To Next Page

To Previous Page

11-2

TABLE 11-1. TROUBLESHOOTING GENSET FAULTS

@@@@ Some genset service procedures present hazards that can result in severe personal

injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,

and machinery hazards should perform genset service. See Safety Precautions.

Accidental or remote starting can cause severe personal injury or death. Before removing a panel or

access door, disconnect the negative (–) cable from the battery to prevent the engine from starting.

WARNING

NO RESPONSE AT DIGITAL DISPLAY OR CONTROL SWITCH

Possible Cause: Faulty switch, poor or missing connections, dead battery

Corrective Action: Refer to Pages A-1 through A-3 as appropriate.

1. Push the Emergency Stop Breaker ON if tripped.

2. Try the Digital Display or control switch on the genset (local) if there is no response at a remote Display

or control switch, and vice versa. If at least one control switch or Display works, but not the others, go

to Step 7.

3. If none of the Displays or control switches works, service as necessary by cleaning and tightening bat-

tery connections, recharging or replacing the battery or replacing damaged battery cables (p. 4-2).

4. If there still is no response, disconnect the mate to connector J4 (P1 or P33) in the control box. Check

for battery voltage across pins J4-4 and J4-1 (B+, Display, Start/Stop and ground). If there is voltage,

go to Step 7. If there is no voltage, go to Step 5.

5. Disconnect connector P2 (grey) from the genset controller (p. 9-1) and check for battery voltage across

pin sockets P2-1 and P2-6. If there is voltage, replace the controller. If there is no voltage, go to Step 6.

6. Test the Emergency Stop Breaker (CB1) and replace if necessary (p. 9-5). If there still is no voltage,

check for and repair faulty wiring and connectors between: P2-1 and CB1-1; CB1-2 and B1-BAT; and

P2-6 and GND-ENG.

7. Test for and replace a faulty Display or control switch (p. 9-5) and repair faulty wiring and connectors.

See Page A-1.

THE STARTER ENGAGES AND DISENGAGES

Possible Cause: Low cranking voltage

Corrective Action:

1. Push the genset line circuit breaker OFF.

2. Service the battery as necessary by cleaning and tightening connections, recharging or replacing the

battery or replacing damaged battery cables (p. 4-2).

3. Service the starter (p. 6-11).

Redistribution or publication of this document, 

by any means, is strictly prohibited.

Onan MDKBH Series User Manual

Questions and Answers: