HP3-repair.pdf

DENSO EUROPE TECHNICAL TRAINING

HP3 Supply Pump 

© DENSO EUROPE B.V., 2003

HP3 System Lay-out Supply pump Plungers Feed pump Delivery valve SCV (Suction Control Valve) Common rail Common rail pressure sensor Pressure discharge valve Pressure limiter Injector Engine ECU EDU Various sensors Fuel filter Fuel tank Flow of injection fuel Flow of leak fuel

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Feed Pump HP3 (Trochoid type)

Outer rotor Inner rotor Suction port Discharge port

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Regulating Valve (HP3 Supply pump)

Bushing Piston Spring Plug Feed pump SCV Pump housing

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Suction Control Valve (HP3 Supply pump)

Feed pump

Regulator valve

SCV

When SCV opening is small When SCV opening is large

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HP3 Pump body Construction

Eccentric cam

Ring cam

Plunger

Drive shaft

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Construction & Operation of Delivery Valve

Element

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Check ball

Spring

Holder

Plunger

Supply pump Operation HP3

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Pressure Discharge Valve Common Rail HP3 : from Common rail

: to Fuel tank

Pressure discharge valve

Common rail

Operation when fuel pressure is higher than target injection pressure

Operation when fuel pressure is identical to target injection pressure

© DENSO EUROPE B.V., 2003

DENSO EUROPE TECHNICAL TRAINING

HP3 Supply Pump  Inspection Procedure 

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Fuel line diagram HP3 on Test bench

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ECD Controller set up HP3 on Test bench

(Only HP2)

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DST-1 set up HP3

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DST-1 Test procedure flow HP3

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DST-1 Test procedure HP3

Always input off set data first( From ETSI Website!) Same as HP2.

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DST-1 Test procedure HP3

Always reduce the fuel pressure before stopping the pump!! If not HP3 can be damaged.

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DST-1 Test procedure flow HP3

• At this moment only repairable p/n 294000-001# ( Toyota Hiace/Hilux • Al!ays "hec $T%& 'or latest ersion o' Test speci'ications) • Al!ays test !ith sa'ety coer close*+

© DENSO EUROPE B.V., 2003

© DENSO EUROPE B.V., 2003