DTC P0198 Engine Oil Temperature Sensor "A" Circuit High: Notes
WARNING: This page is about a different variant/trim than selected.
DTC detecting condition:
Immediately at fault recognition
Trouble symptom:
- Hard to start
- Improper idling
- Poor driving performance
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to
OPERATION
, Clear Memory Mode.>, and Inspection Mode <Ref. to
PROCEDURE
, Inspection Mode.>.
Wiring diagram:
Engine Electrical System <Ref. to WIRING DIAGRAM , Engine Electrical System.>
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK CURRENT DATA.
NOTE:
For detailed operation procedures, refer to "Current Data Display For Engine". <Ref. to
SUBARU SELECT MONITOR
.>
|
Is the value of «Oil Temperature » less than -40°C (-40°F)? | Go to step 2. | Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
|
| 2 CHECK FOR POOR CONTACT. Check for poor contact between the ECM and engine oil temperature sensor connectors. |
Is there poor contact of the ECM or engine oil temperature sensor connectors? | Repair the poor contact of ECM or engine oil temperature sensor connector. | Go to step 3. |
3 CHECK HARNESS BETWEEN ECM AND ENGINE OIL TEMPERATURE SENSOR CONNECTOR.
Connector & terminal (E158) No. 34 - (E75) No. 1: (E158) No. 18 - (E75) No. 2: |
Is the resistance less than 1 Ω? | Go to step 4. | Repair the open circuit in the harness between ECM connector and engine oil temperature sensor connector. |
4 CHECK HARNESS BETWEEN ECM AND ENGINE OIL TEMPERATURE SENSOR CONNECTOR.
Connector & terminal (E158) No. 18 (+) - Chassis ground (-): |
Is the voltage 5 V or more? | Repair the short circuit to power in harness between ECM connector and engine oil temperature sensor connector. | Replace the engine oil temperature sensor. <Ref. to OIL TEMPERATURE SENSOR .> |