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) Two- 3. Disconnect lead 121C from If +12 VDC is present, go to step

cylinder Brake Not Operating, Four-cylinder

line disconnect to center 4. If no voltage is present, repair

Brake Operating Normally - Continued.

cylinders

engine

brake lead 121C.

solenoid valve. Check for +12

VDC at lead 121C.

4. Check for continuity between

If continuity is indicated, notify

contact of center cylinders

direct support maintenance. If no

engine brake solenoid valve

continuity is indicated, repair

and ground.

ground.

Engine Brake Retarder (Jake Brake) Four- 1. Disconnect lead 121B from If +12 VDC is present, go to step

four-cylinder brake switch. 2. If no voltage is present, repair

cylinder Brake Not Operating, Two-cylinder

Brake Operating Normally.

Check for +12 VDC at lead lead 121B.

121B to four-cylinder brake

switch.

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

four-cylinder brake switch. 3. If no voltage is present, repair

Check for +12 VDC at lead lead 121D.

121D to four-cylinder brake

switch.

3. Disconnect lead 121D from If +12 VDC is present, go to step

line disconnect from two- 4. If no voltage is present, repair

cylinder brake switch. Check lead 121D.

for +12 VDC at lead 121D.

4. Disconnect lead 121D from If +12 VDC is present, go to step

line disconnect to rear 5. If no voltage is present, repair

cylinders

engine

brake lead 121D.

solenoid valve. Check for +12

VDC at lead 121D.

5. Check for continuity between

If continuity is indicated, notify

contact or rear cylinders engine

direct support maintenance. If no

brake solenoid valve to ground,

continuity is indicated, repair

and contact of front cylinders

faulty ground.

engine brake solenoid valve to

ground.

0010 00-5