P0141

System Description:

SYSTEM DESCRIPTION
The ECM 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:

ECM Terminals And Reference Value:

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 in between 10.5 V and 16 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".

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".
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.

EC-HO2S2H-01:

EC-HO2S2H-01 Connector View:

Wiring Diagram

Fuse Block - Junction Box (J/B) Terminal Arrangement (B1, E71, E72, E73, M1, M2, M3, M4, M5):

Steps 1 - 3:

Steps 4 - 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 oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.