Description of SID 58 – Engine Brake Fault
SID 58 indicates that a fault occurred during operation of the engine brake.
The diagnostic condition is typically:
- Constant Throttle Solenoid Valve Short to Power (058 03)
- Constant Throttle Solenoid Valve Open Circuit (058 05)
- Constant Throttle Solenoid Valve Short to Ground (058 06)
The engine brake function is activated by the constant throttle solenoid valve mounted on the side of the block. See Figure “Location of Constant Throttle Solenoid Valve” .
| 1. Constant Throttle Solenoid Valve | 3. Unit Pumps |
| 2. PLD-MR | 4. Air Compressor |
Figure 1. Location of Constant Throttle Solenoid Valve
The constant throttle solenoid valve is linked to the engine PLD-MR through a 2-pin connector harness attached to the large 55-pin connector harness. See Figure “55- Pin Wiring Harness Connector” . For the four-cylinder MBE 900 engines, air pressure passing through the constant throttle solenoid valve from the adjacent air compressor enables engine braking during engine operation. For the six-cylinder MBE 900 and MBE 4000 engines, oil pressure enables engine braking.
| 1. 55-Pin Connector | |
Figure 2. 55- Pin Wiring Harness Connector
