P0037

DTC P0037 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-II Reference Value In Data Monitor Mode:

CONSULT-II Reference Value in Data Monitor Mode

On Board Diagnosis Logic:

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 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 warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start the engine and keep the engine speed between 3,500 rpm and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start the engine and keep the engine speed between 3,500 rpm and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start the engine and keep the engine speed between 3,500 rpm and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Select "MODE 3" with GST.
9. 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-O2H2B1-01:

EC-O2H2B2-01:

Wiring Diagram

Diagnostic Procedure (Step 1):

Diagnostic Procedure (Steps 2 - 5):

Diagnostic Procedure

Component Inspection

HEATED OXYGEN SENSOR 2 HEATER







1. Check resistance between HO2S2 terminals as shown.
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.