Message List Menu SG+

The Message List Menu displays messages. Messages are recorded in the controller memory to simplify unit diagnostic procedures. The messages are listed in the reverse order of their occurrence. Enter the Message List Menu to view the and acknowledge the messages. Acknowledging a message clears it from the list.

Note The unit will not start a PTI until all active messages have been acknowledged. The display will show “ACKNOWLEDGE MESSAGE” if there are messages that have not been acknowledged when trying to start a PTI.

Parent topic: SG+ Operating Instructions

Displaying and Acknowledging Messages

Enter the Message List Menu to view and acknowledge the messages as follows:

  1. Place the On/Off switch in the “ON” position.

  2. Press the ENTER key or the ESCAPE key to enter the Main Menu, if necessary.

  3. Press the UP or DOWN key to scroll up or down through the Main Menu to the Message List Menu.

  4. Press the ENTER key to enter the Message List Menu.

  5. The Message List Menu will appear on the display. It shows the most recent message and the following information:

    • The message code (M101 through M151)

    • The position of the message in the list of recorded messages. For example, 1/1 means message one of one.

    • The message text

    • The message status (Active or Acknowledged).

  6. Write down the message code and the message text.

  7. Press the ENTER key to acknowledge the message. The Alarm LED will continue flashing until the active messages (and alarms) have been acknowledged.

  8. Press the DOWN key to scroll down to the next message, if necessary.

  9. Write down the message code and the message text.

  10. Press the ENTER key to acknowledge the message.

  11. Repeat steps 8 through 10 until all active messages have been written down and acknowledged.

  12. Press the ESCAPE key to return to the Main Menu.

  13. The unit will then enter the Start Sequence and start the engine.

Message List Menu

Message Diagnosis

The Message List on the following pages lists the messages, their causes, and possible diagnosis.

Message List
Message Code Message Text Message Cause Diagnostics
M101 BAT. VOLTAGE LOW The battery voltage is reported to be below 12 voltages for 3 minutes. If the air heater is activated the battery voltage should be below 9 voltage for 3 seconds.

  1. Check battery.

  2. Check battery cables.
M102 DIGITAL INPUT FAILURE Digital inputs have been changing once a second for the last 100 seconds. This condition indicates noise on the line, a loose connection, or a bad sensor.
M103 OUTPUT VOLTAGE < 180 V Exciter field regulation is turned on and voltage measurement is below 360 volts for 30 seconds. Check alternator for low output.
M106 OUTPUT FREQUENCY LOW Output frequency is below 45 Hz for 30 seconds (engine RPM below 1350). Check and adjust engine speed.
M107 OUTPUT FREQUENCY HIGH Output frequency is above 70 Hz for 30 seconds (engine RPM above 2100). Check and adjust engine speed.
M108 LOW OIL LEVEL Oil Level Switch indicates low oil level for 3 minutes.

  1. Check oil level.

  2. Check Oil Level Switch.

  3. Check circuits to Oil Level Switch.
M109 HOUR METER 1 HAS EXCEEDED THRESHOLD Hour Meter 1 (HM1) has exceeded the threshold set in the Configuration Menu. Acknowledge message to reset timer.
M110 HOUR METER 2 HAS EXCEEDED THRESHOLD Hour Meter 2 (HM2) has exceeded the threshold set in the Configuration Menu. Acknowledge message to reset timer.
M111 FUEL LEVEL LOW Fuel Level is below “Fuel Level” set in Configuration Menu.

  1. Check fuel level.

  2. Check Fuel Level Sensor.

  3. Check circuits to Fuel Level Sensor.
M112 ENGINE RPM SENSOR FAILURE Engine speed below 800 RPM and oil pressure high while running or the engine speed is not zero before the starter energizes. Inspect and text engine RPM sensor and wiring.
M114 LOW OIL PRESSURE No oil pressure.

  1. Check oil level.

  2. Check oil pressure using the Engine submenu of the Data Menu.

  3. Check Oil Pressure Switch.

  4. Check Oil Pressure Switch circuit.
M116 COUNTDOWN TIMER HAS EXPIRED If hour counter exceeds user setup. Acknowledge message and reset timer.
M119 WATER TEMPERATURE HIGH If water temp. >107 C for 5 sec. - restarting.

  1. Check water temperature sensor.

  2. Check WTP/WTN circuit.
M121 ENGINE FAILED TO START No oil pressure and did not reach 800 RPM - restarting.

  1. Check fuel level.

  2. Check fuel pump, and fuel system both electrically and mechanically.

  3. In cold ambient temperatures check for fuel gelling.

  4. Check for restricted air cleaner or air intake system.

  5. Check glow plugs.
M122 EXTERNAL OVERLOAD If output is short-circuited - restarting.

  1. Unplug load and attempt restart.

  2. Check alternator field circuit.

  3. Check alternator output circuit.
M123 ENGINE STOPPED REASON UNKNOWN Oil pressure good and no RPM - restarting.

  1. Check fuel level.

  2. Check fuel pump, and fuel system both electrically and mechanically.

  3. In cold ambient temperatures check for fuel gelling.

  4. Check for seized engine or alternator.
M126 FUEL LEVEL SENSOR OUT OF RANGE Fuel level reading is 90 Gallons above then maximum tank size.

  1. Check fuel level sensor.

  2. 2. Check FPOS, FNEG, and FOUT circuits.

  3. Check fuel tank size setting in System Setup submenu.
M127 FUEL LEVEL CHANGE TO FAST Fuel level reading decreased faster than normally expected.
Note Must use password (0007) to clear this message.

  1. Check for leak in fuel tank.

  2. Check to see if fuel has been removed from fuel tank.
M128 SPEED SOLENOID FAILURE The difference between the high and low RPM is measured below 100 RPM. Inspect and text engine speed solenoid and wiring.
M129

RPM BELOW LIMIT

RPM is below 1350 for 5 sec.

  1. Check engine speed.

  2. Check RPM sensor.
M130 DELAYED OUTPUT TIMED OUT Water temperature sensor is below 32 C (90 F) for 5 minutes.

  1. Check water temperature sensor.

  2. Check WTS circuit.
M133 EXCITER CONTROL SHUTDOWN External controller has not responded within 5 sec. See Alternator Diagnosis
M135 ENGINE CONTROL UNIT SHUTDOWN Exciter voltage below 20V. See Alternator Diagnosis
M137 ENGINE AMBER LAMP On for defects that could lead to degraded mode (speed limitation), and for Starter relay defect (because impacting safety) Connect ECU Test Tool to read codes.
M138 ENGINE STOP LAMP On for defects that could lead to engine stop mode. Connect ECU Test Tool to read codes.
M140 DSR CHECKSUM WARNING Regulator running with default parameters. See Alternator Diagnosis
M141 DSR CHECKSUM WARNING Output is short-circuited See Alternator Diagnosis
M142 DSR EXCITATION OVERCURRENT WARNING Exciter current exceeds the damage threshold See Alternator Diagnosis
M143 DSR UNDER OR OVER SPEED WARNING Speed is below or above threshold. See Alternator Diagnosis
M144 DSR OVER CURRENT AND SPEED WARNING Current and speed above limits. See Alternator Diagnosis
M146 OUTPUT VOLTAGE HIGH Output voltage above 500 volts over 15 seconds See Alternator Diagnosis
M148 EXCITER PROTECTION ACTIVATED HRG exciter protection gizmo has been activated See Alternator Diagnosis
M149 COOLANT FAN FAILURE Coolant fan klixon open for 5 seconds

  1. Check coolant fan klixon.

  2. Check circuits to coolant fan klixon.
M150 ENGINE P-CODE INFO Generated for engine P-codes that do not activate any engine lamps. Connect ECU Test Tool to read codes.
M151 TIMING BELT EXPIRED Timing belt needs replacement due to years of operation or engine run hours. Replace engine timing belt.