ENGINE BRAKE WILL NOT OPERATE.

TM 9-2320-279-20-l

Troubleshooting Malfunctions (Cont)

Table 2-9 Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ENGINE BRAKE WILL NOT OPERATE.

Remove circuit breaker compartment cover (para 7-43). Check circuit breaker No.9 for

Step 1.

Replace defective circuit breaker No. 9 (para 7-43).

Check for 24 volts at input terminal on circuit breaker No. 9 (para 7-43).

Step 2.

If 24 volts is not present, trace wiring and find problem. Refer to FO-1, Electrical

Diagram.

Check for loose or broken wires and connections. Refer to FO-1, Electrical Diagram.

Step 3

Tighten loose connections, repair broken wires and connections.

Check engine brake wiring for continuity.

Step 4.

Repair defective wires.

Remove dash side panel, check engine brake ON/OFF switch for continuity.

Step 5.

Replace engine brake ON/OFF switch if defective (para 7-39).

Check engine brake HIGH/LOW switch for continuity.

Step 6.

Replace if defective (para 7-39).

If problem is not solved, notify the supervisor.

Step 7.

2-114.1/(2-114.2 blank)

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