P0147

SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 3 heater corresponding to the engine speed.

Operation:

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" 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 5 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.

EC-HO2S3H-01:

EC-HO2S3H-01 - Connector View:

WIRING DIAGRAM

ECM Terminals And Reference Value:

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

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

Diagnostic Procedure Steps 1 - 3:

Diagnostic Procedure Steps 4 - 5:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION

HEATED OXYGEN SENSOR 3 HEATER
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 heated oxygen sensor 3.

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-3897-18 or J-43897-12 and approved anti-seize lubricant.