P0037

P0037, P0038 HO2S2 Heater

Description

SYSTEM 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

Operation:

On Board Diagnosis Logic

P0037-P0038:

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 SDT
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 engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to [P0037, P0038 HO2S2 Heater].

WITH GST
Follow the procedure "WITH SDT" above.

Diagnosis Procedure

Step 1:

Step 2:

Step 3-6:

Component Inspection

HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO2S2 terminals as follows.

Heated Oxygen Sensor 2 Heater:

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 [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant (commercial service tool).