P0038
DTC P0038 HO2S2 HEATERSYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 2 heaters corresponding to the engine speed.
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 5 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 engine and keep the engine speed at between 3,500 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. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
3. Let engine idle for 1 minute.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Select MODE 3 with GST.
8. 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 (Steps 1 - 2):
Diagnostic Procedure (Steps 3 - 6):
Diagnostic Procedure
Component Inspection
HEATED OXYGEN SENSOR 2 HEATER
Check the following.
1. Check resistance between HO2S2 terminals 2 and 3.
Resistance: 2.3 - 4.3 Ohms at 25 °C (77 °F)
2. Check continuity.
3. 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.