Opel Frontera UBS. Manual - part 2445

 

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Opel Frontera UBS. Manual - part 2445

 

 

6E–94

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0197 (Flash DTC 16) 

Oil Temp Sensor Low Voltage

060RW129

Circuit Description

The engine oil temperature (OT) sensor is a thermistor
mounted  in the oil rail.  The Engine Control Module ECM
applies a voltage (about 5 volts) through a pull-up resistor
to the ECT signal circuit.  When the engine oil is cold, the
sensor (thermistor) resistance is high, therefore the ECM
will measure a high signal voltage.  As the engine oil
warms, the sensor resistance becomes lower, and the OT
signal voltage measured at the ECM drops.

Action Taken When the DTC Sets

D

The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

D

DTC P0197 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.

Diagnostic Aids

Check for the following conditions:

D

Poor connection at ECM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.

D

Damaged harness – Inspect the wiring harness for
damage.  If the harness appears to be OK, observe the
OT display on the Tech 2 while moving connectors and
wiring harnesses related to the OT sensor.  A change
in the OT display will indicate the location of the fault.

If DTC P0197 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
If it is determined that the DTC occurs intermittently.

6E–95

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Verifies that the fault is present.

3. If DTC P0197 can be repeated only by duplicating

the Failure Records conditions, refer to the
“Temperature vs. Resistance Values” table.  The
table may be used to test the OT sensor at various
temperatures to evaluate the possibility of a
“shifted” sensor that may be shorted above or below
a certain temperature.  If this is the case, replace
the OT sensor.  If the OT sensor appears to be OK,
the fault is intermittent; refer to 

Diagnostic Aids.

Engine Oil Temperature Sensor

°

C

°

F

Ohms

Temperature vs. Resistance Values

(approximate)

80

176

332

25

77

2796

15

59

4450

DTC P0197 – OT Sensor  Low Voltage

 

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD) System Check”
performed?

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Ignition “ON,” engine “OFF.”
2. Observe the “Eng Oil Temp” display on the Tech 2.

Is the “Eng Oil Temp” below the specified value?

139

°

C

(282

°

F)

Go to 

Step 4

Go to 

Step 3

3

1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records

conditions as noted.

4. Using a Tech 2, monitor “ DTC” info for DTC P0197.

Does the Tech 2 indicate DTC P0197 failed this
ignition?

Go to 

Step 4

Refer to

Diagnostic

Aids

4

1. Disconnect the OT sensor electrical connector.
2. Observe the “Eng Oil Temp” display on the Tech 2.

Is the “Eng Oil Temp” at the specified value?

–39

°

C

(–38

°

F)

Go to 

Step 6

Go to 

Step 5

5

1. Ignition “OFF.”
2. Disconnect the ECM and check the OT signal circuit

for a short to ground or a short to the sensor ground
circuit.

3. If the OT signal circuit is shorted. repair it as

necessary.

Was the OT signal circuit shorted to ground?

Verify repair

Go to 

Step 7

6

Replace the OT sensor.

Is the action complete?

Verify repair

7

Replace the ECM (Refer to the Data Programming in
Case of ECM change).

Is the action complete?

Verify repair

6E–96

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0198 (Flash DTC 16) 

Oil Temp Sensor High Voltage

060RW129

Circuit Description

The engine oil temperature (OT) sensor is a thermistor
mounted  in the oil rail.  The Engine Control Module ECM
applies a voltage (about 5 volts) through a pull-up resistor
to the ECT signal circuit.  When the engine oil is cold, the
sensor (thermistor) resistance is high, therefore the ECM
will measure a high signal voltage.  As the engine oil
warms, the sensor resistance becomes lower, and the OT
signal voltage measured at the ECM drops.

Action Taken When the DTC Sets

D

The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

D

DTC P0198 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.

Diagnostic Aids

Check for the following conditions:

D

Poor connection at ECM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.

D

Damaged harness – Inspect the wiring harness for
damage.  If the harness appears to be OK, observe the
OT display on the Tech 2 while moving connectors and
wiring harnesses related to the OT sensor.  A change
in the OT display will indicate the location of the fault.

If DTC P0198 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
If it is determined that the DTC occurs intermittently.

6E–97

4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Verifies that the fault is present.

3. If DTC P0198 can be repeated only by duplicating

the Failure Records conditions, refer to the
“Temperature vs. Resistance Value” table.  The
table may be used to test the OT sensor at various
temperatures to evaluate the possibility of a
“shifted” sensor that may be shorted above or below
a certain temperature.  If this is the case, replace
the OT sensor.  If the OT sensor appears to be OK,
the fault is intermittent; refer to 

Diagnostic Aids.

Engine Oil Temperature Sensor

°

C

°

F

Ohms

Temperature vs. Resistance Values

(approximate)

80

176

332

25

77

2796

15

59

4450

DTC P0198 – OT Sensor High Voltage

 

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD) System Check”
performed?

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Ignition “ON,” engine “OFF.”
2. Observe the “Eng Oil Temp” display on the Tech 2.

Is the “Eng Oil Temp” below the specified value?

–39

°

C

(–38

°

F)

Go to 

Step 4

Go to 

Step 3

3

1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records

conditions as noted.

4. Using a Tech 2, monitor the “ DTC” info for DTC

P0198.

Does the Tech 2 indicate DTC P0198 failed?

Refer to 

Test

Description

Refer to

Diagnostic

Aids

4

1. Disconnect the OT sensor electrical connector.
2. Jumper the OT signal circuit and the sensor ground

circuit together at the OT sensor harness
connector.

3. Observe the “Eng Oil Temp” display on the Tech 2.

Is the “Eng Oil Temp” at the specified value?

140

°

C

(284

°

F)

Go to 

Step 6

Go to 

Step 5

5

1. Jumper the OT signal circuit at the OT sensor

harness connector to chassis ground.

2. Observe the “Eng Oil Temp” display on the Tech 2.

Is the “Eng Oil Temp” at the specified value?

140

°

C

(284

°

F)

Go to 

Step 7

Go to 

Step 8

6

Check for poor connections at the OT sensor and
replace terminals if necessary.

Did any terminals require replacement?

Verify repair

Go to 

Step 10

7

1. Ignition “OFF.”
2. Disconnect the ECM, and check the OT sensor

ground circuit for an open.

3. If the OT sensor ground circuit is open, repair it as

necessary.

Was the OT sensor ground circuit open?

Verify repair

Go to 

Step 9

 

 

 

 

 

 

 

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