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

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 Flow

Fuel injector circuit

1

1

2

3

2

2

2

2

Component Function Check

Fuel level sensor circuit

Diagnosis Procedure , Diagnosis Procedure

Fuel tank temperature sensor circuit

Diagnosis Procedure , Diagnosis Procedure

Evaporative emission system

3

3

4

4

4

4

4

4

4

4

Inspection 

Air

Positive crankcase ventilation system

3

3

4

4

4

4

4

4

4

4

1

Inspection 

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 Logic , DTC Logic

Ignition

Incorrect ignition timing adjustment

3

3

1

1

1

1

1

1

Inspection 

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

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

DTC Logic , DTC Description

Intake air temperature sensor circuit

Diagnosis Procedure , Diagnosis Procedure

Engine coolant temperature sensor circuit

3

3

3

DTC Description , DTC Logic

Air fuel ratio (A/F) sensor 1 circuit

DTC Logic , DTC Logic , DTC Logic , DTC Description , DTC Description

Throttle position sensor circuit

2

2

DTC Description , DTC Description , DTC Logic , DTC Logic , DTC Logic

Accelerator pedal position sensor circuit

3

2

1

DTC Description , DTC Description , DTC Logic

Heated oxygen sensor 2 circuit

6

6

6

6

5

DTC Logic , Diagnosis Procedure , Diagnosis Procedure

Knock sensor circuit

2

3

DTC Description

Engine oil temperature sensor circuit

4

2

3

Diagnosis Procedure , Diagnosis Procedure

Engine oil pressure sensor circuit

4

4

3

3

3

3

Diagnosis Procedure , Diagnosis Procedure

Crankshaft position sensor (POS) circuit

2

2

DTC Logic

Camshaft position sensor (PHASE) circuit

3

2

DTC Logic

Vehicle speed signal circuit

2

3

3

3

DTC Logic

ECM

2

2

3

3

3

3

3

3

3

3

3

DTC Logic , DTC Logic , DTC Logic , DTC Logic

Intake valve timing control solenoid valve circuit

3

2

1

3

2

2

3

3

DTC Logic , DTC Logic

Intake valve timing intermediate lock control solenoid valve circuit

DTC Description

Exhaust valve timing control solenoid valve circuit

3

2

1

3

2

2

3

3

Diagnosis Procedure

PNP signal circuit

3

3

3

3

3

DTC Logic

Refrigerant pressure sensor circuit

2

3

3

4

Component Function Check

Electrical load signal circuit

3

Component Function Check

Intake manifold runner control valve motor circuit

4

4

DTC Logic

Intake manifold runner control valve position sensor circuit

4

4

DTC Description

Intake manifold tuning valve circuit

1

DTC Logic

Air conditioner circuit

2

2

3

3

3

3

3

3

3

3

2

Work Flow , Work Flow

Battery current sensor circuit

4

5

5

3

Diagnosis Procedure , Diagnosis Procedure , Diagnosis Procedure , Diagnosis Procedure

Battery temperature sensor circuit

4

5

5

3

Diagnosis Procedure

ASCD steering switch circuit

Diagnosis Procedure

ABS actuator and electric unit (control unit)

4

Work Flow , Work Flow