Solution for 2018 HINO J05E Engine Power Error: DTC P006E

This guide will help you resolve the Diagnostic Trouble Code (DTC) P006E for the 2018 HINO J05E engine, which indicates a power supply issue with the Variable Nozzle Turbocharger (VNT) actuator (out of range, power too low).

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Overview of DTC P006E

The VNT system in the HINO J05E engine regulates turbo speed and boost pressure through the movement of the nozzle blades, which is controlled by the Linear Electric Actuator (LEA). This code is set when the power supply voltage to the VNT actuator is too low, affecting engine performance.

Technical Description

1. VNT Operation: The LEA continuously moves the nozzle blades to control turbocharger speed and boost pressure.
2. LEA Monitoring: The LEA contains a sensor that tracks the movement of the actuator and compares the indicated values with the actual nozzle blade positions.
3. Wiping Operation: This process occurs when the engine is stopped to remove soot and oil buildup from the guide vane area and ensure the turbocharger operates smoothly without mechanical obstructions.

DTC Setting Conditions

Detection Criteria:

1. Ignition Key ON: The DTC is detected when the ignition is switched on.
2. Battery Voltage: The voltage must be within the 10-16 V range.
3. Engine Condition: The engine is either stopped or running at speeds above 500 rpm for at least 5 seconds.

Judgment Criteria:

• Low Power Supply Voltage: The DTC is set if the power supply to the LEA drops below 8 V for more than 6 seconds.

System Response When DTC P006E is Set

1. MIL (Malfunction Indicator Lamp): Turns ON.
2. SVS (Service Vehicle Soon) Light: Remains OFF.
3. Engine Performance: Power is limited due to backup (fail-safe) functions.

Vehicle Symptoms:

• Engine Power Reduction: The fail-safe function will cause a noticeable drop in engine power output.
• No Other Notable Symptoms.

Preliminary Inspection Procedure

1. Check Battery Voltage: Ensure the battery voltage is within the normal operating range (10-16 V). If the voltage is lower than this, there may be an issue with the power supply system.

Possible Causes

1. Defective Power System Components:
   • Faulty generator or voltage regulator.
   • Problems with the wiring or connectors within the power supply system.
2. Battery Issues:
   • Battery charge may be low or the battery may be failing.

Post-Inspection Procedure

1. Clear All DTCs: Use a diagnostic scan tool to erase any stored trouble codes.
2. Test Drive: After clearing the codes, take the vehicle for a test drive and verify that the DTC P006E does not reappear.

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By following these steps, you can diagnose and resolve the P006E error, restoring normal engine performance in the 2018 HINO J05E engine.