Automotive starting system mainly by the battery, ignition switch, starting relay and starter and other components. Start the system work, the current circuit is: battery positive -> ignition switch start -> start relay -> starter electromagnetic switch -> DC motor -> Ground, battery negative.

Car starter system of the main failures are not the starter, starter running weak and starter slipping. The following specific models, for example, to introduce its starting system common faults and exclusion.

The starter does not turn

Example 1

Symptom: a just checked Jinliang SYl32 car starter, for no-load test, only "buzzing" to call and can not run, and smell a burning smell.

Inspection and exclusion: disassembly examination found that the assembly of the starter after repair, the brush wire position is not adjusted, so during the no-load test caused by insulated wire brush and the thresholding bolt through the collision, causing ground short circuit, the starter Can not run. Re-installed starter, and carefully adjust the location of insulated brush lead, and then try again, troubleshooting.

Example 2

Symptom: a Isuzu truck, electrical equipment maintenance vehicle, turn on the ignition switch start starter engine, the starter does not turn, but they can hear the sound when the electromagnetic switch is closed. Initially thought that the fault is not in the electromagnetic switch, but this is not the case. With a screwdriver shorted electromagnetic switch power supply column and then the magnetic field column test, the starter is running normally.

Inspection and exclusion: After inspection, found that the repair is not the activities of iron core position screw adjustment position, resulting in activities of the core stroke is insufficient, can not make the contact plate and the main contact junction, which can not power. Adjust the location of the activities of iron core limit screw, loading test again, troubleshooting.

Example 3

Trouble phenomenon: a Beijing BJl30-type trucks, overhaul after the test, the ignition switch to start the engine starting starter, the starter does not turn, but sometimes the electromagnetic switch is issued a clear "da da" sound.

Inspection and exclusion: short-circuit with starter power star column and then the magnetic field column test, the starter does not turn, indicating that the DC motor armature no current through the main circuit. Careful inspection found that battery grounding wire connection with the body due to overhaul when the rust is not net, together with the loose wire connection, resulting in bad battery grounding, which does not turn the starter.

Starter running weak

Example 1

Failure phenomenon: a liberation of goods vehicles, turn on the ignition switch starting file, starter operation is weak, can not drag the engine crankshaft rotation.

Check and exclude: suspected battery power shortage, but dress up the new battery, the test results remain the same. Check the starter wire connection is normal. The car starting relay for the combination. Remove the starter relay to the starter solenoid switch posts of the wire, the ignition switch in the starting block, measuring the starting relay S-side (to the starter side) voltage, the voltage is about 13.4v, indicating that the starting relay is working properly. Connected to the line, with a screwdriver to the electromagnetic switch power column and then the magnetic field column short-circuit, starter is still running weak, visible fault from the DC motor internal. Decomposition of the DC motor inspection found that the surface of the commutator has a layer of bright oil, brush springs are corrosion. Polished smooth commutator surface, replace the new brush spring, the complex re-try, troubleshooting.

Example 2

Trouble phenomenon: a cheetah brand jeep, with the starter starting engine, you can hear the electromagnetic switch "da, da" sound, but the starter is running weak.

Inspection and exclusion: After inspection, the battery is normal, the electromagnetic switch is not normal closing action, when the pass off, the electromagnetic switch is suspected to work poorly. Decomposition of the electromagnetic switch inspection, no obvious abnormalities. The core in the switch body freely, the contact plate and the main contact without serious signs of ablation, it is estimated that the electromagnetic switch to keep the coil and suction coil failure. Open coil inspection, found that the innermost layer has a few turns have charred. Replace the new electromagnetic switch, the loading test again, troubleshooting.

Starter idling skid

Example 1

Failure phenomenon: a Tianjin Xiali car, starting, the starter slip phenomenon is more serious, you need to repeatedly start several times to the car.

Inspection and exclusion: Analysis, this failure is mostly due to one-way clutch damage or wedge-shaped groove and the column due to severe wear and tear. Clutch will be one-way clutch in the vice, the hand-driven drive pinion check and found that both positive and negative rotation when there is no resistance, indicating one-way clutch has been damaged. Dress up the new one-way clutch. Troubleshooting.