DTC P0036 / P0037 / P0038
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0036: HO2S Heater Control Circuit (Sensor 2) HO2S-2 heater drive circuit is open. (3 D/C detection logic) |
•HO2S-2 heater and/or its circuit
•ECM |
|
P0037: HO2S Heater Control Circuit Low (Sensor 2) HO2S-2 heater drive circuit is shorted to ground. (3 D/C detection logic) |
|
|
P0038: HO2S Heater Control Circuit High (Sensor 2) HO2S-2 heater drive circuit is shorted to power supply. (3 D/C detection logic) |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | HO2S-2 heater power supply circuit | 2. | HO2S-2 |
| A1: | HO2S-1 heater power supply circuit | B2: | HO2S-2 signal circuit | 3. | ECM |
| A2: | HO2S-1 signal circuit | B3: | HO2S-2 ground circuit | 4. | Shield wire |
| A3: | HO2S-1 ground circuit | B4: | HO2S-2 heater drive circuit | ||
| A4: | HO2S-1 heater drive circuit | 1. | HO2S-1 |
DTC Confirmation Procedure
NOTE:
Check that the following condition is met in this “DTC Confirmation Procedure”.
•Battery voltage > 8.5 V
1)Run engine at idle speed for 1 min.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
HO2S-2 heater power supply circuit check
1)With ignition “OFF”, disconnect HO2S-2 connector.
2)Check for proper terminal connection to HO2S-2 connector.
3)If connection is OK, set ignition “ON”.
4)Check that voltage between “B1” circuit and ground is battery voltage.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wiring harness.
|
| 3 |
HO2S-2 heater drive circuit check
1)With ignition “OFF”, disconnect “C01” and “E01” connectors from ECM.
2)Check for proper terminal connection to “C01” and “E01” connectors.
3)If connections are OK, check the following points.
•Resistance of “B4” circuit: less than 1 Ω
•Resistance between “B4” circuit and ground: infinity •Resistance between “B4” circuit terminal and other terminal at HO2S-2 connector: infinity •Voltage of “B4” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 4.
|
Repair or replace defective wiring harness.
|
| 4 |
HO2S-2 check
1)Check HO2S-2 heater.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace HO2S-2.
|