2ZR-FE ENGINE CONTROL  SFI SYSTEM  P0197  Engine Oil Temperature Sensor Low  P0198  Engine Oil Temperature Sensor High  


DESCRIPTION

A thermistor, whose resistance changes in accordance with the engine oil temperature, is built into the engine oil temperature sensor. As the engine oil temperature decreases, the thermistor resistance increases and as the engine oil temperature increases, the thermistor resistance decreases. The engine oil temperature sensor is connected to the ECM. A voltage of 5 V is supplied from terminal THEO via resistor R of the ECM. Since resistor R and the engine oil temperature sensor are connected in series, both the resistance and the electrical potential of THEO are subject to change in accordance with a change in the engine oil temperature.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0197 Engine Oil Temperature Sensor Low Short in engine oil temperature sensor circuit (1 trip detection logic).
·

Short in engine oil temperature sensor circuit

·

Engine oil temperature sensor

·

ECM


Comes on DTC stored
P0198 Engine Oil Temperature Sensor High Open in engine oil temperature sensor circuit (1 trip detection logic).
·

Open in engine oil temperature sensor circuit

·

Engine oil temperature sensor

·

ECM


Comes on DTC stored

MONITOR DESCRIPTION

The ECM monitors the engine oil temperature sensor and uses the sensor voltage to calculate the engine oil temperature. If the output voltage from the sensor deviates from the standard range, the ECM determines that the engine oil temperature sensor has malfunctioned and stores a DTC.

Example:

If the engine oil temperature sensor output voltage is less than 0.13 V for 3 seconds or more, the ECM determines that the engine oil temperature sensor circuit is shorted and stores DTC P0197. If the engine oil temperature sensor output voltage is higher than 4.94 V for 3 seconds or more, the ECM determines that the engine oil temperature sensor circuit is open and stores DTC P0198.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4.

Turn the ignition switch off and wait for at least 30 seconds.

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Start the engine and wait 10 seconds or more.

7.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

8.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



9.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

10.

Input the DTC: P0197 or P0198.

11.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions


N/A
·

Unable to perform DTC judgment

·

Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit



HINT:
·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.




WIRING DIAGRAM

A390580E13
0.573,2.552 1.031,2.75 0.458,0.198 10 false B63 0.573,2.729 3.333,2.969 2.76,0.24 10 false Engine Oil Temperature Sensor 2.229,1.344 2.688,1.542 0.458,0.198 10 false 2 2.208,1.958 2.667,2.156 0.458,0.198 10 false 1 1.719,1.333 2.177,1.531 0.458,0.198 10 false DC5V 1.792,1.854 2.25,2.052 0.458,0.198 10 false GND 5.281,1.333 6,1.708 0.719,0.375 10 false THEO 5.292,1.927 6.01,2.302 0.719,0.375 10 false ETHE 5,1.333 5.719,1.708 0.719,0.375 10 false 89 5,1.927 5.719,2.302 0.719,0.375 10 false 90 5.333,2.99 6.052,3.365 0.719,0.375 10 false B64 5.698,2.99 6.417,3.365 0.719,0.375 10 false ECM 5.854,1.219 6.573,1.594 0.719,0.375 10 false R 5.875,0.948 6.594,1.323 0.719,0.375 10 false 5 V

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.READ VALUE USING GTS (ENGINE OIL TEMPERATURE SENSOR)
a.

Connect the GTS to the DLC3.


b.

Start the engine and warm it up.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Oil Temperature Sensor.

Powertrain > Engine and ECT > Data List
Tester Display
Engine Oil Temperature Sensor
50003 234 710

e.

Read the value displayed on the GTS.

Standard Value:

Between 80 and 110°C (176 and 230°F) with warm engine and engine idling


Result:
Result Proceed to
-40°C (-40°F) A
Higher than 166°C (331°F) B
Between 80 and 110°C (176 and 230°F) C


HINT:
·

If there is an open circuit, the GTS indicates -40°C (-40°F).

·

If there is a short circuit, the GTS indicates higher than 166°C (331°F).





A

2.READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

B

4.READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

C

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


2.READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)
a.

Disconnect the engine oil temperature sensor connector.

A403641C02
4.198,1.26 4.635,1.5 0.438,0.24 4.896,1.76 5.198,1.427 false 5.771,1.729 5.5,1.448 false 1.167,0.604 1.521,0.865 0.354,0.26 10 false *1 2.781,0.583 3.135,0.844 0.354,0.26 10 false *2 4.823,0.698 5.177,0.958 0.354,0.26 10 false *a 2.635,1.219 3.188,1.5 0.552,0.281 10 false THEO 2.646,1.583 3.198,1.865 0.552,0.281 10 false ETHE 1.375,1.521 1.927,1.802 0.552,0.281 10 false GND 1.323,1 1.875,1.281 0.552,0.281 10 false DC5V 4.75,1.792 5.302,2.073 0.552,0.281 10 false GND 5.635,1.781 6.188,2.063 0.552,0.281 10 false DC5V 4.302,1.302 4.854,1.583 0.552,0.281 10 false B63
*1 Engine Oil Temperature Sensor *2 ECM
*a Front view of wire harness connector
(to Engine Oil Temperature Sensor) 		- -



b.

Connect terminals B63-1 (GND) and B63-2 (DC5V) of the engine oil temperature sensor connector on the wire harness side.


c.

Connect the GTS to the DLC3.


d.

Turn the ignition switch to ON.


e.

Turn the GTS on.


f.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Oil Temperature Sensor.

Powertrain > Engine and ECT > Data List
Tester Display
Engine Oil Temperature Sensor
50003 234 710

g.

Read the value displayed on the GTS.

Standard Value:

Higher than 166°C (331°F)



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE OIL TEMPERATURE SENSOR

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ENGINE OIL TEMPERATURE SENSOR>REMOVAL


NG

3.CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)
3.CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)
a.

Disconnect the engine oil temperature sensor connector.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
B63-2 (DC5V) - B64-89 (THEO) Always Below 1 Ω
B63-1 (GND) - B64-90 (ETHE) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
A403642C01
0.854,0.396 1.167,0.594 0.313,0.198 10 false *1 2.583,0.323 2.896,0.521 0.313,0.198 10 false *2 2.219,0.813 2.667,1.01 0.448,0.198 10 false THEO 2.219,1.188 2.667,1.385 0.448,0.198 10 false ETHE 1.063,1.188 1.51,1.385 0.448,0.198 10 false GND 1,0.823 1.448,1.021 0.448,0.198 10 false DC5V
*1 Engine Oil Temperature Sensor
*2 ECM


a.

Disconnect the engine oil temperature sensor connector.


b.

Connect the GTS to the DLC3.


c.

Turn the ignition switch to ON.


d.

Turn the GTS on.


e.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Oil Temperature Sensor.

Powertrain > Engine and ECT > Data List
Tester Display
Engine Oil Temperature Sensor
50003 234 710

f.

Read the value displayed on the GTS.

Standard Value:

-40°C (-40°F)



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE OIL TEMPERATURE SENSOR

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ENGINE OIL TEMPERATURE SENSOR>REMOVAL


NG

5.CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)
5.CHECK HARNESS AND CONNECTOR (ENGINE OIL TEMPERATURE SENSOR - ECM)
a.

Disconnect the engine oil temperature sensor connector.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
B63-2 (DC5V) or B64-89 (THEO) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR