When the starter to operate, the battery terminal voltage decreases by a large amount of current flow. Even if the battery voltage is normal before the engine starts, the starter cannot be rotated normally unless a certain amount of the battery voltage exists when starter starts. Therefore, the following terminal voltages have to be measured while the engine cranks.
1.Check battery terminal voltage
Turn the ignition switch to START, and measure the voltage at the battery terminals.
Standard: 9.6 V or higher
If the voltage is lower than 9.6 V, replace the battery.
If the starter does not operate, or if it turns slowly, be sure to check first whether the battery is normal or not.
Even if the measured terminal voltage is at the normal level, stained or corroded terminals may cause poor starting due to increased resistance, leading to a decrease in the voltage actually applied by the battery to the starter motor when the ignition switch is turned to START.
2.Check terminal 30 voltage
Turn the ignition switch to START, and measure the voltage between starter terminal 30 and the body ground.
Standard: 8.0 V or higher
If the voltage is lower than 8.0 V, repair or replace the starter cable.
Since the location and appearance of terminal 30 may differ depending on the type of starter motor, make sure of these by checking the Repair Manual.
3.Check terminal 50 voltage
Turn the ignition switch to START, and measure the voltage between starter terminal 50 and the body ground.
Standard: 8.0 V or higher
If the voltage is lower than 8.0 V, check the fusible link, ignition switch, neutral start switch, starter relay, clutch start relay, clutch start switch, etc., one at a time, referring to the wiring diagram. Repair or replace any faulty parts.
A starter of a vehicle that has a clutch start switch does not start unless the clutch pedal is fully depressed.
Among the vehicles with a theft deterrent system, if the system is activated, there are some types in which the starter does not start because the starter relay stays open even if the ignition switch is at START.