1998 Isuzu Trooper Logo
Boundless Company Limited Posted on Oct 02, 2010
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Isuzu Big Horn (Trooper) 4JX1 engine.... Vehicle would start and only idle. Some time later it failed to start.. Where do we look for the fault Checked cam sensor and crank. Still need to check ORPS. How does latter function?

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  • Master 642 Answers
  • Posted on Oct 16, 2010
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Sends a signal related to the rail pressure as a voltage to the ECM. 3 wire connector :

  • Red : 5V (Feeds from ECM connector J1-4) Shared with MAP sensor, EGR pressure sensor and accellerator position sensor.(compare values from these sensors and ECM connector)
  • Black : Ground (Feeds from ECM J2-22) Shared with the same sensors mentioned above
  • White : Signal feeds to ECM connector J2-22
Low pressure will set P1194 error code. Oil rail pressure should be more than 3MPa when cranking

Also check Engine coolant temp sensor and wiring. Engine coolant to manifold temp should not differ by more than 5 deg C either way after 8 hours of no operation. I have found the same symptom on these diesels with fuel supply problems. Operate the priming pump (on top of the fuel filter) until it becomes diffycult to push down before starting or checking anything else.

Testimonial: "Thanks Suzman, We actually managed to get it going....The only problem remaining is a rough idle until its warmed up and sometimes stalls until warm. "

  • This is Johngee10 We're having same sort of problem....The tech notes will help me too thanks a lot.

    Very helpfull

    John

  • scanner point
    scanner point Apr 10, 2018

    I have the same problem after fix the injector sleeves o rings. Cranked lot and started with petrol for a few seconds, finally disconnected injector wire socket then scan so I can get ORP sensor and FRP sensor fault code
    Then we have to reconnect the socket. Then it will start. In the beginning it won't accelerate. Have let it run for 10 minutes. Then we can erase the fault code. If engine stop have to do it again.

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