OM3017.3 Operation - Section 3 Instrument Panel and Indicator Lights Page 3-23 (30, Figure 3-7) ENGINE CHECK MAIN ("DDEC" Electronic Engine Controls or Cummins Engines Equipped With Centry Fuel Control) (32, Figure 3-7) Battery Check ("DDEC" Electronic-Controlled Engine Only) The battery check indicator light will illuminate if a malfunction is detected in the battery equalizer system. The system should be inspected and repaired as soon as possible. When the keyswitch is turned "On" (before starting engine), this amber "Engine Check Main" indicator light will illuminate for about 2 seconds and then turn off, if no "faults" are detected in the system.
If this indicator remains "On" (or flashes with Cummins Centry Fuel Control system), alert maintenance personnel as soon as possible . (33, Figure 3-7) CIRCUIT BREAKER TRIPPED Detroit Diesel Engines w/DDEC II or III - The amber "Engine Check Main" indicator will illu- minate if a malfunction is detected in the "DDEC" electronic engine control system. If this indicator illuminates, alert maintenance personnel as soon as possible . This light will illuminate if any of the circuit breakers in the relay circuit control boards are tripped. The relay circuit boards are located in the electrical control cabi- net.
Cummins Engines w/Centry Fuel Control - If truck is equipped with a Cummins engine and Centry Fuel Control system, this indicator monitors the Centry fuel system. During engine operation, if a "fault" is detected in the system, the light will turn ON and stay on for "Warning" faults, or it will turn ON and FLASH for more "Severe" faults that can affect engine operation and require immediate attention. (34, Figure 3-7) PARKING BRAKE CONTROL The Parking Brake is for parking only . Truck must be completely stopped before applying parking brake or damage may occur to parking brake components. Parking brake is not designed to stop a moving truck.
Stop truck, then move switch to "ON" to apply parking brake. When the parking brake is applied, Parking Brake indicator (26) will be illuminated on the instru- ment panel. To release, move switch to "OFF". The parking brake is spring applied and hydraulically re- leased; therefore, hydraulic pressure must be available to release park brake. "Warning" faults (light ON) are ones that require attention in the near future, but in most condi- tions will not greatly affect governing perform- ance. "Severe" faults (light FLASHING) are ones that require immediate attention, because Centry governor performance could be significanly af- fected, resulting in a backup mode of opera- tion .
Active fault conditions MUST be corrected as soon as possible . Refer to " (59), Lamp Test/Diagnostic Test Switch " for additional description of this light’s function. (31, Figure 3-7) Engine Check Second ("DDEC II" Electronic-Controlled Engine Only) (35, Figure 3-7) SECONDARY BRAKE CONTROL The Secondary Brake switch (when switched "ON") applies full brake pressure at all four wheels. It should be used ONLY if the service brake treadle is inopera- tive. The amber "Engine Check Second" indicator will illumi- nate if a malfunction is detected in the electronic engine control system. If this indicator illuminates, alert maintenance personnel as soon as possible .