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Nissan Sentra B18 (2020-2025) Service Manual: Engine Control System

Symptom Table

Symptom Table

SYSTEM — BASIC ENGINE CONTROL SYSTEM

 

SYMPTOM

Reference page

HARD/NO START/RESTART (EXCP. HA)

ENGINE STALL

HESITATION/SURGING/FLAT SPOT

SPARK KNOCK/DETONATION

LACK OF POWER/POOR ACCELERATION

HIGH IDLE/LOW IDLE

ROUGH IDLE/HUNTING

IDLING VIBRATION

SLOW/NO RETURN TO IDLE

OVERHEATS/WATER TEMPERATURE HIGH

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

BATTERY DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

AM

HA

 

Fuel

Fuel pump circuit

1

1

2

3

2

 

2

2

   

3

 

2

Component Function Check

Fuel pressure regulator system

3

3

4

4

4

4

4

4

4

 

4

   

Work Procedure

Fuel injector circuit

1

1

2

3

2

 

2

2

   

2

   

Component Function Check

Evaporative emission system

3

3

4

4

4

4

4

4

4

 

4

   

System Description

Fuel rail pressure sensor circuit

1

1

2

2

2

2

2

2

DTC Description

High pressure fuel pump circuit

4

3

Component Function Check

Air

Positive crankcase ventilation system

3

3

4

4

4

4

4

4

4

 

4

1

 

POSITIVE CRANKCASE VENTILATION : Periodic Maintenance

Incorrect idle speed adjustment

     

1

1

1

1

 

1

   

IDLE SPEED : Periodic Maintenance

Electric throttle control actuator

1

1

2

3

3

2

2

2

2

 

2

 

2

DTC Description,

DTC Description

Intake manifold runner control valve circuit

4

4

DTC Description

Ignition

Incorrect ignition timing adjustment

3

3

1

1

1

 

1

1

   

1

   

IGNITION TIMING : Periodic Maintenance

Ignition circuit

1

1

2

2

2

 

2

2

   

2

   

Component Function Check

Main power supply and ground circuit

2

2

3

3

3

 

3

3

 

2

3

 

Diagnosis Procedure

Main power supply and ground circuit

1

1

2

2

2

 

2

2

   

2

   

Diagnosis Procedure

Engine coolant temperature sensor circuit

3

3

3

     

DTC Description

Air fuel ratio (A/F) sensor 1 circuit

           

DTC Description,

DTC Description,

DTC Description

Throttle position sensor circuit

   

2

2

     

DTC Description,

DTC Description,

DTC Description,

DTC Description,

DTC Description,

Accelerator pedal position sensor circuit

   

3

2

1

           

DTC Description,

DTC Description,

DTC Description

Knock sensor circuit

   

2

             

3

   

DTC Description

Engine oil temperature sensor circuit

   

4

 

2

         

3

   

DTC Description

Crankshaft position sensor circuit

2

2

 

   

   

DTC Description

Intake camshaft position sensor circuit

3

2

 

   

   

DTC Description

Nissan Sentra Vehicle speed signal circuit

 

2

3

 

3

         

3

   

DTC Description

ECM

2

2

3

3

3

3

3

3

3

3

3

   

DTC Description

Electric intake valve timing control module circuit

   

3

 

3

3

             

DTC Description,

DTC Description

Electric intake valve timing control actuator circuit

       

3

               

DTC Description,

DTC Description

Exhaust valve timing control solenoid valve circuit

 

3

2

 

1

3

2

2

3

 

3

   

DTC Description,

DTC Description

Exhaust camshaft position sensor circuit

5

5

5

5

5

5

5

5

DTC Description

Transmission range switch

   

3

 

3

 

3

3

   

3

   

DTC Description

Refrigerant pressure sensor circuit

 

2

 

3

3

 

4

   

Component Function Check

Electrical load signal circuit

           

3

         

Component Function Check

Air conditioner circuit

2

2

3

3

3

3

3

3

3

 

3

 

2

Work Flow(Automatic air conditioner),

Work Flow(Manual air conditioner)

ABS actuator and electric unit (control unit)

4

Work Flow

1 - 6: The numbers refer to the order of inspection.

(continued on next table)

 

SYMPTOM

Reference page

HARD/NO START/RESTART (EXCP. HA)

ENGINE STALL

HESITATION/SURGING/FLAT SPOT

SPARK KNOCK/DETONATION

LACK OF POWER/POOR ACCELERATION

HIGH IDLE/LOW IDLE

ROUGH IDLE/HUNTING

IDLING VIBRATION

SLOW/NO RETURN TO IDLE

OVERHEATS/WATER TEMPERATURE HIGH

EXCESSIVE FUEL CONSUMPTION

EXCESSIVE OIL CONSUMPTION

BATTERY DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

AM

HA

 

Fuel

Fuel tank

5

5

                     

Inspection

Fuel piping

5

5

5

5

5

5

Inspection

Vapor lock

                       

—

Valve deposit

5

5

5

5

 

5

5

   

5

—

Poor fuel (Heavy weight gasoline, Low octane)

     

—

Air

Air duct

 

5

5

 

5

 

5

5

   

5

   

Inspection

Air cleaner

Inspection

Air leakage from air duct

(Mass air flow sensor — electric throttle control actuator)

5

5

5

5

Inspection

Electric throttle control actuator

Exploded View

Air leakage from intake manifold/Collector/Gasket

—

Cranking

Battery

1

1

1

 

1

 

1

1

   

1

 

1

Work Flow (With 165-DSS-5000P)(With 165-DSS-5000P),

Work Flow (Without 165-DSS-5000P)(Without 165-DSS-5000P)

Generator circuit

Work Flow (With 165-DSS-5000P)(With 165-DSS-5000P),

Work Flow (Without 165-DSS-5000P)(Without 165-DSS-5000P)

Starter circuit

3

           

Work Flow (With 165-DSS-5000P)(With 165-DSS-5000P),

Work Flow (Without 165-DSS-5000P)(Without 165-DSS-5000P)

Signal plate

6

Inspection

Engine

Cylinder head

5

5

5

5

5

 

5

5

   

5

   

Inspection

Cylinder head gasket

4

3

 

Cylinder block

6

6

6

6

6

6

6

 

6

4

Inspection

Piston

Piston ring

Connecting rod

 

Bearing

Crankshaft

Valve mechanism

Timing chain

5

5

5

5

5

 

5

5

   

5

   

Inspection

Camshaft

Inspection

Intake valve timing control

Component Inspection

Exhaust valve timing control

Component Inspection

Intake valve

3

Inspection

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/Gasket

5

5

5

5

5

 

5

5

   

5

   

Inspection,

Inspection

Three way catalyst

Lubrication

Oil pan/Oil strainer/Oil pump/Oil filter/Oil gallery/Oil cooler

5

5

5

5

5

 

5

5

   

5

   

Inspection,

Inspection,

Inspection

Oil level (Low)/Filthy oil

Inspection

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

 

5

5

 

4

5

   

Inspection,

Inspection

Thermostat

5

Inspection

Water pump

 

Exploded View

Water gallery

Inspection

Cooling fan

5

Exploded View

Coolant level (Low)/Contaminated coolant

Inspection

1 - 6: The numbers refer to the order of inspection.

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