Engine ignition system common failures of judgment and exclusion

Now introduced obd2 bluetooth the common faults of judgment and exclusion of non-contact ignition system as an example.

Engine ignition system

1. Fault classification

Ignition system fault according to their position in the ignition system can be divided into two kinds: low-voltage circuit failure and the failure of the high voltage circuit.

(1) obd2 scanner low-voltage circuit common faults:

Lack of battery save electricity; poor cable connection or confusion; battery Datie the bad; distributor or Hall sensor is damaged; ignition switch loss

Bad or poor wiring; the transistor ignition control unit is damaged or poor wiring. Most of the low voltage circuit fault diagnosis method using the ammeter or electricity

Pressure table-by-line examination to rule out the point of failure.

(2) obd2 scan tool high-voltage circuit common fault:

Off high-voltage or leakage; distributor cap rupture breakdown; distributor distributor rotor ablation rupture breakdown; spark plug electrode gap is too large or too

Small; excessive spark plug fouling; spark plug insulators damage; damaged or wiring off the ignition coil.

Most of the high-voltage circuit failure using a high-pressure fire test method, unplug the electrical center of high-voltage lines is about to be a cylinder of high-voltage lines, and placed the head distance cylinder 3-6mm at starting the engine test fire, sparks and sparks strong ignition system is working properly .

Ignition system does not work

(1) obd2 code reader Symptom: turn the ignition switch to start the engine, the engine has no reaction; high-pressure test fire, no spark high-voltage lines.

(2) Analysis and Diagnosis