Hino P04D6 Fault Code: Exhaust brake mv output short to batt

Hino P04D6 fault code: Exhaust brake mv output short to batt DESCRIPTION OF MALFUNCTION − Exhaust brake magnetic valve is not working properly. − Possible magnetic valve failure or +B short-circuit or disconnection. DTC SET CONDITION DTC Detection Condition: − Exhaust brake inactivity request is in progress. − Starter switch ON. (starter does not operate). − Battery voltage is in the range of 10 V to 16 V. The conditions described above remain for 5 seconds orlonger. Judgment Criteria: − Exhaust brake magnetic valve circuit voltage is 3 V or higher. − Failure determination time: at least 3 seconds 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: Exhaust brake operates at all times (or does not operate when operation request is received). PRE-INSPECTION WORK − Check the trouble diagnostic system and make sure it is okay. − Check the battery voltage and make sure it is okay AFTER-INSPECTION WORK − Clear all past DTCs. − Check that no DTC is detected after test drive. POSSIBLE CAUSES − +B short-circuit or disconnection in exhaust brake drive signal line. − Malfunction of exhaust brake magnetic valve. − Malfunction of engine ECU. INSPECTION PROCEDURE TROUBLESHOOTING STEPS Step 1) Inspect the exhaust brake magnetic valve connector. Check the connection of the exhaust brake magnetic valve connector (Looseness and poor contact) Were any failures found?

Step 2) Inspect the exhaust brake magnetic valve. Check the installation of the exhaust brake magnetic valve. Were any failures found?

Step 3) Inspect the exhaust brake magnetic valve unit.

1. Set the starter switch to the “LOCK” position.
2. Disconnect the exhaust brake magnetic valve connector.
3. Use the electrical tester to measure the resistance between the terminals of the exhaust brake

magnetic valve.

Do the measurements meet the standard value?

Step 4) Inspect for power – circuit of the exhaust brake magnetic valve.

1. Set the starter switch to the “ON” position.
2. Using the electrical tester, measure the pressure between the exhaust brake magnetic valve

vehicle-side connector S0Q terminal and ground.

Step 5) Inspect for short-circuit of the exhaust brake magnetic valve harness.

1. Disconnect the engine ECU connector.
2. Use the electrical tester to measure the resistance between the terminals of the exhaust brake

magnetic valve vehicle-side connector and ground.

Do the measurements meet the standard value?

Step 6) Inspect disconnection of the exhaust brake magnetic valve harness

1. Connect the signal check harness to the engine ECU.
2. Use the electrical tester to measure the resistance between the terminals of the exhaust brake

magnetic valve vehicle-side connector and the engine ECU.

Do the measurements meet the standard value?

Step 7) Check the DTC detected (Engine ECU).

1. Stop the engine and 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 the DTC P04D6 has been detected.

Has DTC P04D5 or P04D6 been detected?

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