HINO J05E 2018 Engine P0045 Trouble Code Resolution

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Here’s a step-by-step troubleshooting guide to address the P0045 code on a 2018 HINO J05E engine, which indicates an issue with the DC Motor Connector or DC Motor Coil Circuit being open.

Related Contents:

Nexiq USB2 Diagnostic Adapter
HINO Diagnostic Explorer

Technical Overview:

The Variable Nozzle Turbocharger (VNT) actuator uses a Linear Electric Actuator (LEA) to continuously adjust the nozzle vanes, controlling turbo speed and boost pressure.
The LEA contains a sensor that tracks actuator movement and constantly compares the set and actual positions of the nozzle vanes.
A wiping function is performed with the engine off, which helps clean soot and oil from the vanes and checks the turbo’s mechanical operating range.

Fault Description:

No specific fault description.

DTC Setting Conditions:

Detection Criteria:

Ignition is in the “ON” position.
DTC P259F is also present.
Battery voltage ranges between 10-16V.
Engine is either off or running at over 500 rpm for more than 5 seconds.

Judgment Criteria:

There’s an open circuit in the motor terminal or coil.

Reset Conditions:

After the issue is resolved:

MIL (Malfunction Indicator Lamp): ON.
SVS Lamp (Service Vehicle Soon): OFF.
Engine performance is limited until the fault is cleared.

Symptoms if DTC is Active:

Fail-Safe Operation:

Reduced engine power due to backup control.

Other Symptoms:

None noted specifically.

Troubleshooting Process:

Preliminary Inspection:

Check the battery voltage to ensure it’s within the normal operating range (10-16V).

Potential Causes:

Poor contact in the VNT controller connection.
Disconnection within the LEA.
Disconnection within the controller itself.

Post-Inspection Actions:

Clear any old DTCs.
Perform a test drive to confirm the issue is resolved and no new DTCs are present.

Additional Resources:

For other HINO engine troubleshooting cases, consult the HINO Bug Fixes guide.

This guide should help you effectively diagnose and resolve the P0045 error on your 2018 HINO J05E engine.

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