Question about 1998 Isuzu Trooper

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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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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.

Posted on Oct 16, 2010

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

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