Electrical System 92 UENR0623-02 4. Measure the starting motor voltage from test point Diagnosis Procedure for 24 V 5.5 kW Starting Motor (4) to test point (5) with a suitable multimeter. a. Use the multimeter in order to measure the voltage of the starting motor, when you are cranking or attempting to crank the engine. If the starting motor does not crank or cranks slow, perform the following procedure: 1. Perform a visual check of the starting motor and the circuit. Record any appropriate observations. b. If the voltage is equal to or greater than the voltage that is given in table 14 , then the battery and the starting motor cable that goes to the starting motor are within specifications.
Go to step 6. Ensure that all cables and connections are clean and tight. c. The starting motor voltage is less than the voltage specified in table 14 . The voltage drop between the battery and the starting motor is too great. Go to step 5. Ensure that any lead wires are not shorted. 2. Measure the voltage of the battery. Measure the voltage across the battery posts with the multimeter when you are cranking the engine or attempting to crank the engine. Do not measure the voltage across the cable post clamps. 5. Measure the voltage. a. Measure the voltage drops in the cranking circuits with the multimeter. Compare the results with the voltage drops which are allowed in table 15 . a.
If the voltage is equal to or greater than the voltage in table 14 , then go to step 3. b. The battery voltage is less than the voltage in table 14 . Test the battery. Refer to Systems Operation, Testing, and Adjusting, “Battery - Test” for the correct procedure. b. Voltage drops are equal to the voltage drops that are given in table 15 or the voltage drops are less than the voltage drops that are given in table 15 . Go to step 6 in order to check the engine. Note: Low battery voltage can be caused by the condition of the battery or a shorted starting motor. c. The voltage drops are greater than the voltage drops that are given in table 15 .
The faulty component should be repaired or replaced. 3. Measure the current that is sent to the T31 terminal on the starting motor solenoid from the positive post of the battery with a suitable ammeter. The maximum current that flows to the T31 terminal should be equal to 600 amp or the maximum current that flows to the solenoid should be less than 600 amp. 6. Rotate the crankshaft by hand in order to ensure that the crankshaft is not stuck. Check the oil viscosity and any external loads that could affect the engine rotation. a. If the crankshaft is stuck or difficult to turn, repair the engine. If the current is too great, a problem exists in the starting motor. Replace the starting motor.
Note: If the following conditions exist, do not perform the test in step 3 because the starting motor has a problem. b. If the engine is not difficult to turn, go to step 7. 7. Attempt to crank the starting motor. a. The starting motor cranks slowly. The voltage at the battery post is within 2 volts of the lowest value in the applicable temperature range of table 14 . Remove the starting motor for repair or replacement. b. The starting motor does not crank. The large starting motor cables get hot. Check for the blocked engagement of the pinion gear and flywheel ring gear. 4. Measure the starting motor voltage from test point (4) to test point (5) with a suitable multimeter. a.
Use the multimeter in order to measure the voltage of the starting motor, when you are cranking or attempting to crank the engine. Note: Blocked engagement and open solenoid contacts will give the same electrical symptoms. b. If the voltage is equal to or greater than the voltage that is given in table 14 , then the battery