Toyota Fortuner. Dtc P0130/21 Oxygen Sensor Circuit (Bank 1 Sensor 1)

The front Heated Oxygen (HO2) sensor monitors the oxygen concentration in the exhaust gas. For optimum three-way catalytic converter operation, the air-fuel mixture must be maintained as close as possible to the stoichiometric ratio. The HO2 sensor output voltage changes dramatically in the vicinity of the stoichiometric ratio. By making adjustments in accordance with these signal voltages, the ECM adjusts the fuel injection time so that the air-fuel ratio remains close to stoichiometric levels.
If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is lean and the HO2 sensor output voltage to the ECM drops below 0.45 V. If the oxygen concentration in the exhaust gas decreases, the air-fuel ratio is rich and the HO2 sensor output voltage to the ECM increases to above 0.45 V.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.
Dtc
P0130/21 Oxygen Sensor Circuit (Bank 1 Sensor 1)

DTC No.	DTC Detection Condition	Trouble Area
P0130/21	Heated oxygen sensor output voltage is less than 0.45 V for 75 seconds or more	Open or short in heated oxygen sensor (sensor 1) circuit Heated oxygen sensor (sensor 1) ECM

HINT:

The internal resistance of the heated oxygen sensor (sensor 1) cannot be measured using a tester.
Sensor 1 refers to the sensor closer to the engine assembly.
The output voltage of the heated oxygen sensor and the short-term fuel trim value can be read using the intelligent tester.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

(a) Connect the intelligent tester to the DLC3.
(b) Change the intelligent tester from the normal mode to the check (test) mode (Toyota Fortuner RM000000ZPX007X.html).
(c) Start the engine and let the engine idle for 100 seconds or more.
(d) Drive the vehicle at 40 km/h (25 mph) or more for 20 seconds or more.
(e) Let the engine idle for 20 seconds or more.
(f) Perform steps (d) to (e) 3 times.
(g) Let the engine idle for 30 seconds or more.

HINT:

If a malfunction exists, the MIL will illuminate during step (g).

NOTICE:

If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have an intelligent tester, turn the ignition switch OFF after performing steps (c) to (e), and then perform steps (c) to (e) again.

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

When using intelligent tester:

1.CHECK OTHER DTC OUTPUT

Connect the intelligent tester to the DLC3.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.
Result:
DTC
Proceed to
Only P0130/21 is output
A
Other DTCs are output besides P0130/21
B
HINT:
If any other codes besides P0130/21 are output, perform troubleshooting on those codes first.

GO TO RELEVANT DTC CHART

A

2.READ VALUE USING DATA LIST (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

Connect the intelligent tester to the DLC3.

Start the engine and turn the intelligent tester ON.

Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S1.

Warm up the heated oxygen sensor at an engine speed of 2,500 rpm for approximately 90 seconds.

Read the output voltage of the heated oxygen sensor during engine idling.
Standard:
Fluctuates between less than 0.4 V and more than 0.6 V (see the following figure).

Go to step 10

NG

3.CHECK PCV HOSE

OK:: PCV hose is connected correctly, and is not damaged.

CONNECT HOSE SECURELY OR REPLACE PCV HOSE

OK

4.INSPECT HEATED OXYGEN SENSOR

Disconnect the H9 sensor connector.

Measure the resistance of the sensor.
Standard resistance:
Tester Connection
Condition
Specified Condition
1 (HT1A) - 2 (+B)
20°C (68°F)
5 to 10 Ω
1 (HT1A) - 4 (E2)
-
10 kΩ or higher

REPLACE HEATED OXYGEN SENSOR

OK

5.INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY)

Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

Measure the voltage of the MAIN relay.
Standard voltage:
Tester Connection
Condition
Specified Condition
1J-5 - Body ground
Ignition switch ON
10 to 14 V

REPLACE INTEGRATION NO.1 RELAY

OK

6.CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

Disconnect the H9 heated oxygen sensor connector.

Disconnect the E11 ECM connector.

Measure the resistance of the wire harness side connectors.
Standard resistance:
Tester Connection
Specified Condition
H9-1 (HT1A) - E11-1 (HT1A)
H9-3 (OX1A) - E11-21 (OX1A)
Below 1 Ω
H9-1 (HT1A) or E11-1 (HT1A) - Body ground
H9-3 (OX1A) or E11-21 (OX1A) - Body ground
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.CHECK AIR INDUCTION SYSTEM

Check the air induction system for vacuum leakage.
OK:
No leakage from air induction system.

REPAIR OR REPLACE AIR INDUCTION SYSTEM

OK

8.CHECK FUEL PRESSURE

Check the fuel pressure (Toyota Fortuner RM000000YL7009X_01_0002.html).

REPAIR OR REPLACE FUEL SYSTEM

OK

9.INSPECT FUEL INJECTOR ASSEMBLY

Check the fuel injector (Toyota Fortuner RM000000YL9005X.html).

REPLACE FUEL INJECTOR ASSEMBLY

REPLACE HEATED OXYGEN SENSOR

10.PERFORM CONFIRMATION DRIVING PATTERN

HINT:

Clear all DTCs prior to performing the confirmation driving pattern.

NEXT

11.READ OUTPUT DTC

Read the DTC using the intelligent tester.
Result:
DTC
Proceed to
Only P0130/21 is output
A
Other DTCs are output besides P0130/21
B

CHECK FOR INTERMITTENT PROBLEMS

REPLACE HEATED OXYGEN SENSOR

When not using intelligent tester:

1.CHECK OTHER DTC OUTPUT

Result:

DTC	Proceed to
Only P0130/21 is output	A
Other DTCs are output besides P0130/21	B

HINT:

If any other codes besides P0130/21 are output, perform troubleshooting on those codes first.

GO TO RELEVANT DTC CHART

A

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

Disconnect the H9 heated oxygen sensor connector.

Disconnect the E11 ECM connector.

Measure the resistance of the wire harness side connectors.
Standard resistance:
Tester Connection
Specified Condition
H9-1 (HT1A) - E11-1 (HT1A)
H9-3 (OX1A) - E11-21 (OX1A)
Below 1 Ω
H9-1 (HT1A) or E11-1 (HT1A) - Body ground
H9-3 (OX1A) or E11-21 (OX1A) - Body ground
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE HEATED OXYGEN SENSOR

Tester Connection	Condition	Specified Condition
1 (HT1A) - 2 (+B)	20°C (68°F)	5 to 10 Ω
1 (HT1A) - 4 (E2)	-	10 kΩ or higher

Tester Connection	Specified Condition
H9-1 (HT1A) - E11-1 (HT1A) H9-3 (OX1A) - E11-21 (OX1A)	Below 1 Ω
H9-1 (HT1A) or E11-1 (HT1A) - Body ground H9-3 (OX1A) or E11-21 (OX1A) - Body ground	10 kΩ or higher