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:
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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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