DTC P2237-00: O2 Sensor Positive Current Control Circuit/Open - Bank 1, Sensor 1 [08/2018 - ]: Procedure

VISUALLY INSPECT ECM CONNECTOR

Perform the ECM connector Inspection.

Inspect the ECM connector pin type.

Result

Result
200 Pin Type
186 Pin Type

Result:

186 Pin Type

See step 13

Result:

200 Pin Type

See step 2

PURPOSE: INSPECT A/F SENSOR CONNECTOR CONDITION

Switch the ignition off.
Disconnect the A/F sensor connector.
Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

Is there any malfunction?

Result

Result
Yes
No

Result:

Yes

See step 12

Result:

See step 3

PURPOSE: INSPECT ECM CONNECTOR CONDITION

Disconnect the ECM connector.
Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

Is there any malfunction?

Result

Result
Yes
No

Result:

Yes

See step 11

Result:

See step 4

PURPOSE: INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT

Verify that the A/F sensor and ECM connectors are disconnected.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C6-4 - C27-82	Always	Below 1 Ω

Result

Result
Yes
No

Result:

See step 10

Result:

Yes

See step 5

PURPOSE: DETERMINE INTEGRITY OF A/F SENSOR

Connect the Techstream to the DLC3.
Start the engine and warm it up completely.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1).

Refer to ON-BOARD DIAGNOSTIC TEST [07/2015 - ]

Powertrain > Engine > Data List

Tester Display
Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1)

Drive the vehicle under the following conditions.
WARNING:
- When the Techstream is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the Techstream using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
- While performing this step, always operate the vehicle in a safe and lawful manner.
- After increasing the engine speed to 3000 rpm, decelerate using engine braking.

Is the displayed PID value as follows?

Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1): 0.25 mA or more

Result

Result
Yes
No

Result:

See step 9

Result:

Yes

See step 6

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

Always reconnect all disconnected connectors.
Clear the DTC from the ECM memory using the Techstream.
Refer to CLEARING DTC [07/2015 - ]

Powertrain > Engine > Clear DTCs

Perform the KOER self test.

Refer to ON-DEMAND SELF-TEST/KEY-ON ENGINE RUNNING SELF-TEST [07/2015 - ]

Powertrain > Engine > Utility

Tester Display
Key-On Engine Running Self-Test

Is the PENDING CODE for this DTC present?

Result

Result
Yes
No

Result:

Yes

See step 8

Result:

See step 7

PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION

Is any other DTC or pending code stored?

Result

Result
Yes
No

Result:

DTC TROUBLESHOOTING COMPLETED.

Result:

Yes

GO TO THE APPLICABLE DTC INSPECTION.

Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2018 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ]

REPEAT THE INSPECTION FROM STEP 2.

If the malfunction recurs, replace the ECM.
Refer to REMOVAL [07/2015 - ]

Go to the next step.

Result

Proceed to
NEXT

Result:

See step 7

REPLACE THE A/F SENSOR.

Refer to REMOVAL [07/2015 - ]

Then go to the next step.

Result

Proceed to
NEXT

Result:

See step 6

REFER TO THE WIRING DIAGRAM AND VERIFY WHETHER OR NOT THERE IS A COMMON CONNECTOR BETWEEN A/F SENSOR TERMINAL C6-4 AND ECM TERMINAL C27-82.

If there is a common connector:

Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
Repair or replace the malfunctioning part.

If there is no common connector:

Repair or replace the wiring harness which has an open circuit.

Go to the next step.

Result

Proceed to
NEXT

Result:

See step 6

REPLACE THE ECM.

Refer to REMOVAL [07/2015 - ]

Go to the next step.

Result

Proceed to
NEXT

Result:

See step 6

REPLACE THE A/F SENSOR.

Refer to REMOVAL [07/2015 - ]

Then go to the next step.

Result

Proceed to
NEXT

Result:

See step 6

PURPOSE: INSPECT A/F SENSOR CONNECTOR CONDITION

Switch the ignition off.
Disconnect the A/F sensor connector.
Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

Is there any malfunction?

Result

Result
Yes
No

Result:

Yes

See step 23

Result:

See step 14

PURPOSE: INSPECT ECM CONNECTOR CONDITION

Disconnect the ECM connector.
Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

Is there any malfunction?

Result

Result
Yes
No

Result:

Yes

See step 22

Result:

See step 15

PURPOSE: INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT

Verify that the A/F sensor and ECM connectors are disconnected.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C35-4 - C28-3	Always	Below 1 Ω

Result

Result
Yes
No

Result:

See step 21

Result:

Yes

See step 16

PURPOSE: DETERMINE INTEGRITY OF A/F SENSOR

Connect the Techstream to the DLC3.
Start the engine and warm it up completely.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1).

Refer to ON-BOARD DIAGNOSTIC TEST [07/2015 - ]

Powertrain > Engine > Data List

Tester Display
Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1)

Drive the vehicle under the following conditions.
WARNING:
- When the Techstream is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the Techstream using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
- While performing this step, always operate the vehicle in a safe and lawful manner.
- After increasing the engine speed to 3000 rpm, decelerate using engine braking.

Is the displayed PID value as follows?

Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 1): 0.25 mA or more

Result

Result
Yes
No

Result:

See step 20

Result:

Yes

See step 17

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

Always reconnect all disconnected connectors.
Clear the DTC from the ECM memory using the Techstream.
Refer to CLEARING DTC [07/2015 - ]

Powertrain > Engine > Clear DTCs

Perform the KOER self test.

Refer to ON-DEMAND SELF-TEST/KEY-ON ENGINE RUNNING SELF-TEST [07/2015 - ]

Powertrain > Engine > Utility

Tester Display
Key-On Engine Running Self-Test

Is the PENDING CODE for this DTC present?

Result

Result
Yes
No

Result:

Yes

See step 19

Result:

See step 18

PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION

Is any other DTC or pending code stored?

Result

Result
Yes
No

Result:

DTC TROUBLESHOOTING COMPLETED.

Result:

Yes

GO TO THE APPLICABLE DTC INSPECTION.

Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2018 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - ]

REPEAT THE INSPECTION FROM STEP 13.

If the malfunction recurs, replace the ECM.
Refer to REMOVAL [07/2015 - ]

Go to the next step.

Result

Proceed to
NEXT

Result:

See step 18

REPLACE THE A/F SENSOR.

Refer to REMOVAL [07/2015 - ]

Then go to the next step.

Result

Proceed to
NEXT

Result:

See step 17

REFER TO THE WIRING DIAGRAM AND VERIFY WHETHER OR NOT THERE IS A COMMON CONNECTOR BETWEEN A/F SENSOR TERMINAL C35-4 AND ECM TERMINAL C28-3.

If there is a common connector:

Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
Repair or replace the malfunctioning part.

If there is no common connector:

Repair or replace the wiring harness which has an open circuit.

Go to the next step.

Result

Proceed to
NEXT

Result:

See step 17

REPAIR OR REPLACE THE CONNECTOR AND/OR TERMINALS.

Then go to the next step.

Result

Proceed to
NEXT

Result:

See step 17

REPAIR OR REPLACE THE CONNECTOR AND/OR TERMINALS.

Then go to the next step.

Result

Proceed to
NEXT

Result:

See step 17