P0141

SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the rear heated oxygen sensor heaters 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 (128) (ECM ground).

ON BOARD DIAGNOSIS LOGIC:

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

NOTE: If "DIAGNOSTIC TROUBLE CODE 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 more than 10.5V.




With Consult
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. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tool
1. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
2. Turn ignition switch "OFF" and wait at least 5 seconds.
3. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
4. Select "MODE 3" with GST.
5. If DTC is detected, go to "DIAGNOSTIC PROCEDURE".
When using GST, "DIAGNOSTIC TROUBLE CODE 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-RO2HL-01:

EC-RO2HL-01 - Connector View:

LEFT BANK

M3,B4,M50,B101,M49,F63,E70,E81 Connector Views:

M1 Connector View:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Check the following.




1. Check resistance between terminals (4) and (1)
Resistance: 2.3 - 4.3 Ohm at 25 °C (77 °F)




2. Check continuity.
If NG, replace the front 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.