P0038

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Description

SYSTEM DESCRIPTION






The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, amount of intake air and engine coolant temperature.

OPERATION






CONSULT-III Reference Value in Data Monitor Mode






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 between 11 V and 16 V at idle.

1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to "Diagnosis Procedure".

Wiring Diagram

EC-O2H2B1-01:

EC-O2H2B2-01:

Diagnosis Procedure

Step 1-2:

Step 2 (Continued)-5:

Step 5 (Continued)-6:

Component Inspection

HEATED OXYGEN SENSOR 2 HEATER




1. Check resistance between HO2S2 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 oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.