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Hino P0652 Fault Code: ECU Sensor Power Supply 2 Failure (Out Of Range Low)

06/12/2025

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Technical Description

Power is supplied to the sensor supply 2 circuit. (Accelerator sensor1, common rail pressure sensor (sub), PTO accelerator sensor, differential pressure sensor (exhaust gas pressure sensor).

Description Of Malfunction

Excessively low voltage has been detected in the sensor power supply.

DTC Set Condition

DTC Detection Condition:

Starter switch ON.
Battery voltage is in the range of 10 V to 16 V.

Above conditions continue for at least 5 seconds.

Judgment Criteria:

The AC/DC converter input sensor has a power supply voltage no greater than 3.5 V for at least 3 seconds.

Reset Condition

Immediately after normal operation is restored.

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

MIL: OFF
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

Individual sensors and harnesses (sensor power supply circuit GND short-circuit).
Failure in engine ECU sensor power supply or internal circuit.

Inspection Procedure

Troubleshooting Steps

Step 1) Check the DTC detected 1 (Engine ECU) [Diagnostic Tool].

Connect the vehicle to the diagnostic tool.
Erase the trouble history and set the starter switch to the “LOCK” position.
Disconnect the common rail pressure sensor (sub) connector.
Set the starter switch to the “ON” position.
Select [Engine] and check if P0652 has been detected.

Has DTC P0652 been detected?

Yes – After connecting the connector, go to Step 2.

No – Replace the common rail pressure sensor (sub).

Clear all past DTCs. Check that no DTC is detected after test drive.

Step 2) Check the DTC detected 2 (Engine ECU) [Diagnostic Tool].

Erase the trouble history and set the starter switch to the “LOCK” position.
Disconnect the accelerator sensor 1 connector.
Set the starter switch to the “ON” position.
Select [Engine] and check if P0652 has been detected.

Has DTC P0652 been detected?

Yes – After connecting the connector, go to Step 3.

No – Replace the accelerator sensor 1.

Clear all past DTCs. Check that no DTC is detected after test drive.

Step 3) Check the DTC detected 3 (Engine ECU) [Diagnostic Tool].

Erase the trouble history and set the starter switch to the “LOCK” position.
Disconnect the differential pressure sensor connector.
Set the starter switch to the “ON” position.
Select [Engine] and check if P0652 has been detected.

Has DTC P0652 been detected?

Yes – After connecting the connector, go to Step 4.

No – Replace the differential pressure sensor.

Clear all past DTCs. Check that no DTC is detected after test drive.

Step 4) Check the DTC detected 4 (Engine ECU) [Diagnostic Tool].

Erase the trouble history and set the starter switch to the “LOCK” position.
Disconnect the PTO accelerator sensor connector.
Set the starter switch to the “ON” position.
Select [Engine] and check if P0652 has been detected.

Has DTC P0652 been detected?

Yes – After connecting the connector, go to Step 5.

No – Replace the PTO accelerator sensor.

Clear all past DTCs. Check that no DTC is detected after test drive.

Step 5) Inspect the wire harness of the sensor power supply.

Set the starter switch to the “LOCK” position.
Connect the signal check harness to the engine ECU vehicle-side harness. (Do not connect the harness to the ECU).
Use the electrical tester to measure the resistance between the terminals of the engine ECU (signal check harness).

MEASUREMENT CONDITIONS

TESTER CONNECTIONS

STANDARD VALUES

Starter switch: LOCK

Engine ECU (signal check harness)

AV1(E13) – AG1(E56)

AVC1(V50) – AG1(E56)

AVC3(V71) – AG1(E56)

∞ Ω

Do the measurements meet the standard value?