HINO 600 Series Truck P2048 DEF Injector Low Malfunction Repair

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Here is a illustration show the guide on how to diagnostics and repair for HINO 600 series 15MY DCU Doser 500 malfunction of DEF injector low.

Preparations:

Nexiq USB2 Diagnostic Adapter

2024.03 HINO Diagnostic Explorer DX3/DX2 Diagnostic Software Free Download

HINO Trucks EPC Electronic Parts Catalog 2018 2016 Free Download

Procedures:

Step 1:Inspect for short-circuit in the DEF injector harness

Check the connection of the DEF injector connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.

Perform “After-inspection work” of INFORMATION section

No,go to step2

Step 2:Inspect the DEF injector unit

1.Set the starter switch to the “LOCK” position.

2.Disconnect the DEF injector connector.

3.Use the electrical tester to measure the resistance between the terminals of the DEF injector.

Measuring condition:starter switch lock

Measurement area:DEF injector DML-DMH

Standard value:20°C {68°F}:11.4 – 12.6Ω

Do the measurements meet the standard value?

Yes,go to step 3

No,replace the DEF injector.

Perform “After-inspection work” of INFORMATION section

Step 3:Inspect for short-circuit in the DEF injector harness

1.Disconnect the DCU 86P connector.

2.Connect the signal check harness and use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector and the ground.

Measuring condition:Starter switch: LOCK

Measurement area:DCU 86Pvehicle-side connector,DML- Ground,DMH- Ground

Standard value:∞Ω

Do the measurements meet the standard value?

Yes,go to step4

No,repair or replace the harness.

Perform “After-inspection work” of INFORMATION section

Step 4:Inspect disconnection of the DEF injector harness

1.Connect the DEF injector connector.

2.Connect the signal check harness and use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector.

Measuring condition:Starter switch: LOCK

Measurement area:DCU 86P vehicle-side connector,DML,DMH

Standard value:20°C {68°F}:11.4 – 12.6Ω

Do the measurements meet the standard value?

Yes,go to step5

No,repair or replace the harness.

Perform “After-inspection work” of INFORMATION section

Step 5:Check the DTG detected (DCU)

1.Perform an engine warm-up. (Water temperature: 60 °C {140 °F} or more)

2.Stop the engine and set the starter switch to the “LOCK” position.

3.Connect the vehicle to HINO DXⅡ

4.Set the starter switch to the “ON” position.