Hino P016F Fault Code: Fuel system pressure control – low

TECHNICAL DESCRIPTION 

− The common rail pressure is controlled by the discharge of the supply pump.  − The supply pump discharge quantity is adjusted by the SCV (suction control valve).

DESCRIPTION OF MALFUNCTION

Abnormally high fuel pressure inside common rail is detected.

DTC SET CONDITION

DTC Detection Condition:

− Starter switch ON. − Engine speed ≥ 700 r/min. − Fuel injection quantity ≥ 5 mm3/st. cyl. − Fuel injection quantity fluctuation < 78.1 mm3/st. cyl. − Target current value of SCV ≤ 1,970mA. − Target current value of SCV ≤ 1,970mA. The above conditions continue for at least 5 seconds.

Judgment Criteria:

(Actual common rail pressure – target common rail pressure) ≤ -15 MPa for 15 seconds.

RESET CONDITION

After normal operation is restored and the starter switch is on the “LOCK” position.

INDICATION, WARNING OR SYSTEM CONTROL REGULATION WHEN THE DTC IS SET

− MIL: ON − SVS light: OFF − Engine output is restricted. − Cruise control function is not available. − Idling stop system is not available. − Vehicle start control is not available.

SYMPTOMS ON THE VEHICLE WHEN THE DTC IS SET

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

− Engine output is insufficient. − Cruise control does not work. − Idling stop system does not work. − Vehicle start control does not work.

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 detected after test drive.

POSSIBLE CAUSES

− Pre-fuel filter: clogged. − Common rail pressure sensor: faulty contact (power supply fault or GND fault), sensor failure. − Supply pump: SCV fault, learning value fault. − Common rail: pressure limiter valve open. − Harness-related malfunction: faulty contact or wrong connection in crankshaft position sensor (engine speed main sensor) or camshaft position sensor (engine speed sub sensor).

INSPECTION PROCEDURE

TROUBLESHOOTING STEPS

Step 1) Inspect the start of the engine.

Inspect the start of the engine. Did the engine start?

Step 2) Inspect the supply pump.

Check if fuel is leaking or seeping out of the supply pump. Were any failures found?

Step 3) Function check of supply pump [Diagnostic Tool].

1. Connect the vehicle to the diagnostic tool.
2. Set the starter switch to the “ON” position.
3. Select [Engine].
4. Select [Actual common rail pressure] from the [Data monitor setting] menu.
5. Start the engine while checking the common rail pressure.

Were any failures found?

Step 4) Check the engine ECU.

1. Check the engine ECU software part number (ECU part number) by the diagnostic tool.
2. Confirm the latest part number with the OEM. 

Does the engine ECU have the latest software number?

Step 5) Inspect the pre-fuel filter.

1. Inspect the pre-fuel filter.

− Has the replacement period expired? − Is it dirty, damaged, or clogged? − Is it an OEM genuine part?

2. Check if the fuel inside the pre-fuel filter is within the standard value.

Were any failures found?

Step 6) Inspect the fuel pipe.

1. Check if the fuel pipe and hose between the fuel tank and pre-fuel filter are clogged, punctured, or bent.
2. Make sure the fuel pipe joint bolts are not loose.

Were any failures found?

Step 7) Inspect the fuel tank breather.

1. Check if the breather hose is clogged, punctured, or bent.
2. Make sure the check valve is functioning normally.

Were any failures found?

Step 8) Inspect the fuel tank feed pipe.

Make sure the fuel tank feed pipe is not clogged. Were any failures found?

Step 9) Inspect the fuel tank.

Drain fuel out of the fuel tank and check if there are foreign objects inside the tank. Were any failures found?

Step 10) Inspect the supply pump gauze filter.

Make sure the gauze filter (built into the supply pump) is not clogged. Were any failures found?

Step 11) Inspect the fuel high-pressure pipe.

Make sure the fuel high-pressure pipe is not leaking fuel. Were any failures found?

Step 12) Inspect the fuel filter.

Make sure the fuel filter is not clogged. Were any failures found?

Step 13) Inspect the SCV connector.

Check the connection of the SCV connector (Looseness and poor contact). Were any failures found?

Step 14) Inspect the common rail pressure sensor connector.

Check the connection of the common rail pressure sensor connector (Looseness and poor contact). Were any failures found?

Step 15) Inspect the common rail pressure sensor power supply.

1. Disconnect the common rail pressure sensor connector.
2. Set the starter switch to the “ON” position.
3. Use the electrical tester to measure the voltage between the terminals of the common rail pressure sensor vehicle-side connector.

Do the measurements meet the standard value?

Step 16) Inspect the crankshaft position sensor (engine speed main sensor) [Diagnostic Tool].

1. Set the starter switch to the “ON” position.
2. Select [Engine].
3. Select [NE Active identification], [G Active identification] in [Data monitor Setting] menu.
4. Start the engine and confirm that the engine main speed sensor (NE) and sub speed sensor (G) operate (stay ON) continuously.

Were any failures found?

Step 17) Inspect the fuel return pipe and hose.

Check if the fuel return pipe and hose are clogged. Were any failures found?

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