P0161
P0141 (BANK 1), P0161 (BANK 2) HO(2)S(2) HEATERDescription
System Description:
Operation:
Consult-II Reference Value In Data Monitor Mode:
On Board Diagnosis Logic
Malfunction is detected when the current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range.
(An improper voltage drop signal is sent to ECM through the heated oxygen sensor 2 heater.)
Possible Cause
- Harness or connectors
(The heated oxygen sensor 2 heater circuit is open or shorted.)
- Heated oxygen sensor 2 heater
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 between 11 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.
3. Drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
4. Stop vehicle and let engine idle for at least 6 seconds.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure".
With GST
1. Start engine.
2. 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. Turn ignition switch "OFF" and wait at least 10 seconds.
5. Start engine.
6. Drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes.
7. Stop vehicle and let engine idle for at least 6 seconds.
8. Select "MODE 3" with GST.
9. 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.
Wiring Diagram
EC-O2H2B1-01:
BANK 1
EC-O2H2B2-01:
BANK 2
Step 1:
Step 2 - 6:
Diagnostic Procedure
Component Inspection
HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO(2)S(2) terminals as follows.
2. If NG, replace heated oxygen sensor 2.
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.
Removal and Installation
HEATED OXYGEN SENSOR 2
Refer to "EXHAUST SYSTEM".