Hino P2228 Fault Code: Barometric Pressure Sensor – Out Of Range (Out Of Range Low)

Description Of Malfunction

The atmospheric pressure sensor (inside the ECU) is not properly functioning.

DTC Set Condition

DTC Detection Condition:

• Starter switch ON.
• Battery voltage is in the range of 10 V to 16 V, and Engine stall, or Engine speed ≥ 500 r/min for 5 seconds.

Judgment Criteria:

• Barometric pressure sensor voltage < 1.9 V (43.3 kPa {6.3 psi}).
• Failure timer ≥ 3 seconds.

Reset Condition

After restoration to normal condition.

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

• MIL: ON
• SVS light: OFF
• Engine output is restricted.

Symptoms On The Vehicle When The DTC Is Set

Symptoms on the vehicle due to backup control (fail safe function)

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

• Malfunction of engine ECU.
• Temporary operating error due to radio wave interference or noise.

Inspection procedure troubleshooting steps

Troubleshooting Steps

Step 1) Check the DTC detected (Engine ECU) 1.

1. Set the starter switch to the “LOCK” position.
2. Connect the vehicle to the diagnostic tool.
3. Set the starter switch to the “ON” position.
4. Select [Engine] and check if any DTC other than P2228 or P2229 has been detected.

Has a DTC other than P2228 or P2229 been detected?

Step 2) Check the DTC detected (Engine ECU) 2.

1. Erase the trouble history.
2. Set the starter switch to the “LOCK” position.
3. Make sure the engine ECU main relay is OFF in the diagnostic tool menu. (This cuts off the communication between the diagnostic tool and the engine ECU).
4. Set the starter switch to the “ON” position.
5. Select [Engine] and check if DTC has been detected.

Has DTC P2228 or P2229 been detected?

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