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External Speed Command Input (Multiple Unit Synchronication) – Data Erratic, Intermittent, or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 237 PID: S030 SPN: 644 FMI: 2 LAMP: Amber SRT: |
External Speed Command Input (Multiple Unit Synchronization) – Data Erratic, Intermittent, or Incorrect. The throttle input signal to the primary or secondary engine for multiple unit synchronization is less than 3 percent or more than 97 percent. |
Primary or secondary engines may be shut down. |
 Multi-Unit synchronization
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Circuit Description
The primary engine broadcasts the engine speed control message over the J1939 datalink to all secondary engines. Jumper wires are used to configure an engine as a primary engine or as a secondary engine. Only
one engine can be configured as the primary engine. Up to five engines can be configured as secondary engines on the same J1939 datalink.
Component Location
The J1939 datalink connections are part of the OEM harness. Location of the J1939 harness will vary by the OEM. Refer to the OEM manual for specific component location.
The configuration of the three pins inputs to the electronic control module (ECM) on the OEM harness determines if an engine is a primary or secondary engine. To activate a pin, the pin must be grounded. To deactivate a pin, the pin must be open circuit.
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Multi-Unit Number 3
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Multi-Unit Number 2
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Multi-Unit Number 1
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Description
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Inactive
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Inactive
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Inactive
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Error Condition
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Inactive
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Inactive
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Active
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Primary
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Inactive
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Active
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Inactive
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Secondary 1
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Inactive
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Active
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Active
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Secondary 2
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Active
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Inactive
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Inactive
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Secondary 3
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Active
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Inactive
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Active
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Secondary 4
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Active
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Active
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Inactive
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Secondary 5
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Active
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Active
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Active
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Error Condition
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Refer to Troubleshooting Fault Code t05-237
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