HINO J05E 2018 Engine P0045 Trouble Code Resolution

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:

1. The Variable Nozzle Turbocharger (VNT) actuator uses a Linear Electric Actuator (LEA) to continuously adjust the nozzle vanes, controlling turbo speed and boost pressure.
2. The LEA contains a sensor that tracks actuator movement and constantly compares the set and actual positions of the nozzle vanes.
3. 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:

1. 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.
2. Judgment Criteria:
   • There’s an open circuit in the motor terminal or coil.

Reset Conditions:

1. 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:

1. Fail-Safe Operation:
   • Reduced engine power due to backup control.
2. Other Symptoms:
   • None noted specifically.

Troubleshooting Process:

Preliminary Inspection:

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

Potential Causes:

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

Post-Inspection Actions:

1. Clear any old DTCs.
2. 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.