Nissan Sentra. Manual - part 376

 

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Nissan Sentra. Manual - part 376

 

 

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< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0122, P0123 TP SENSOR

P0122, P0123 TP SENSOR

DTC Logic

INFOID:0000000009758463

DTC DETECTION LOGIC

NOTE:

If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Refer to 

EC-353, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for 1 second.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-200, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758464

1.

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect electric throttle control actuator harness connector.

3. Turn ignition switch ON.

4. Check the voltage between electric throttle control actuator harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

DTC No.

CONSULT screen terms

(Trouble diagnosis con-

tent)

DTC detecting condition

Possible cause

P0122

TP SEN 2/CIRC-B1
(Throttle/Pedal position 
sensor/switch “A” circuit 
low)

An excessively low voltage from the TP sensor 
2 is sent to ECM.

• Harness or connectors

(TP sensor 2 circuit is open or shorted.)

• Electric throttle control actuator

(TP sensor 2)

P0123

TP SEN 2/CIRC-B1
(Throttle/Pedal position 
sensor/switch “A” circuit 
high)

An excessively high voltage from the TP sensor 
2 is sent to ECM.

+

−

Voltage

(Approx.)

Electric throttle control actu-

ator

Connector

Terminal

F7

2

Ground

5.0 V

P0122, P0123 TP SENSOR

EC-201

< DTC/CIRCUIT DIAGNOSIS >

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2.

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-

nector.

4. Also check harness for short to power.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-

nector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT

1. Check the continuity between electric throttle control actuator harness connector and ECM harness con-

nector.

2. Also check harness for short to ground and to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to 

EC-202, "Component Inspection (TP Sensor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace electric throttle control actuator. Refer to 

EM-27, "Removal and Installation"

.

+

−

Continuity

Electric throttle control actu-

ator

ECM

Connector

Terminal

Connector

Terminal

F7

2

F25

80

Existed

+

−

Continuity

Electric throttle control actu-

ator

ECM

Connector

Terminal

Connector

Terminal

F7

4

F25

78

Existed

+

−

Continuity

Electric throttle control actu-

ator

ECM

Connector

Terminal

Connector

Terminal

F7

3

F25

77

Existed

EC-202

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0122, P0123 TP SENSOR

Component Inspection (TP Sensor)

INFOID:0000000009758465

1.

CHECK THROTTLE POSITION SENSOR

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Perform “ Throttle Valve Closed Position Learning”. Refer to 

EC-139, "Work Procedure"

.

4. Turn ignition switch ON.

5. Set selector lever to D (CVT) or 1st (M/T) position.

6. Check the voltage between ECM harness connector terminals as per the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace electric throttle control actuator. Refer to 

EM-27, "Removal and Installation"

.

ECM

Condition

Voltage

Connec-

tor

+

−

Terminal

F25

77

78

Accelerator 
pedal

Fully released

Less than 4.75 V

Fully depressed

More than 0.36 V

79

Fully released

More than 0.36 V

Fully depressed

Less than 4.75 V

P0125 ECT SENSOR

EC-203

< DTC/CIRCUIT DIAGNOSIS >

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P0125 ECT SENSOR

DTC Logic

INFOID:0000000009758466

DTC DETECTION LOGIC

NOTE:

• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to 

EC-

196, "DTC Logic"

.

• If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or

P0118. Refer to 

EC-198, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION

With CONSULT

1. Turn ignition switch ON.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Check that “COOLANT TEMP/S” is above 10

°C (50°F).

With GST

Follow the procedure “With CONSULT” above.
Is it above 5

°C (41°F)?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Start engine and run it for 65 minutes at idle speed.

2. Check 1st tip DTC.

If “COOLANT TEMP/S” indication increases to more than 10

°C (50°F) within 65 minutes, stop engine

because the test result will be OK.

CAUTION:

Be careful not to overheat engine.

With GST

Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-203, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758467

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0125

ECT SENSOR
(Insufficient coolant tempera-
ture for closed loop fuel control)

• Voltage sent to ECM from the sensor is not 

practical, even when some time has 
passed after starting the engine.

• Engine coolant temperature is insufficient 

for closed loop fuel control.

• Harness or connectors

(High resistance in the circuit)

• Engine coolant temperature sensor
• Thermostat

 

 

 

 

 

 

 

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