P0161

SYSTEM DESCRIPTION
The PCM performs ON/OFF control of the heated oxygen sensor 2 heater (rear) corresponding to the engine speed.

Operation:

CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.

On Board Diagnosis Logic:

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle.

With CONSULT-II
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
3. Stop vehicle and let engine idle for at least 6 seconds.
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
1. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.




2. Stop vehicle and let engine idle for at least 6 seconds.
3. Turn ignition switch "OFF" and wait at least 10 seconds.
4. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
5. Stop vehicle and let engine idle for at least 6 seconds.
6. Select "MODE 3" with GST.
7. If DTC is detected, go to "Diagnostic Procedure" below.
When using GST, "DTC Confirmation Procedure" should be performed twice as much as when using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended.

WIRING DIAGRAM

EC-O2H2B2-01:

EC-O2H2B2-01-Connector View:

BANK 2




PCM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND.

CAUTION: DO NOT USE PCM GROUND TERMINALS WHEN MEASURING INPUT/OUTPUT VOLTAGE. DOING SO MAY RESULT IN DAMAGE TO THE PCM'S TRANSISTOR. USE A GROUND OTHER THAN PCM TERMINALS, SUCH AS THE GROUND.

Diagnostic Procedure Step 1:

Diagnostic Procedure Step 2:

Diagnostic Procedure Step 3:

Diagnostic Procedure Step 4:

Diagnostic Procedure Step 5:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION

HEATED OXYGEN SENSOR 2 HEATER (REAR)
Check the following.




1. Check resistance between terminals 2 and 3.

Resistance: 2.3 - 4.3 Ohm at 25 °C (77 °F)




2. Check continuity.
If NG, replace the heated oxygen sensor 2 (rear).

CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new heated oxygen sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.