Table 1. Engine Brake Retarder Circuits Troubleshooting Procedures.

TM 9-2320-303-24-1

Table 1. Engine Brake Retarder Circuits Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Engine Brake Retarder (Jake Brake) Not 1. Check engine brake 15A fuse.

Operating, Transmission Lockup Operating

Normally.

2. Disconnect lead 121B from

If +12 VDC is present, repair lead

two-cylinder brake switch.

121B at switch connector. If no

Check for +12 VDC at switch

voltage is present, repair lead

end of lead 121B.

121B at connector 87 on engine

brake lockout relay.

Engine Brake Retarder (Jake Brake) Two- 1. Disconnect lead 121C from

If +12 VDC is present, go to step

cylinder Brake Not Operating, Four-cylinder

two-cylinder brake switch.

2. If no voltage is present, replace

Brake Operating Normally.

Check for +12 VDC at two-

two-cylinder brake switch (WP

cylinder brake switch.

2. Disconnect lead 121C from If +12 VDC is present, go to step

line disconnect from two- 3. If no voltage is present, repair

cylinder brake switch. Check lead 121C.

for +12 VDC at lead 121C.