: For pin layouts relating to the EGR and exhaust systems, check the Isuzu 4HL1 Engine EGR Guide on Scribd . Isuzu 4HL1 Engine Control Architecture
Used for ITP, common rail pressure, and EGR. isuzu 4hl1 ecu pinout link
Before checking sensor data, verify that the ECU is receiving stable voltage. Pin Function Description Typical Wire Color Reference : For pin layouts relating to the EGR
| | Terminal Name | Terminal at ECM Side | Wire Size (sq) | Wire Type | |---|---|---|---|---| | H1 | Glow Relay | to Glow Relay | 5 | Standard | | D01 | NE Crank pulse GND | E109 | 0.5 | Sealed wire-1 | | D02 | NE Crank pulse OUT | E107 | 0.5 | Sealed wire-1 | | D03 | NE Crank pulse SLD | E108 | 0.75 | Sealed wire-1 | | D04 | NE Crank pulse Vcc | E95 | 0.5 | Sealed wire-2 | | D05 | G (Cam angle) sensor pulse out | E98 | 0.75 | Standard | | D06 | G & Common rail press sensor SLD | E100 | 0.75 | Standard | | D07 | Water temp/Fuel temp sensor GND | E109 | 0.75 | Standard | | D08 | Boost press sensor Vcc | V42 | 0.75 | Standard | | D09 | Oil press sensor Vcc | V80 | 0.75 | Standard | | D10 | Oil press sensor out | V70 | 0.75 | Standard | | D11 | Oil press/Exh temp sensor GND | V79 | 0.75 | Standard | | D12 | Common rail press sensor Vcc | E87 | 0.5 | Sealed wire-3 | | D13 | Common rail press sensor out | E82/E90 | 0.5 | Sealed wire-3 | | D14 | Common rail press sensor GND | E101 | 0.5 | Sealed wire-3 | | D15 | Boost temp sensor | V65 | 0.75 | Standard | | D16 | Boost press sensor Vout | E91 | 0.75 | Standard | | D17 | Boost press sensor GND | V41 | 0.75 | Standard | | D18 | G pulse GND | E101 | 0.5 | Sealed wire-2 | | D19 | G pulse Vcc | E87 | 0.5 | Sealed wire-2 | | E01 | Injector power supply 1 | E121 | 1.25 | Twisted pair-1 | | E02 | Injector power supply 1 | E121 | 1.25 | Twisted pair-2 | | E03 | Injector power supply 2 | E116 | 1.25 | Twisted pair-3 | | E04 | Injector power supply 2 | E116 | 1.25 | Twisted pair-4 | | E05 | OS-INJ1 signal (#1) | E119 | 1.25 | Twisted pair-1 | | E06 | OS-INJ3 signal (4CYL #4) | E117 | 1.25 | Twisted pair-2 | | E07 | OS-INJ2 signal (4CYL #3) | * | 1.25 | Twisted pair-3 | Pin Function Description Typical Wire Color Reference |
Adjusts fuel delivery based on engine warmth (cold start enrichment).