Service Manual

7. Troubleshooting10-2019
143A062J683 (Issue 1) Copyright © 2019 Cummins Inc.
3. Verify that both the battery voltage and condition are acceptable. Minimum
voltage for display operation is 8V.
4. Measure battery voltage at the battery while attempting to start from the local or
remote display.
a. Recharge or replace the battery if the voltage drops below 8 VDC.
b. Test and service the generator set battery charger.
5. Check electrolyte level and hydrometer reading in maintenance-type batteries.
a. Replace electrolyte if necessary.
b. Recharge or replace battery if necessary.
6. Measure ATS start signal circuit for open circuit at customer connection TB6.
a. Measure at TB4-1 of the ATS (RA series ATS models) for ground. If there
is no ground, this indicates that the K2 relay is open. Verify if the utility is
present. Replace the relay if necessary.
b. Remove P2 at the generator set control board and measure at P2-4 for
ground. If no ground, isolate the open wiring and repair it.
7. Verify that the P1 and P2 pin sockets are fully inserted and inspect the pin
socket condition for corrosion and acceptable condition of contact wipers. To
check contact wipers, use one of the devices used below:
• A mating pin connector
• A pin gauge the same size as the mating control connector pin (0.045 in)
• Any suitable device that will not damage the inside contact wipers of the
pin socket
If necessary:
• Clean, repair or replace any pin sockets.
• Fully insert any partially inserted pin sockets.
8. Inspect the condition of P1 and P2 pins on the control board. If they are
damaged or severely corroded, clean or repair if possible, or replace the control
board.
9. When reconnecting the harness plug to the connector, ensure that P1 and P2
are fully seated next to each other.
No Response - Fail to Crank
Logic: The control receives a start command but does not crank.
Possible Causes:
• Low or no battery voltage
• Poor battery connection
• Faulty battery
• Open harness connection