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Guest Message by DevFuse

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Circuit Open Relay location

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1 reply to this topic

  #1 Chad Walton

Chad Walton


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  • Car:Toyota Chaser

Posted 10 September 2017 - 09:48 PM

Ok, so I'm having an issue where after I start my JZX90 Chaser it will die after about 3-4 seconds.  If I rev it sometimes I can get her to stay on, but will not idle if I don't.  I've pulled a 78 code saying "This Relates to Fuel pump control or circuit".  So at first figured it was the fuel pump, however more reading says it could be the fuel pump ecu or the circuit open relay gone bad.  I found a way to bypass the ecu to test if its bad but I don't know where the circuit open relay location is.  Any help?

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  #2 Arthur



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  • Interests:Historic racing - pre and post war cars. Restoring and modifying DIY. <br />Wakefield days with mates - modified 280Z/RB25 and MarkII.<br />Good wine, esp. Durif.
  • Car: 94 JZX90 MarkII TourerV

Posted 20 September 2017 - 09:15 PM

Don't dismiss the coolant temp sensor ECU. The two pin sensor in the return elbow at the front of engine. If open circuit fuel pump cuts. It is there for fuel enrichment when the engine is cold and changes resistance as it comes up to temp. Mine failed and gave similar symptoms.

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