P0141

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

OPERATION:

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




ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 48 (ECM ground).

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 5 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 KPH (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 Generic Scan Tool
1. Start engine and drive vehicle at a speed of more than 70 KPH (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 5 seconds.
4. Start engine and drive vehicle at a speed of more than 70 KPH (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-RRO2/H-01:

EC-RRO2/H-01 - Connector Views:

WIRING DIAGRAM

M1,M2,M3,M4,M5,B1,E71,E72,E73 Connector Views:

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

DIAGNOSTIC PROCEDURE







Component Inspection

Check the following.
1. Check resistance between terminals 2 and 3.
Resistance: 2.3 - 4.3 Ohms at 25 °C (77 °F)
2. Check continuity.
If NG, replace the rear heated oxygen sensor.

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.