4.
Read "DTC Status" parameter.
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.
PCM sets DTC P0197 if the PCM detects signal voltage lower than the possible range of a properly operating OTS.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Voltage range check | ● Short circuit to ground ● Contact resistance in connectors ● Faulty OTS |
Enable Condition | ● Engine coolant temperature ＜ 100°C(212°F) | |
Threshold Value | ● Oil temperature > 154°C(309°F) | |
Diagnostic Time | ● 5 seconds |
Temp.(°C) | Temp.(°F) | Resistance(kΩ) | Temp.(°C) | Temp.(°F) | Resistance(kΩ) |
-20 | -4 | 16.52 | 40 | 104 | 1.11 |
0 | 32 | 6.00 | 60 | 140 | 0.54 |
20 | 68 | 2.45 | 80 | 176 | 0.29 |
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) to select DTC information from the DTCs menu.
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
History (Not Present) fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
▶ Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM 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.
▶ Go to "Monitor Scantool Data" procedure.
Ignition "ON" & Engine "OFF"
Disconnect OTS connector
Connect Scantool and monitor the "OIL TEMP. SENSOR(V)" parameter on the Scantool data list.
Specification : Approx. 5V
Is OTS parameter near the specified value.?
▶ Possibility of sensor malfunction. Go to "Component Inspection" procedure.
▶ Possibility of signal circuit short to ground. Go to next step as below.
Ignition "OFF"
Disconnect OTS connector.
Measure resistance between terminal 2 of the sensor harness connector and chassis ground.
Specification : Infinite
Is resistance within the specification?
▶ Go to "Terminal and Connector Inspection" procedure.
▶ Repair short to ground in harness and go to "Verification of Vehicle Repair" procedure.
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.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Go to "Component Inspection" procedure
Ignition "OFF"
Disconnect OTS connector.
Measure resistance between terminals 1 and 2 of OTS connector.(Component side)
Temp.(°C) | Temp.(°F) | Resistance(kΩ) | Temp.(°C) | Temp.(°F) | Resistance(kΩ) |
-20 | -4 | 16.52 | 40 | 104 | 1.11 |
0 | 32 | 6.00 | 60 | 140 | 0.54 |
20 | 68 | 2.45 | 80 | 176 | 0.29 |
Is sensor switching properly?
▶ 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.
▶ 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.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
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.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
