Here is the instruction guide on how to solve urea pump reverting valve low malfunction for HINO 600 series.
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Preparations:
1Inspect the DEF pump (reverting valve) connector
Check the connection of the DEF pump connector (Looseness and poor contact).
Was any failure found?
Yes,Connect securely,repair if needed.Perform”After-inspection work”Information section.
No,Go to steps
2 Inspect the DEF pump(reverting valve)unit
1)Set the starter switch to the “LOCK” position.
2)Disconnect the DEF pump connector.
3)Use the electrical tester to measure the resistance between the terminals of the DEF pump (reverting valve).
Do the measurements meet the standard value?
Yes,Go to step3
No,Replace the DEF pump.Per form”After-inspection work” INFORMATION section.
3 Inspect for short-circuit in the DEF pump (reverting valve) harness
Disconnect the DCU 86P connector.
Use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector and the ground.
Do the measurements meet the standard value?
Yes,Go to step 4
No,Repair or replace the harness.Per form”After-inspection work” of INFORMATION section.
4 Inspect disconnection of the DEF pump (reverting valve) harness
1)Connect the DEF pump connector.
2)Connect the signal check harness and use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector.
Do the measurements meet the standard value?
Yes,Go to step 5
No,Repair or replace the harness.Per form”After-inspection work” of INFORMATION section.
5 Check the DTC detected (DCU)
1.Connect the vehicle to HINO DXⅡ.
2.Set the starter switch to the “ON” position.
3.Select [DCU] and check if P20A2 has been detected.
Has DTC P20A2 been detected?
Yes,Replace the DCU. (Perform a DPR forced regeneration after replacement.)
Perform”After-inspection work” of INFORMATION section.
No,Procedure completed.Perform”After-inspection work of INFORMATION section.
More case for HINO please refer to:HINO Trouble Repair.