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 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 

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

DTC Logic

Ignition

Incorrect ignition timing adjustment

3

3

1

1

1

1

1

1

Inspection 

Ignition signal circuit

1

1

2

2

2

2

2

2

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 Logic

Engine coolant temperature sensor circuit

3

3

3

DTC Logic

Air fuel ratio (A/F) sensor 1 circuit

DTC Logic

DTC Logic

DTC Logic

DTC Logic

DTC Logic

Throttle position sensor circuit

2

2

DTC Logic

DTC Logic

DTC Logic

DTC Logic

DTC Logic

Accelerator pedal position sensor circuit

3

2

1

DTC Logic

DTC Logic

DTC Logic

Heated oxygen sensor 2 circuit

6

6

6

6

5

DTC Logic

DTC Logic

DTC Logic

Knock sensor circuit

2

3

DTC Logic

Engine oil temperature sensor circuit

4

2

3

DTC Logic

Engine oil pressure sensor circuit

4

4

3

3

3

3

DTC Logic

Crankshaft position sensor circuit

2

2

DTC Logic

Camshaft position sensor 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

--

Intake valve timing control solenoid valve circuit

3

2

1

3

2

2

3

3

DTC Logic

Exhaust valve timing control solenoid valve circuit

3

2

1

3

2

2

3

3

DTC Logic

Exhaust valve timing control position sensor circuit

3

2

1

3

2

2

3

3

DTC Logic

PNP signal circuit

3

3

3

3

3

DTC Logic

Refrigerant pressure sensor circuit

2

3

3

4

Diagnosis Procedure

Electrical load signal circuit

3

Diagnosis Procedure

Air conditioner circuit

2

2

3

3

3

3

3

3

3

3

2

• MANUAL A/C

  Workflow

• MANUAL HEATER

  Workflow

ABS actuator and electric unit (control unit)

4

Work Flow