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Electronic Control Module (ECM)
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 343 PID: S254 SPN: 629 FMI: 12/12 LAMP: Yellow SRT: |
Internal ECM error. |
Possibly none on performance, or severe derate. |
 Electronic Control Module (ECM)
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Circuit Description
The ECM monitors both signal voltage output to the actuators and ECM input from the engine position sensor.
Component Location
The ECM is bolted to the intake side of the cylinder head between the air inlet horn and the front of the engine.
Refer to Procedure 100-002 (Engine Diagrams in Section E for component location.
Shop Talk
- Loose engine or chassis ground connections can cause Fault Code 343 to be logged. Pay special attention to the negative starter post connection.
- Moisture in the ECM connectors can also cause the ECM to log Fault Code 343. Symptoms can include intermittent stumble or rough running.
It is
always a good idea to check the resistance of the meter leads by reading the resistance displayed by the tool when touching the positive and negative leads together. Subtract this reading from any readings taken for resistance. This will provide a more accurate resistance measurement.
Always reapply dielectric grease when reconnecting an electrical connection.
Refer to Troubleshooting Fault Code t05-343.
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