Hino P208D Fault Code: Def Pump Motor – Circuit (Circuit High)
Technical Description
DCU determines failure of DEF pump motor based on DEF pump circuit voltage.
Description Of Malfunction
Motor malfunction of DEF pump is detected.
Dtc Set Condition Dtc
Detection Condition
– Engine is running.
– DEF pump is operating.
Judgment Criteria:
– DEF pump motor voltage: 2.7 V for 2 sec. or more
– DEF pump is actuating.
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):
NOx reduction function is prevented.
Pre-Inspection Work
Check if the battery voltage is in the normal range.
After-Inspection Work
– Clear all past DTCs.
– Check if no DTC is stored after test drive.
Possible Causes
– Harness disconnection or short-circuit
– Looseness or poor contact of connector
– DEF pump motor malfunction
Inspection Procedure
Troubleshooting Steps
Step 1) Inspect the DEF pump connector..
Check the connection of the DEF pump connector (Looseness and poor contact).
Was any failure found?
| Yes – Connect securely, repair if needed. Clear all past DTCs. Check if no DTC is stored after test drive. | No – Go to Step 2. |
Step 2) Inspect the DCU 86P connector.
Check the connection of the DCU 86P connector (Looseness and poor contact).
Were any failures found?
| Yes – Connect securely, repair if needed. Clear all past DTCs. Check if no DTC is stored after test drive. | No – Go to Step 3. |
Step 3) Check the DEF pump wire harness.
- Set the starter switch to the “LOCK” position.
- Disconnect the DCU 86P connector and the DEF pump connector.
- Connect the signal check harness and use the electrical tester to measure the resistance between the DEF pump and each terminal of the DCU 86P vehicle-side connector.
| MEASUREMENT CONDITIONS | TESTER CONNECTIONS | STANDARD VALUES |
| Starter switch: LOCK | DEF pump vehicle-side connector – DCU 86P vehicle-side connector.
PMP+ – PMP+ PMP- – PMP- PMPS – PMPS |
1 Ω or less |
Do the measurements meet the standard value?
| Yes – Replace the DEF pump and Go to Step 4. | No – Repair or replace the harness. Clear all past DTCs. Check if no DTC is stored after test drive. |
Step 4) Check the DTC detected (DCU).
- Set the starter switch to the “LOCK” position.
- Connect the vehicle to the diagnostic tool.
- Set the starter switch to the “ON” position.
- Select [DCU] and check if P208D has been detected.
Has DTC P208D been detected?
| Yes – Replace the DCU. (After replacing the DCU, perform a DPR forced regeneration.) Clear all past DTCs. Check if no DTC is stored after test drive | No – Procedure completed. Clear all past DTCs. Check if no DTC is stored after test drive. |
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