7–113 62-11640
25100 NO COMM FROM MICRO TO STP1
• ACTIVATION: Main microprocessor cannot communicate with stepper valve module over the CAN bus.
• UNIT CONTROL: Engine and Electric Operation: Shut down and alarm. The stepper valve module status
LED may be on steady green (not pulsing) or red.
• RESET CONDITION: Auto reset when CAN communication is restored, alarm reset or alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check both active and inactive alarms for other “ NO COMM” alarms.
a. If more than one alarm, record all and proceed to step 3.
b. If this is the only “NO COMM” alarm, replace module.
2. Check status indicator. Refer to Section 2.5.3
3. Check CAN bus
a. Inspect connector pins & terminals on 1MM and 1SVM. No damaged or corrosion in connections.
b. Check for CAN circuit continuity: CAN Hi; Refer to Section 4.2 CAN Lo; Refer to Section 4.2
If good continuity is not present, check connectors and wiring between terminals for damage,
moisture or corrosion. Repair if required.
4. Check system
Clear active and inactive alarms. Start unit and monitor for additional “NO COMM” alarms.
25100 NO COMM FROM MICRO TO STP1
• ACTIVATION: Main microprocessor cannot communicate with stepper valve module over the CAN bus.
• UNIT CONTROL: Engine and Electric Operation: Shut down and alarm. The stepper valve module status
LED may be on steady green (not pulsing) or red.
• RESET CONDITION: Auto reset when CAN communication is restored, alarm reset or alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check both active and inactive alarms for other “ NO COMM” alarms.
a. If more than one alarm, record all and proceed to step 3.
b. If this is the only “NO COMM” alarm, replace module.
2. Check status indicator. Refer to Section 2.5.3
3. Check CAN bus
a. Inspect connector pins & terminals on 1MM and1SVM. No damaged or corrosion in connections.
b. Check for CAN circuit continuity. CAN Hi: Refer to Section 4.2; CAN Lo: Refer to Section 4.2;
If good continuity is not present, check connectors and wiring between terminals for damage,
moisture or corrosion. Repair if required.
4. Check system
Clear active and inactive alarms. Start unit and monitor for additional “NO COMM” alarms.
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