Hino P054F Fault Code: IDLE Fuel Control System (High)
Technical description
Fuel injection quantity is detected unusually high during idling in the engine ECU
Description of malfunction
A difference between a target speed and an actual speed has been detected during idling
DTC set condition
Check Conditions:
Starter switch ON
The conditions described below remain for 10 seconds or longer:
- Accelerator pedal opening = 0% (do not depress the accelerator pedal)
- Engine coolant temperature is 71°C {160°F} or higher
- The target idling speed is within the range of 745 to 755 r/min
- Vehicle speed is 0 mile/h
Judgment Criteria:
Fuel injection quantity remains at 43.5(MT), 52.5(TRANS) mm3/st or higher for 15 seconds or longer
Reset condition
Immediately after normal operation is restored.
Indication, warning or system control
Regulation when the dtc is set
- MIL: ON
- SVS light: OFF
Symptoms on the vehicle when the dtc is set
Symptoms on the Vehicle Due to Malfunction:
- Extremely large load applied to engine while it is idling
- Excessive fuel injection quantity.
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
- Injector injection quantity abnormal
- Dragging/interference with transmission
- Failure in air compressor
- Failure in power steering pump
Inspection procedure
Troubleshooting steps
Step 1: Check the DTC detected [Diagnostic Tool]
- Set the starter switch to the “LOCK” position
- Connect the vehicle to the diagnostic tool
- Set the starter switch to the “ON” position
- Select [Engine] and check if any DTC other than P054F has been detected
Has a DTC other than P054F been detected?
| Yes | Go to the diagnostic procedure of a related DTC |
| No | Go to Step 2 |
Step 2: Check the injector fuel injection quantity [Diagnostic Tool]
- Start the engine
- Select [Injection quantity] from [Data monitor Setting] in the diagnostic tool menu and measure the fuel injection quantity
- Select [Engine speed] from [Data monitor Setting] on the diagnostic tool menu and measure the engine speed
| MEASUREMENT CONDITIONS | STANDARD VALUES |
| Engine speed: 1,500 r/min (no load) Engine coolant temperature: 80°C {176°F} minimum | TRANS model: 12 mm3/st maximum MT model: 10 mm3/st maximum |
Do the measurements meet the standard value?
| Yes | Go to Step 3 |
| No | Replace the injector. Clear all past DTCs. Check that no DTC is detected after test drive |
Step 3: Inspect the air compressor. Check the air compressor for failure
Were any failures found?
| Yes | Repair or replace the faulty part. Clear all past DTCs. Check that no DTC is detected after test drive |
| No | Go to Step 4 |
Step 4: Inspect the power steering pump
Check the power steering pump for failure
Were any failures found?
| Yes | Repair or replace the faulty part. Clear all past DTCs. Check that no DTC is detected after test drive. |
| No | Go to Step 5 |
Step 5: Check the DTC detected [Diagnostic Tool]
- Perform engine warm-up. (Engine coolant temperature: 60°C {140°F} or more)
- Stop the engine and set the starter switch to the “ON” position
- Select [Engine] and check if the DTC P054F has been detected
Has DTC P054F been detected?
| Yes | Replace the engine ECU. Clear all past DTCs. Check that no DTC is detected after test drive. |
| No | Procedure completed. Clear all past DTCs. Check that no DTC is detected after test drive. |
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