P0198
DTC P0198 ENGINE OIL TEMP.SENSOR HIGH INPUT COMPONENT LOCATIONComponent Location:
GENERAL DESCRIPTION
The fluid of the CVVT is the engine oil and its density changes according to the engine oil temperature. At this time the Oil Temperature Sensor (OTS) helps compensation against the temperature differences. The Oil Temperature Sensor measures the engine oil temperature before the engine oil comes into the Oil-flow Control Valve (OCV). According to the measured temperature, the Engine Control Module (PCM) compensates the oil-flow control valve operation time.
DTC DESCRIPTION
PCM sets DTC P0198 if the PCM detects signal voltage higher than the possible range of a properly operating OTS.
DTC Detecting Condition:
Specification:
Schematic Diagram:
Signal Waveform:
MONITOR DTC STATUS
NOTE: If any codes relating OTS are stored, do ALL REPAIRS associated with those codes before proceeding with further troubleshooting.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History(Not Present) fault"?
NOTE:
1. History (Not Present) fault: DTC occurred but has been cleared.
2. Present fault: DTC is occurring at present time.
YES: Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for loose or poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to next step as below.
MONITOR SCANTOOL DATA
1. Ignition "ON" & Engine "OFF"
2. Disconnect OTS connector
3. Connect Scantool and monitor the "OIL TEMP SENSOR(V)" parameter on the Scantool data list.
4. Jumpe the terminals 1 and 2 of the sensor harness connector together.
Specification : Approx. 0 V
5. Is OTS parameter near the specified value.?
YES: Possibility of sensor malfunction. Go to "Component Inspection" procedure.
NO: Go to next step as below.
6. Jumper the terminal 2 of the OTS harness connector to chassis ground.
7. Observe the "OIL TEMP SENSOR" parameter on the Scantool.
Specification : Approx. 0 V
YES: Possibility of open in OTS ground circuit. Go to "Ground Circuit Inspection" procedure.
NO: Possibility of open or short to battery in OTS signal circuit. Go to "Signal Circuit Inspection" procedure.
GROUND CIRCUIT INSPECTION
1. Ignition "OFF"
2. Disconnect PCM connector.
3. Measure resistance between terminals 1 of the OTS harness connector and 76 of the PCM harness connector.
Specification : Approx. 0 ohms
4. Is resistance within the specification?
YES: Go to Terminal and Connector Inspection" procedure.
NO: Repair open circuit and go to "Verification of Vehicle Repair" procedure
SIGNAL CIRCUIT INSPECTION
1. Check for open in signal circuit.
1. Ignition "OFF"
2. Measure resistance between terminals 2 of the OTS harness connector and 52 of the PCM harness connector.
Specification Approx. 0 ohms
3. Is resistance within specification?
YES: Go to next step as below.
NO: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to battery in signal circuit.
1. Disconnected PCM connector.
2. Ignition "ON" & Engine "OFF".
3. Measure voltage between terminals 2 of the OTS harness connector and 52 of the PCM harness connector.
Specification : Approx. 0 V
4. Is voltage within specification?
YES: Go to "Terminal and Connector Inspection" procedure.
NO: Repair short to battery in harness and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO: Go to "Component Inspection" procedure
COMPONENT INSPECTION
1. Ignition "OFF"
2. Disconnect OTS connector.
3. Measure resistance between terminals 1 and 2 of OTS connector.(Component side)
Specification:
4. Is sensor switching properly?
YES: Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Check OTS for contamination, deterioration, or damage. Substitute with a known-good OTS and check for proper operation. If the problem is corrected, replace OTS and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?
YES: System performing to specification at this time. Clear the DTC.
NO: Go to the applicable troubleshooting procedure.