Hino P2048 Fault Code: DEF Injector – Disconnection (Disconnection (Low Side))

Technical Description

• DEF dosing valve is controlled by DCU
• DEF dosing valve detects disconnection and short-circuit based on the circuit voltage and signals in DCU.

Description Of Malfunction

DEF injector failure is detected

Dtc Set Condition

DTC Detection Condition:

• Starter switch ON
• DEF injector duty cycle > 0%

Judgment Criteria:

DEF dosing valve circuit voltage (Low side): Below 0.2 V for more than 0.05 sec

Reset Condition

After having restored to the normal conditions

Indication, Warning Or System Control Regulation When The Dtc Is Set

• MIL: ON
• DEF injection is stopped
• NOx reduction quantity monitoring is aborted

Symptoms On The Vehicle When The DTC Is Set

Symptoms on the Vehicle Due to Backup Control (Fail Safe Function):

Exhaust gas purification function is declined

• Abnormal consumption of DEF solution

Pre-Inspection Work

Check that the battery voltage is in the normal range.

After-Inspection Work

• Clear all past DTCs

• Check that no DTC is stored after test drive

Possible Causes

• Disconnection or short-circuit in sensor harness
• Abnormal resistance of DEF injector
• Malfunction in DEF injector

Inspection Procedure

Troubleshooting Steps

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

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

Were any failures found?

Step 2: Inspect the DEF injector unit

Set the starter switch to the “LOCK” position

Disconnect the DEF injector connector

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

Do the measurements meet the standard value?

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

Do the measurements meet the standard value?

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

Step 5: Check the DTC 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 the diagnostic tool
4. Set the starter switch to the “ON” position
5. Select [DCU] and check if P2048 has been detected

Has DTC P2048 been detected?

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