LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2023 >> Altima SL, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Pr25DD) (2 Of 2) >> Symptom Diagnosis >> Engine Control System >> Symptom Table
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Symptom Table

SYSTEM - BASIC ENGINE CONTROL SYSTEM 

  SYMPTOM Reference
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 Low pressure 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     Component Function Check
Fuel injector circuit 1 1 2 3 2   2 2     2     Component Function Check
Fuel rail pressure sensor circuit 1 1 2 2 2   2 2     2     DTC Description
High pressure fuel pump circuit     4   3                 DTC Diagnosis Procedure
Evaporative emission system 3 3 4 4 4 4 4 4 4   4     EVAPORATIVE EMISSION SYSTEM : Inspection 
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     Work Procedure
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     System Description
EGR EGR volume control valve circuit   2 2 3 3 3 2 2 3   3     DTC Diagnosis Procedure
EGR system 2 1       DTC Diagnosis ProcedureDTC Diagnosis Procedure
Main power supply and ground circuit 2 2 3 3 3   3 3   2 3     Diagnosis Procedure
Mass air flow sensor circuit 1 1 2 2 2   2 2     2     DTC Description , DTC Description
Intake air temperature sensor circuit           DTC Diagnosis Procedure , DTC Diagnosis Procedure
Engine coolant temperature sensor circuit 3 3 3       DTC Description , DTC Description
Air fuel ratio (A/F) sensor 1 circuit             DTC Description , DTC Description , 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
Heated oxygen sensor 2 circuit     6   6   6 6     5     DTC Description , DTC Diagnosis Procedure , DTC Diagnosis Procedure
Knock sensor circuit     2               3     DTC Description
Engine oil temperature sensor circuit     4   2           3     DTC Diagnosis Procedure , DTC Diagnosis Procedure
Engine oil pressure sensor circuit     4   4 3 3 3     3     DTC Diagnosis Procedure , DTC Diagnosis Procedure
Crankshaft position sensor circuit 2 2                       DTC Description
Intake camshaft position sensor circuit 3 2                       DTC Description
Vehicle speed signal circuit   2 3   3           3     DTC Description
ECM 2 2 3 3 3 3 3 3 3 3 3     DTC Description , DTC Description
Electric Intake valve timing control module circuit     3   3 3               Diagnosis Procedure , DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description
Electric intake valve timing control actuator circuit         3                 DTC Description ,DTC Description ,DTC Description ,DTC Description ,DTC Description
Exhaust valve timing intermediate lock control solenoid valve circuit                           DTC Description , DTC Description
Exhaust camshaft position sensor circuit 5 5 5 5 5   5 5     5     DTC Description
PNP signal circuit     3   3   3 3     3     ENGINE OIL : Inspection
Refrigerant pressure sensor circuit   2       3     3   4     ENGINE OIL : Inspection
Electrical load signal circuit             3             Component Function Check
Intake manifold runner control valve motor circuit         4 4               ENGINE OIL : Inspection
Intake manifold runner control valve position sensor circuit         4 4               DTC Description
Intake manifold tuning valve circuit         1                 ENGINE OIL : Inspection
Air conditioner circuit 2 2 3 3 3 3 3 3 3   3   2 ENGINE OIL : Inspection , ENGINE OIL : Inspection
Battery current sensor circuit         4   5 5         3 ENGINE OIL : Inspection , ENGINE OIL : Inspection , ENGINE OIL : Inspection , ENGINE OIL : Inspection
Battery temperature sensor circuit         4   5 5         3 DTC Diagnosis Procedure
ASCD steering switch circuit                           DTC Diagnosis Procedure
ABS actuator and electric unit (control unit)     4                     DTC Diagnosis Procedure , DTC Diagnosis Procedure

1 - 6: The numbers refer to the order of inspection. (continued on next table)

SYSTEM - ENGINE MECHANICAL and OTHER 

  SYMPTOM Reference
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                       DTC Diagnosis Procedure
Fuel piping 5 5 5 5 5 5 DTC Diagnosis Procedure
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     DTC Diagnosis Procedure
Air cleaner
Air leakage from air duct (Mass air flow sensor - electric throttle control actuator) 5 5 5 5
Electric throttle control actuator DTC Diagnosis ProcedureDTC Diagnosis Procedure
Air leakage from intake manifold/Collector/Gasket
Cranking Battery 1 1 1   1   1 1     1   1 DTC Diagnosis Procedure
Generator circuit DTC Diagnosis Procedure , DTC Diagnosis Procedure
Starter circuit 3             ENGINE COOLANT : Inspection
Signal plate 6 ENGINE COOLANT : Inspection
PNP signal 4 ENGINE COOLANT : Inspection
Engine Cylinder head 5 5 5 5 5   5 5     5     ENGINE COOLANT : InspectionENGINE COOLANT : Inspection
Cylinder head gasket 4 3  
Cylinder block 6 6 6 6 6 6 6   6 4 ENGINE COOLANT : Inspection
Piston
Piston ring
Connecting rod  
Bearing
Crankshaft
Valve mechanism Timing chain 5 5 5 5 5   5 5     5 3   ENGINE COOLANT : Inspection
Camshaft ENGINE COOLANT : Inspection
Intake valve timing control ENGINE COOLANT : Inspection
Exhaust valve timing control ENGINE COOLANT : Inspection
Intake valve ENGINE COOLANT : Inspection
Exhaust valve
Exhaust Exhaust manifold/Tube/Muffler/Gasket 5 5 5 5 5   5 5     5     ENGINE COOLANT : Inspection , Work Flow Work Flow
Three way catalyst
EGR volume control valve   5   5 5     5   5 5     Work Flow
EGR cooler   5   5 5     5   5 5     Work Flow
Lubrication Oil pan/Oil strainer/Oil pump/Oil filter/Oil gallery/Oil cooler 5 5 5 5 5   5 5     5     Work Flow , OIL PAN (UPPER) : Removal and Installation , OIL PAN (UPPER) : Removal and Installation , OIL PAN (UPPER) : Removal and Installation , OIL PAN (UPPER) : Removal and Installation
Oil level (Low)/Filthy oil OIL PAN (UPPER) : Removal and Installation
Cooling Radiator/Hose/Radiator filler cap 5 5 5 5 5   5 5   4 5     OIL PAN (UPPER) : Removal and Installation
Thermostat 5 OIL PAN (UPPER) : Removal and Installation
Water pump   OIL PAN (UPPER) : Removal and Installation
Water gallery System Description
Cooling fan 5 OIL PAN (UPPER) : Removal and Installation
Coolant level (Low)/Contaminated coolant OIL PAN (UPPER) : Removal and Installation
NVIS (NISSAN Vehicle Immobilizer System - NATS) 1 1                       OIL PAN (UPPER) : Removal and Installation

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