Engine Controls - Tests W/o Codes: Diagnosis Hyundai Accent I

SYMPTOM DIAGNOSIS

Symptom checks cannot be used properly unless the problem occurs while the vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC TESTING and TESTS W/CODES articles were performed before diagnosing a symptom.

1. «BASIC TESTING»(ref-16591)
2. «TESTS W/CODES»(ref-16576)

Symptoms Available For Diagnosis Include The Following

1. Will Not Start (Cranks Okay)
2. Difficult To Start (Cranks Okay)
3. Engine Surges
4. Rough Or Unstable Idle
5. Excessively Fast Idle
6. Engine Stalls
7. Engine Lacks Power
8. Engine Misfires Or Hesitates
9. Engine Runs Rough On Deceleration
10. Afterburn In Exhaust System
11. Poor Fuel Mileage
12. Detonation Or Knocking
13. Fails Emission Test

FAILS EMISSION TEST

1. Ensure air intake system is not restricted.
2. Ensure engine is at normal operating temperature.
3. Ensure fuel system pressure is correct.
4. Ensure base timing is correct.
5. Check for correct PCV valve operation.
6. Check crankcase for gasoline contamination.
7. Test IAC solenoid.
8. Test EGR system for correct operation.
9. Test purge control valve operation.
10. Ensure throttle position sensor has correct adjustment and resistance value.
11. Test operation of coolant temperature sensor.
12. Ensure exhaust system is not restricted.

INTERMITTENT PROBLEM DIAGNOSIS

Intermittent fault testing requires duplicating the circuit or component failure to identify the problem. These procedures may lead to computer setting a fault code which may help in diagnosis.

When monitoring voltage, ensure ignition switch is in ON position or vehicle is running. When monitoring circuit resistance, ensure ignition switch is in OFF position or negative battery cable is disconnected.