Hino P20E0 Fault Code: Aftertreatment fuel injection line pressure sensor signal too high
TECHNICAL DESCRIPTION
The engine ECU detected abnormality in the aftertreatment fuel injection line pressure sensor (Exhaust aftertreatment fuel pressure sensor).
DESCRIPTION OF MALFUNCTION
Malfunction of the aftertreatment fuel injection line pressure sensor and harness +B short circuit are likely to have occurred.
DTC SET CONDITION
DTC Detection Condition:
- Starter switch ON.
- Battery voltage is in the range of 10 V to 16 V.
- The engine is stopped, or the engine revolution remains at 500 r/min or more for at least 5 seconds.
Judgment Criteria:
Output of the aftertreatment fuel injection line pressure sensor remains at 4.54 V (2.02 MPa) or more for at least 3 seconds.
RESET CONDITION
After normal operation is restored.
INDICATION, WARNING OR SYSTEM CONTROL REGULATION WHEN THE DTC IS SET
- MIL: ON
- SVS light: OFF
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
- Abnormality in resistance of the sensor.
- Harness disconnection or short circuit.
- Defective contact and improper fitting of the connector.
- Abnormality in the power supply or internal circuit of the engine ECU sensor.
INSPECTION PROCEDURE
TROUBLESHOOTING STEPS
Step 1) Inspect the aftertreatment fuel injection line pressure sensor connector.
Inspect the aftertreatment fuel injection line pressure sensor connector for improper connection
(improper fitting and detective contact). Were any failures found?
| Yes – Connect securely, repair if needed. Clear all past DTCs. Check that no DTC is detected after test drive. | No – Go to Step 2. |
Step 2) Inspect the aftertreatment fuel injection line pressure sensor.
- Inspect the aftertreatment fuel injection line pressure sensor for improper installation.
- Check the sensing area of the aftertreatment fuel injection line pressure sensor for dirt, clogging, and damage.
Were any failures found?
| Yes – Clean the sensing area and install the sensor properly. If damage is found, replace the sensor. Clear all past DTCs. Check that no DTC is detected after test drive | No – Go to Step 3. |
Step 3) Inspect the aftertreatment fuel injection line pressure sensor wire harness for short circuit.
- Set the starter switch to the “LOCK” position.
- Connect the signal check harness to the engine ECU harness on the vehicle-side. (Do not connect to the ECU).
- Disconnect the connector on the aftertreatment fuel injection line pressure sensor.
- Using the electrical tester, measure the resistance between the terminals of the engine ECU (signal check harness) and ground
| MEASUREMENT CONDITIONS | TESTER CONNECTIONS | STANDARD VALUES |
| Starter switch: LOCK | Engine ECU (signal check harness) FPR(V48) – Ground AVC5(M25) – Ground AGD5(M23) – Ground | ∞ Ω |
Do the measurements meet the standard value?
| Yes – Go to Step 4. | No – Repair or replace the harness. Clear all past DTCs. Check that no DTC is detected after test drive. |
Step 4) Inspect the aftertreatment fuel injection line pressure sensor wire harness for disconnection.
Using the electrical tester, measure the resistance from the engine ECU (signal check harness) to the terminals of the aftertreatment fuel injection line pressure sensor vehicle-side connector.
| MEASUREMENT CONDITIONS | TESTER CONNECTIONS | STANDARD VALUES |
| Starter switch: LOCK | Engine ECU (signal check harness) – Aftertreatment fuel injection line pressure sensor vehicle-side connector FPR(V48) – SIG AVC5(M25) – VCC AGD5(M23) – GND | 1 Ω |
Do the measurements meet the standard value?
| Yes – Go to Step 5. | No – Repair or replace the wire harness. Clear all past DTCs. Check that no DTC is detected after test drive. |
Step 5) Inspect the sensor power supply.
- Set the starter switch to the “ON” position.
- Using the electrical tester, measure the voltage between the terminals of the aftertreatment fuel injection line pressure sensor vehicle-side connector on the vehicle-side.
| MEASUREMENT CONDITIONS | TESTER CONNECTIONS | STANDARD VALUES |
| Starter switch: LOCK | Aftertreatment fuel injection line pressure sensor vehicle-side connector on the vehicle-side VCC – GND | 4.5 – 5.5 V |
Do the measurements meet the standard value?
| Yes – Go to Step 6. | No – Malfunction of engine ECU sensor power supply 2 (Inspect P0653). |
Step 6) Check the DTC detected [Diagnostic Tool].
- Perform engine warm up. (Engine coolant temperature: 80°C {176°F} or more).
- Stop the engine and set the starter switch to the “LOCK” position.
- Connect the vehicle to the diagnostic tool.
- Set the starter switch to the “ON” position.
- On the screen of the diagnostic tool, read the detected DTC.
Has a DTC P20E0 been detected?
| Yes – Replace the aftertreatment fuel injection line pressure sensor. 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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