor (sensor 1) voltage remains at 0.4 V or more (stuck in RICH condition) (b) Engine is idling after engine warm-up	Same as DTC No. P0130, P0150

DTC No.

DTC Detection Condition

Trouble Area

P0130

P0150

Following conditions, (a), (b) and (c), are met (2 trip detection logic):

(a) Heated oxygen sensor (sensor 1) voltage remains at 0.4 V or more (stuck in RICH condition)
(b) Heated oxygen sensor (sensor 1) voltage remains at below 0.55 V (stuck in LEAN condition)
(c) Engine is idling after engine warm-up

Open or short in heated oxygen sensor (sensor 1) circuit
Heated oxygen sensor (sensor 1)
A/F relay
Air induction system
Fuel pressure
Injector
ECM

P2195

P2197

Following conditions, (a) and (b), are met (2 trip detection logic):

(a) Heated oxygen sensor (sensor 1) voltage remains at below 0.55 V (stuck in LEAN condition)
(b) Engine is idling after engine warm-up

Same as DTC No. P0130, P0150

P2196

P2198

Following conditions, (a) and (b), are met (2 trip detection logic):

(a) Heated oxygen sensor (sensor 1) voltage remains at 0.4 V or more (stuck in RICH condition)
(b) Engine is idling after engine warm-up

Same as DTC No. P0130, P0150

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. The ECM illuminates the MIL (2 trip detection logic) and sets a DTC.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

(a) Connect the intelligent tester to the DLC3.
(b) Switch the tester from normal mode to check mode Click here.
(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 the 2 previous steps at least 3 times.

Tech Tips

If a malfunction exists, the MIL will be illuminated on the multi-information display.
(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 intelligent tester, turn the engine switch off after performing steps "c" to "g", and then perform steps "c" to "g" again.

CAUTION / NOTICE / HINT

Tech Tips

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 +24.8% (increase) by the Active Test.

The Active Test procedure enables a technician to check and graph the voltage outputs of the heated oxygen sensors.

Procedure:

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Warm up the engine by running the engine at 2500 rpm for approximately 90 seconds.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.
Perform the Active Test while the engine is idling.
Monitor the output voltages of the HO2 sensors (O2S B1S1 and O2S B1S2 or O2S B2S1 and O2S B2S2) displayed on the tester.

Tech Tips

The Control the Injection Volume operation lowers the fuel injection volume by 12.5% or increases the injection volume by 24.8%.
Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display	Injection Volume	Status	Voltage
O2S B1S1 or O2S B2S1	+24.8%	Rich	More than 0.55 V
O2S B1S1 or O2S B2S1	-12.5%	Lean	Less than 0.4 V
O2S B1S2 or O2S B2S2	+24.8%	Rich	More than 0.5 V
O2S B1S2 or O2S B2S2	-12.5%	Lean	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.

Tech Tips

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.
Bank 1 refers to the bank that includes No. 1 cylinder.
Bank 2 refers to the bank that does not include No. 1 cylinder.
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

CHECK OTHER DTC OUTPUT

Connect the intelligent tester to the DLC3.
Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

Result

Display (DTC output)	Proceed to
P0130, P0150, P2195, P2196, P2197 or P2198	A
P0130, P0150, P2195, P2196, P2197 or P2198 and other DTCs	B

GO TO RELEVANT DTC CHART Click here

READ DATA LIST (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)
1. Connect the intelligent tester to the DLC3.
2. Enter the following menus: Powertrain / Engine / Data List / Primary / O2S B1S1 (or O2S B2S1).
3. Allow the engine to run for 90 seconds at 2500 rpm.
4. Read the heated oxygen sensor voltage while the engine is idling.
  
  OK
  
  The heated oxygen sensor voltage alternates between below 0.4 V and more than 0.55 V (see the following table).
  
  *1 0.55 V
  
  *2 0.4 V
OK
PERFORM CONFIRMATION DRIVING PATTERN Click here

NG

OK
The heated oxygen sensor voltage alternates between below 0.4 V and more than 0.55 V (see the following table).

*1	0.55 V
*2	0.4 V

INSPECT HEATED OXYGEN SENSOR

Disconnect the E56 and E57 sensor connectors.

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

Standard resistance

Tester Connection	Condition	Specified Condition
1 (HT1A) - 2 (+B)	Always	11 to 16 Ω
1 (HT2A) - 2 (+B)	Always	11 to 16 Ω
1 (HT1A) - 4 (E2)	Always	10 kΩ or higher
1 (HT2A) - 4 (E2)	Always	10 kΩ or higher

REPLACE HEATED OXYGEN SENSOR Click here

INSPECT ENGINE ROOM NO. 2 JUNCTION BLOCK (A/F RELAY)

Remove the terminal cover.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
+B - Body ground	Always	11 to 14 V
A/F - Body ground	Engine switch on (IG)	11 to 14 V

REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM)

Disconnect the E56 and E57 sensor connectors.
Disconnect the E1 and E3 ECM connectors.

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

Standard resistance

Tester Connection	Condition	Specified Condition
E56-1 (HT1A) - E3-3 (HT1A)	Always	Below 1 Ω
E56-3 (OX1A) - E3-28 (OX1A)	Always	Below 1 Ω
E57-1 (HT2A) - E3-2 (HT2A)	Always	Below 1 Ω
E57-3 (OX2A) - E3-27 (OX2A)	Always	Below 1 Ω
E56-4 (E2) - E1-28 (E2)	Always	Below 1 Ω
E57-4 (E2) - E1-28 (E2)	Always	Below 1 Ω
E56-1 (HT1A) or E3-3 (HT1A) - Body ground	Always	10 kΩ or higher
E56-3 (OX1A) or E3-28 (OX1A) - Body ground	Always	10 kΩ or higher
E57-1 (HT2A) or E3-2 (HT2A) - Body ground	Always	10 kΩ or higher
E57-3 (OX2A) or E3-27 (OX2A) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK AIR INDUCTION SYSTEM
1. 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 Click here

OK
CHECK FUEL PRESSURE
1. Check the fuel pressure Click here.
NG
REPAIR OR REPLACE FUEL SYSTEM

OK
INSPECT FUEL INJECTOR
1. Check the injector injection [whether fuel volume is high or low, and whether injection pattern is poor] Click here.
OK
REPLACE HEATED OXYGEN SENSOR Click here

NG
REPLACE FUEL INJECTOR Click here
PERFORM CONFIRMATION DRIVING PATTERN

Tech Tips

Clear all DTCs before performing the confirmation driving pattern.

NEXT

OK
There are no vacuum leaks in air induction system.

READ OUTPUT DTC

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

Read the DTC.

Result

Display (DTC output)	Proceed to
P0130, P0150, P2195, P2196, P2197 or P2198	A
No DTC output	B

REPLACE HEATED OXYGEN SENSOR Click here

CHECK FOR INTERMITTENT PROBLEMS Click here