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High Pressure Common Rail (HPCR) Leakage Error
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 329 PID: S233 SPN: 1077 FMI: 14 LAMP: Red SRT: |
High Pressure Common Rail (HPCR) Leakage Error. Rail pressure can not be maintained at maximum pumping capacity. |
Possible stumble, low power, or engine could possibly stall. No effect also possible. |
 High Pressure Common Rail (HPCR) Leakage Error
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Circuit Description
This fault indicates the fuel pressure in the fuel rail pressure is consistently lower than the electronic control module (ECM) is commanding. The electronic fuel control actuator controls how much fuel is delivered to the high-pressure pump. The ECM supplies an electronic current to the fuel control actuator. The electronic fuel control actuator is normally open and is only closed when maximum current is supplied. The high-pressure fuel is accumulated in the fuel rail. The fuel rail pressure sensor measures the fuel pressure and sends a signal to the ECM.
Component Location
The fuel system is located on the air intake side of the engine.
Shop Talk
Inspect the fuel system for external leaks.
Check the low pressure fuel system for restriction and air.
Check the rail pressure sensor.
Check the engine harness.
Check the rail pressure sensor supply voltage.
Check the electronic fuel control actuator.
Check for internal fuel leaks.
Refer to Troubleshooting Fault Code t05-329
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